1
|
Levi A, Pugsley A, Fernandes MA, Turner GR, Gilboa A. Drawing improves memory in patients with hippocampal damage. Mem Cognit 2024:10.3758/s13421-023-01505-4. [PMID: 38180603 DOI: 10.3758/s13421-023-01505-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/04/2023] [Indexed: 01/06/2024]
Abstract
The hippocampus plays a critical role in the formation of declarative memories, and hippocampal damage leads to significant impairments in new memory formation. Drawing can serve as a form of multi-modal encoding that improves declarative memory performance relative to other multimodal encoding strategies such as writing. We examined whether, and to what extent, patients with hippocampal damage could benefit from the mnemonic strategy of drawing. Three patients with focal hippocampal damage, and one patient with both hippocampal and cortical lesions, in addition to 22 age-, sex-, and education-matched controls, were shown a list of words one at a time during encoding and instructed to either draw a picture or repeatedly write each word for 40 s. Following a brief filled delay, free recall and recognition memory for words from both encoding trial types were assessed. Controls showed enhanced recall and recognition memory for words drawn versus those that were written, an effect that was even more pronounced in patients with focal hippocampal damage. By contrast, the patient with both hippocampal and cortical lesions showed no drawing-mediated boost in either recall or recognition memory. These findings demonstrate that drawing is an effective encoding strategy, likely accruing from the engagement of extra-hippocampal processes including the integration of cortical-based motor, visual, and semantic processing, enabling more elaborative encoding.
Collapse
Affiliation(s)
- A Levi
- Rotman Research Institute at Baycrest Hospital, 3560 Bathurst St., North York, Ontario, M6A 2E1, Canada.
- Department of Psychology, York University, Toronto, Ontario, Canada.
| | - A Pugsley
- Rotman Research Institute at Baycrest Hospital, 3560 Bathurst St., North York, Ontario, M6A 2E1, Canada
- Department of Psychology, York University, Toronto, Ontario, Canada
| | - M A Fernandes
- Department of Psychology, University of Waterloo, Waterloo, Ontario, Canada
| | - G R Turner
- Department of Psychology, York University, Toronto, Ontario, Canada
| | - A Gilboa
- Rotman Research Institute at Baycrest Hospital, 3560 Bathurst St., North York, Ontario, M6A 2E1, Canada.
- Department of Psychology, University of Toronto, Toronto, Ontario, Canada.
- Toronto Rehabilitation Institute, Toronto, Ontario, Canada.
| |
Collapse
|
2
|
van Poelgeest E, Seppala L, Bahat G, Ilhan B, Mair A, van Marum R, Onder G, Ryg J, Fernandes MA, Cherubini A, Denkinger M, Eidam A, Egberts A, Gudmundsson A, Koçak FÖK, Soulis G, Tournoy J, Masud T, Wehling M, van der Velde N. Optimizing pharmacotherapy and deprescribing strategies in older adults living with multimorbidity and polypharmacy: EuGMS SIG on pharmacology position paper. Eur Geriatr Med 2023; 14:1195-1209. [PMID: 37812379 PMCID: PMC10754739 DOI: 10.1007/s41999-023-00872-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Accepted: 09/19/2023] [Indexed: 10/10/2023]
Abstract
Inappropriate polypharmacy is highly prevalent among older adults and presents a significant healthcare concern. Conducting medication reviews and implementing deprescribing strategies in multimorbid older adults with polypharmacy are an inherently complex and challenging task. Recognizing this, the Special Interest Group on Pharmacology of the European Geriatric Medicine Society has compiled evidence on medication review and deprescribing in older adults and has formulated recommendations to enhance appropriate prescribing practices. The current evidence supports the need for a comprehensive and widespread transformation in education, guidelines, research, advocacy, and policy to improve the management of polypharmacy in older individuals. Furthermore, incorporating deprescribing as a routine aspect of care for the ageing population is crucial. We emphasize the importance of involving geriatricians and experts in geriatric pharmacology in driving, and actively participating in this transformative process. By doing so, we can work towards achieving optimal medication use and enhancing the well-being of older adults in the generations to come.
Collapse
Affiliation(s)
- Eveline van Poelgeest
- Section of Geriatric Medicine, Department of Internal Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.
- Aging and Later Life, Amsterdam Public Health Research Institute, Amsterdam, The Netherlands.
| | - Lotta Seppala
- Section of Geriatric Medicine, Department of Internal Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Aging and Later Life, Amsterdam Public Health Research Institute, Amsterdam, The Netherlands
| | - Gülistan Bahat
- Division of Geriatrics, Department of Internal Medicine, Istanbul Medical School, Istanbul University, Capa, Istanbul, Turkey
| | - Birkan Ilhan
- Division of Geriatrics, Department of Internal Medicine, Liv Hospital Vadistanbul, Istanbul, Turkey
| | - Alpana Mair
- Effective Prescribing and Therapeutics, Health and Social Care Directorate, Scottish Government, Edinburgh, Scotland, UK
- Edinburgh Napier University, Edinburgh, UK
| | - Rob van Marum
- Aging and Later Life, Amsterdam Public Health Research Institute, Amsterdam, The Netherlands
- Department of Elderly Care Medicine, Amsterdam University Medical Centers, Location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Graziano Onder
- Fondazione Policlinico Gemelli IRCCS, Rome, Italy
- Università Cattolica del Sacro Cuore, Rome, Italy
| | - Jesper Ryg
- Department of Geriatric Medicine, Odense University Hospital, Odense, Denmark
- Geriatric Research Unit, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Marília Andreia Fernandes
- Department of Internal Medicine, Hospital Curry Cabral, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
| | - Antonio Cherubini
- Geriatria Accettazione geriatrica e Centro di Ricerca per l'invecchiamento IRCCS INRCA, Ancona, Italy
| | - Michael Denkinger
- Agaplesion Bethesda Clinic Ulm, Institute for Geriatric Research, Ulm University, Geriatric Center Ulm, Ulm, Germany
| | - Annette Eidam
- Center for Geriatric Medicine, Heidelberg University Hospital, AGAPLESION Bethanien Hospital Heidelberg, Heidelberg, Germany
| | - Angelique Egberts
- Department of Hospital Pharmacy, Franciscus Gasthuis & Vlietland, Rotterdam, Schiedam, The Netherlands
| | - Aðalsteinn Gudmundsson
- Faculty of Medicine, Landspitali University Hospital, University of Iceland, Reykjavik, Iceland
| | - Fatma Özge Kayhan Koçak
- Division of Geriatrics, Department of Internal Medicine, Faculty of Medicine, Ege University, Izmir, Turkey
| | - George Soulis
- Outpatient Geriatric Assessment Unit, Henry Dunant Hospital Center, Athens, Greece
- Hellenic Open University, Patras, Greece
| | - Jos Tournoy
- Department of Geriatric Medicine, KU Leuven University Hospitals Leuven Gasthuisberg Campus, Leuven, Belgium
- Department of Public Health and Primary Care, KU Leuven Biomedical Sciences Group, Leuven, Belgium
| | - Tahir Masud
- Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Martin Wehling
- Clinical Pharmacology Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Nathalie van der Velde
- Section of Geriatric Medicine, Department of Internal Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Aging and Later Life, Amsterdam Public Health Research Institute, Amsterdam, The Netherlands
| |
Collapse
|
3
|
Vasconcelos RMMAP, Gomes FRAF, Araújo MSC, Parente JGMA, Costa ANB, Parente MTDMA, Fernandes MA, Araújo DC, Gomes YPF, Vasconcelos RMAP. PERFIL IMUNOHEMÁTOLÓGICO DOS DOADORES DE SANGUE DO HEMOCENTRO REGIONAL DE SOBRAL CEARÁ. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
|
4
|
van Poelgeest EP, Seppala LJ, Lee JM, Bahat G, Ilhan B, Lavan AH, Mair A, van Marum RJ, Onder G, Ryg J, Fernandes MA, Garfinkel D, Guðmundsson A, Hartikainen S, Kotsani M, Montero-Errasquín B, Neumann-Podczaska A, Pazan F, Petrovic M, Soulis G, Vankova H, Wehling M, Wieczorowska-Tobis K, van der Velde N. Deprescribing practices, habits and attitudes of geriatricians and geriatricians-in-training across Europe: a large web-based survey. Eur Geriatr Med 2022; 13:1455-1466. [PMID: 36319837 PMCID: PMC9722796 DOI: 10.1007/s41999-022-00702-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 09/26/2022] [Indexed: 11/05/2022]
Abstract
PURPOSE To provide an overview of the current deprescribing attitudes, practices, and approaches of geriatricians and geriatricians-in-training across Europe. METHODS An online survey was disseminated among European geriatricians and geriatricians-in-training. The survey comprised Likert scale and multiple-choice questions on deprescribing approaches and practices, deprescribing education and knowledge, and facilitators/barriers of deprescribing. Responses to the survey questions and participant characteristics were quantified and differences evaluated between geriatricians and geriatricians-in-training and between European regions. RESULTS The 964 respondents (median age 42 years old; 64% female; 21% geriatricians-in-training) were generally willing to deprescribe (98%) and felt confident about deprescribing (85%). Despite differences across European regions, the most commonly reported reasons for deprescribing were functional impairment and occurrence of adverse drug reactions. The most important barriers for deprescribing were patients' unwillingness, fear of negative consequences, lack of time, and poor communication between multiple prescribers. Perceived risk of adverse drug reactions was highest for psychotropic drugs, nonsteroidal anti-inflammatory drugs, cardiovascular drugs, and opioid analgesics. Only one in four respondents (23% of geriatricians and 37% of geriatricians-in-training) think education in medical school had sufficiently prepared them for deprescribing in clinical practice. They reported that their future deprescribing activities would probably increase with improved information sharing between various prescribers, deprescribing recommendations in guidelines, and increased education and training. Approximately 90% think that a paradigm shift is required for prescribers and patients, increasing focus on the possible benefits of deprescribing (potentially) inappropriate medications. CONCLUSIONS Based on the outcomes of this survey, we recommend investing in improved inter-professional communication, better education and evidence-based recommendations to improve future patient-centered deprescribing practices.
Collapse
Affiliation(s)
- Eveline P van Poelgeest
- Department of Internal Medicine Section of Geriatrics, Amsterdam University Medical Centers, Location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands.
- Amsterdam Public Health Research Institute, Aging and Later Life, Amsterdam, The Netherlands.
| | - Lotta J Seppala
- Department of Internal Medicine Section of Geriatrics, Amsterdam University Medical Centers, Location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Amsterdam Public Health Research Institute, Aging and Later Life, Amsterdam, The Netherlands
| | - Jihoo M Lee
- Graduate School of Communication Science, University of Amsterdam, Amsterdam, The Netherlands
| | - Gülistan Bahat
- Division of Geriatrics, Department of Internal Medicine, Istanbul Medical School, Istanbul University, Capa, Istanbul, Turkey
| | - Birkan Ilhan
- Division of Geriatrics, Department of Internal Medicine, Sisli Hamidiye Etfal Training and Research Hospital, University of Medical Sciences, Istanbul, Turkey
| | - Amanda H Lavan
- Mercers Institute of Successful Ageing, St James's Hospital, Dublin, Ireland
- Department of Medical Gerontology, Trinity College Dublin, Dublin, Ireland
| | - Alpana Mair
- Effective Prescribing and Therapeutics, Health and Social Care Directorate, Scottish Government, Edinburgh, Scotland, UK
| | - Rob J van Marum
- Amsterdam Public Health Research Institute, Aging and Later Life, Amsterdam, The Netherlands
- Department of Elderly Care Medicine, Amsterdam University Medical Centers, Location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, Netherlands
| | - Graziano Onder
- Department of Cardiovascular, Endocrine-Metabolic Diseases and Aging, Istituto Superiore di Sanità, Rome, Italy
| | - Jesper Ryg
- Department of Geriatric Medicine, Odense University Hospital, Odense, Denmark
- Geriatric Research Unit, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- Odense Deprescribing Initiative (ODIN), Odense University Hospital and University of Southern Denmark, Odense, Denmark
| | - Marília Andreia Fernandes
- Department of Internal Medicine, Hospital Curry Cabral, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
| | - Doron Garfinkel
- Center for Appropriate Medication Use, Sheba Medical Center and Deputy Head, Homecare Hospice, Israel Cancer Association, 55 Ben Gurion Road, 5932210, Bat, Yam, Israel
| | - Aðalsteinn Guðmundsson
- Landspitali University Hospital, Reykjavik, Iceland
- Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | | | - Marina Kotsani
- Université de Lorraine, CHRU-Nancy, Pôle (Maladies du Vieillissement, Gérontologie et Soins Palliatifs), Nancy, France
| | | | | | - Farhad Pazan
- Clinical Pharmacology Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Mirko Petrovic
- Section of Geriatrics, Department of Internal Medicine and Paediatrics, Ghent University, Ghent, Belgium
| | - George Soulis
- Outpatient Geriatric Assessment Unit, Henry Dunant Hospital Center, Athens, Greece
- Hellenic Open University, Patras, Greece
| | - Hana Vankova
- Cooperatio 34 - Internal Disciplines, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Martin Wehling
- Clinical Pharmacology Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | | | - Nathalie van der Velde
- Department of Internal Medicine Section of Geriatrics, Amsterdam University Medical Centers, Location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Amsterdam Public Health Research Institute, Aging and Later Life, Amsterdam, The Netherlands
| |
Collapse
|
5
|
Alves M, Fernandes MA, Bahat G, Benetos A, Clemente H, Grodzicki T, Martínez-Sellés M, Mattace-Raso F, Rajkumar C, Ungar A, Werner N, Strandberg TE. Protecting older patients with cardiovascular diseases from COVID-19 complications using current medications. Eur Geriatr Med 2021; 12:725-739. [PMID: 34031865 PMCID: PMC8143992 DOI: 10.1007/s41999-021-00504-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Accepted: 04/15/2021] [Indexed: 12/17/2022]
Abstract
PURPOSE In the pathogenesis of severe COVID-19 complications, derangements of renin-angiotensin-aldosterone system (RAAS), vascular endothelial dysfunction leading to inflammation and coagulopathy, and arrhythmias play an important role. Therefore, it is worth considering the use of currently available drugs to protect COVID-19 patients with cardiovascular diseases. METHODS We review the current experience of conventional cardiovascular drugs [angiotensin-converting enzyme (ACE) inhibitors, angiotensin receptor blockers, anticoagulants, acetosalicylic acid, antiarrhythmic drugs, statins] as well as some other drug classes (antidiabetic drugs, vitamin D and NSAIDs) frequently used by older patients with cardiovascular diseases. Data were sought from clinical databases for COVID-19 and appropriate key words. Conclusions and recommendations are based on a consensus among all authors. RESULTS Several cardiovascular drugs have a potential to protect patients with COVID-19, although evidence is largely based on retrospective, observational studies. Despite propensity score adjustments used in many analyses observational studies are not equivalent to randomised controlled trials (RCTs). Ongoing RCTs include treatment with antithrombotics, pulmonary vasodilators, RAAS-related drugs, and colchicine. RCTs in the acute phase of COVID-19 may not, however, recognise the benefits of long term anti-atherogenic therapies, such as statins. CONCLUSIONS Most current cardiovascular drugs can be safely continued during COVID-19. Some drug classes may even be protective. Age-specific data are scarce, though, and conditions which are common in older patients (frailty, comorbidities, polypharmacy) must be individually considered for each drug group.
Collapse
Affiliation(s)
- Mariana Alves
- Faculty of Medicine, Laboratory of Clinical Pharmacology and Therapeutics, Faculdade de Medicina, Serviço de Medicina III, Hospital Pulido Valente, CHULNUniversity of LisbonUniversidade de Lisboa, Lisbon, Portugal
| | - Marília Andreia Fernandes
- Department of Internal Medicine, Hospital Curry Cabral, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
| | - Gülistan Bahat
- Istanbul Medical School, Department of Internal Medicine, Division of Geriatrics, Istanbul University, Capa, 34093, Istanbul, Turkey
| | - Athanase Benetos
- Department of Geriatrics and FHU CARTAGE-PROFILES, CHRU de Nancy and INSERM 1116, Université de Lorraine, Vandoeuvre-lès-Nancy, France
| | - Hugo Clemente
- Department of Geriatrics, Centre Hospitalier de Wallonie Picarde, Tournai, Belgium
| | - Tomasz Grodzicki
- Department of Internal Medicine and Gerontology, Jagiellonian University Medical College, Cracow, Poland
| | - Manuel Martínez-Sellés
- Department of Cardiology, Hospital General Universitario Gregorio Marañón, CIBER-CV. Universidad Europea, Universidad Complutense, Madrid, Spain
| | - Francesco Mattace-Raso
- Division of Geriatrics, Department of Internal Medicine, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | | | - Andrea Ungar
- Department of Geriatrics and Intensive Care Unit, University of Florence and Azienda Ospedaliero Universitaria Careggi, Firenze, Italy
| | - Nikos Werner
- Heart Center Trier, Krankenhaus der Barmherzigen Brüder, Trier, Germany
| | - Timo E Strandberg
- Helsinki University and Helsinki University Hospital, Haartmaninkatu 4, PO Box 340, N00029, Helsinki, Finland.
- University of Oulu, Center for Life Course Health Research, Oulu, Finland.
| |
Collapse
|
6
|
Candeias E, Duarte AI, Sebastião I, Fernandes MA, Plácido AI, Carvalho C, Correia S, Santos RX, Seiça R, Santos MS, Oliveira CR, Moreira PI. Middle-Aged Diabetic Females and Males Present Distinct Susceptibility to Alzheimer Disease-like Pathology. Mol Neurobiol 2016; 54:6471-6489. [PMID: 27730513 DOI: 10.1007/s12035-016-0155-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 09/22/2016] [Indexed: 02/06/2023]
Abstract
Type 2 diabetes (T2D) is a highly concerning public health problem of the twenty-first century. Currently, it is estimated that T2D affects 422 million people worldwide with a rapidly increasing prevalence. During the past two decades, T2D has been widely shown to have a major impact in the brain. This, together with the cognitive decline and increased risk for dementia upon T2D, may arise from the complex interaction between normal brain aging and central insulin signaling dysfunction. Among the several features shared between T2D and some neurodegenerative disorders (e.g., Alzheimer disease (AD)), the impairment of insulin signaling may be a key link. However, these may also involve changes in sex hormones' function and metabolism, ultimately contributing to the different susceptibilities between females and males to some pathologies. For example, female sex has been pointed as a risk factor for AD, particularly after menopause. However, less is known on the underlying molecular mechanisms or even if these changes start during middle-age (perimenopause). From the above, we hypothesized that sex differentially affects hormone-mediated intracellular signaling pathways in T2D brain, ultimately modulating the risk for neurodegenerative conditions. We aimed to evaluate sex-associated alterations in estrogen/insulin-like growth factor-1 (IGF-1)/insulin-related signaling, oxidative stress markers, and AD-like hallmarks in middle-aged control and T2D rat brain cortices. We used brain cortices homogenates obtained from middle-aged (8-month-old) control Wistar and non-obese, spontaneously T2D Goto-Kakizaki (GK) male and female rats. Peripheral characterization of the animal models was done by standard biochemical analyses of blood, plasma, or serum. Steroid sex hormones, oxidative stress markers, and AD-like hallmarks were given by specific ELISA kits and colorimetric techniques, whereas the levels of intracellular signaling proteins were determined by Western blotting. Albeit the high levels of plasma estradiol and progesterone observed in middle-aged control females suggested that they were still under their reproductive phase, some gonadal dysfunction might be already occurring in T2D ones, hence, anticipating their menopause. Moreover, the higher blood and lower brain cholesterol levels in female rats suggested that its dysfunctional uptake into the brain cortex may also hamper peripheral estrogen uptake and/or its local brain steroidogenic metabolism. Despite the massive drop in IGF-1 levels in females' brains, particularly upon T2D, they might have developed some compensatory mechanisms towards the maintenance of estrogen, IGF-1, and insulin receptors function and of the subsequent Akt- and ERK1/2-mediated signaling. These may ultimately delay the deleterious AD-like brain changes (including oxidative damage to lipids and DNA, amyloidogenic processing of amyloid precursor protein and increased tau protein phosphorylation) associated with T2D and/or age (reproductive senescence) in female rats. By demonstrating that differential sex steroid hormone profiles/action may play a pivotal role in brain over T2D progression, the present study reinforces the need to establish sex-specific preventive and/or therapeutic approaches and an appropriate time window for the efficient treatment against T2D and AD.
Collapse
Affiliation(s)
- E Candeias
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal
- Institute for Interdisciplinary Research (IIIUC), University of Coimbra, Casa Costa Alemão - Pólo II, Rua D. Francisco de Lemos, 3030-789, Coimbra, Portugal
| | - A I Duarte
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal.
- Institute for Interdisciplinary Research (IIIUC), University of Coimbra, Casa Costa Alemão - Pólo II, Rua D. Francisco de Lemos, 3030-789, Coimbra, Portugal.
| | - I Sebastião
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal
| | - M A Fernandes
- Life Sciences Department, University of Coimbra, Largo Marquês de Pombal, 3004-517, Coimbra, Portugal
- Instituto do Mar, Life Sciences Department, University of Coimbra, 3004-517, Coimbra, Portugal
| | - A I Plácido
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal
- Faculty of Medicine, University of Coimbra, 3004-504, Coimbra, Portugal
| | - C Carvalho
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal
- Institute for Interdisciplinary Research (IIIUC), University of Coimbra, Casa Costa Alemão - Pólo II, Rua D. Francisco de Lemos, 3030-789, Coimbra, Portugal
| | - S Correia
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal
- Institute for Interdisciplinary Research (IIIUC), University of Coimbra, Casa Costa Alemão - Pólo II, Rua D. Francisco de Lemos, 3030-789, Coimbra, Portugal
| | - R X Santos
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal
- Life Sciences Department, University of Coimbra, Largo Marquês de Pombal, 3004-517, Coimbra, Portugal
| | - R Seiça
- Institute of Physiology, Faculty of Medicine, University of Coimbra, 3004-504, Coimbra, Portugal
| | - M S Santos
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal
- Instituto do Mar, Life Sciences Department, University of Coimbra, 3004-517, Coimbra, Portugal
| | - C R Oliveira
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal
- Institute of Biochemistry, Faculty of Medicine, University of Coimbra, 3004-504, Coimbra, Portugal
| | - P I Moreira
- CNC- Center for Neuroscience and Cell Biology, Rua Larga, Faculty of Medicine (Pólo 1, 1st Floor), University of Coimbra, 3004-517, Coimbra, Portugal.
- Institute of Physiology, Faculty of Medicine, University of Coimbra, 3004-504, Coimbra, Portugal.
| |
Collapse
|
7
|
Peronti ALBG, Fernandes LBR, Fernandes MA. A facultative association between Plebeia droryana (Friese, 1900) (Hymenoptera: Apidae: Meliponini) and a wax scale insect, Ceroplastes janeirensis (Hemiptera: Coccoidea: Coccidae). BRAZ J BIOL 2013; 73:453-4. [PMID: 23917579 DOI: 10.1590/s1519-69842013000200032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 07/19/2012] [Indexed: 11/22/2022] Open
Affiliation(s)
- A L B G Peronti
- Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos – UFSCar, CP 676, CEP 13565-905, São Carlos, SP, Brazil.
| | | | | |
Collapse
|
8
|
Abstract
The transient receptor potential vanilloid 1 and ankyrin 1 (TRPV1 and TRPA1, respectively) channels are members of the TRP superfamily of structurally related, non-selective cation channels. It is rapidly becoming clear that the functions of TRPV1 and TRPA1 interlink with each other to a considerable extent. This is especially clear in relation to pain and neurogenic inflammation where TRPV1 is coexpressed on the vast majority of TRPA1-expressing sensory nerves and both integrate a variety of noxious stimuli. The more recent discovery that both TRPV1 and TRPA1 are expressed on a multitude of non-neuronal sites has led to a plethora of research into possible functions of these receptors. Non-neuronal cells on which TRPV1 and TRPA1 are expressed vary from vascular smooth muscle to keratinocytes and endothelium. This review will discuss the expression, functionality and roles of these non-neuronal TRP channels away from sensory nerves to demonstrate the diverse nature of TRPV1 and TRPA1 in addition to a direct role in pain and neurogenic inflammation.
Collapse
Affiliation(s)
- E S Fernandes
- Cardiovascular Division, School of Medicine, King's College London, London, UK
| | | | | |
Collapse
|
9
|
Morgans GL, Scalzullo SM, Fernandes MA, Michael JP, van Otterlo WAL. 2-{[(4-Methylphenyl)sulfonyl]amino}phenyl 4-methylbenzenesulfonate. Acta Crystallogr C 2007; 63:o309-11. [PMID: 17478920 DOI: 10.1107/s0108270107015430] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2007] [Accepted: 03/29/2007] [Indexed: 11/10/2022] Open
Abstract
The title compound, C(20)H(19)NO(5)S(2), crystallizes as an almost 2:1 mixture of two molecular orientations (described as Orient-A and Orient-B). The consequences of these two orientations is the formation of three types of N-H...O hydrogen-bonded dimers in which the (Orient-A + Orient-A) dimers are likely to be the most stable, while the mixed (Orient-A + Orient-B) dimers are more frequent. Extra interactions in the form of C-H...O and C-H...pi interactions act to further stabilize these dimers and probably allow the less energetically favourable (Orient-A + Orient-B) and (Orient-B + Orient-B) hydrogen-bonded dimers to exist by preventing their conversion to (Orient-A + Orient-A)-only hydrogen-bonded dimers during the crystal-growth process.
Collapse
Affiliation(s)
- G L Morgans
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, PO Wits 2050, Johannesburg, South Africa
| | | | | | | | | |
Collapse
|
10
|
Lötter ANC, Fernandes MA, van Otterlo WAL, de Koning CB. 1-Benzyl-3,3-dichloro-1H-indol-2(3H)-one. Acta Crystallogr C 2007; 63:o157-9. [PMID: 17339719 DOI: 10.1107/s0108270107002028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2006] [Accepted: 01/15/2007] [Indexed: 11/11/2022] Open
Abstract
The title compound, C(15)H(11)Cl(2)NO, was synthesized from N-benzyl isatin. The compound crystallizes as stacks of molecules running down the c axis. Molecules within each of these stacks interact with each other through pi-pi and C-H...pi interactions, and interact with neighbouring stacks through C-H...O interactions.
Collapse
Affiliation(s)
- A N C Lötter
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, PO Wits 2050, Johannesburg, South Africa
| | | | | | | |
Collapse
|
11
|
Sakamoto FH, Colleoni GWB, Teixeira SP, Yamamoto M, Michalany NS, Almeida FA, Chiba AK, Petri V, Fernandes MA, Pombo-de-Oliveira MS. Cutaneous T-cell lymphoma with HTLV-I infection: clinical overlap with adult T-cell leukemia/lymphoma. Int J Dermatol 2006; 45:447-9. [PMID: 16650175 DOI: 10.1111/j.1365-4632.2006.02687.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Adult T-cell leukemia/lymphoma (ATLL) is a malignant proliferation of mature helper T lymphocytes,(1) and is caused by human T-lymphotropic virus type I (HTLV-I);(2) an HTLV-I infection endemic in the Caribbean, south-western Japan, South America and Africa.(3,4) Seroepidemiological studies suggest that it is also endemic in Brazil.(5) Although carriers of HTLV-I show polyclonal integration of virus in T lymphocytes, only patients with ATLL of various subtypes show monoclonal integration of HTLV-I in tumor cells.(6,7) Cutaneous T-cell lymphomas (CTCL) are a group of primary cutaneous lymphoproliferative diseases(8) with unknown etiology.(9) The two most common presentations of CTCL are mycosis fungoides (MF) and Sézary syndrome (SS).(10-13) However, both CTCL categories can easily resemble ATLL. Therefore, in HTLV-I endemic areas, differentiation between ATLL and CTCL must be performed, as they have different prognoses and treatment approaches.(14).
Collapse
Affiliation(s)
- F H Sakamoto
- Department of Dermatology, Discipline of Hematology and Hemotherapy, Universidade Federal de São Paulo -, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Fernandes MA, Smith ML, Logan W, Crawley A, McAndrews MP. Comparing language lateralization determined by dichotic listening and fMRI activation in frontal and temporal lobes in children with epilepsy. Brain Lang 2006; 96:106-14. [PMID: 16083954 DOI: 10.1016/j.bandl.2005.06.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2004] [Revised: 05/19/2005] [Accepted: 06/18/2005] [Indexed: 05/03/2023]
Abstract
We investigated the relationship between ear advantage scores on the Fused Dichotic Words Test (FDWT), and laterality of activation in fMRI using a verb generation paradigm in fourteen children with epilepsy. The magnitude of the laterality index (LI), based on spatial extent and magnitude of activation in classical language areas (BA 44/45, 21/22, 39) differed significantly for patients classified with unilateral left, compared to bilateral, language representation based on FDWT scores. Concordance with fMRI was higher for those classified with unilateral left, than bilateral language representation on the FDWT. Of note, asymmetry in temporal lobe, rather than frontal lobe, activation was more strongly related to the LI from the dichotic listening test. This study shows that the FDWT can provide a quick and valid estimate of lateralization in pre-surgical candidates, which can be readily adopted for other clinical or research purposes when an estimate of language dominance is desired.
Collapse
Affiliation(s)
- M A Fernandes
- Department of Psychology, University of Waterloo, Ont., Canada N2L 3G1.
| | | | | | | | | |
Collapse
|
13
|
Fernandes MA, Levendis DC. Photodimerization of the α′-polymorph of ortho-ethoxy-trans-cinnamic acid in the solid state. I. Monitoring the reaction at 293 K. Acta Crystallogr B Struct Sci 2004; 60:315-24. [PMID: 15148435 DOI: 10.1107/s0108768104007955] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2004] [Accepted: 04/01/2004] [Indexed: 11/10/2022]
Abstract
Structural changes that occur during the [2 + 2] photodimerization of the metastable α′-polymorph of ortho-ethoxy-trans-cinnamic acid at 293 K are presented here. Crystals of the α′-polymorph were first stabilized by exposing the α-polymorph to UV light for a short period of time at 343 K. The photodimerization reaction was then carried out at 293 K and observed in situ by single-crystal X-ray diffraction. The α′-polymorph contains three molecules in the asymmetric unit, labelled A, B and C, which are arranged to form two potential reaction sites. The intermolecular distance between the C=C bonds of molecules A and B (making up the AB site) is 3.6 Å, and these were observed to undergo photodimerization at 293 K. The corresponding distance between centrosymmetrically related C=C bonds in the CC site (made up of C molecules) is 4.6 Å, and these remain unreacted even after 60 h irradiation at 293 K. The crystal of the final product, which corresponds to a 66.7% conversion (only two out of three molecules in the asymmetric unit take part in the photodimerization reaction at 293 K), contains an ordered arrangement of the photodimer and unreacted monomer. The crystal retains many structural features of the original monomer crystal, including carboxylic acid hydrogen bonds and C—H...O interactions. Single-crystal X-ray diffraction was used to monitor changes in the unit-cell parameters, reacting molecules and molecular conformations as the reaction progressed. The conformation of the photodimer obtained from the solid-state reaction differs from that of the photodimer obtained by recrystallization from solution.
Collapse
Affiliation(s)
- M A Fernandes
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO WITS, 2050 Johannesburg, South Africa.
| | | |
Collapse
|
14
|
Aranha F, Gomes R, Rutherford C, Rouge A, Alves S, Oliveira M, Campos L, Fernandes M, Nogueira P, Dohmann H. Crit Care 2003; 7:P86. [DOI: 10.1186/cc2282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
15
|
Dohman H, Perin E, Sousa A, Silva S, Tinoco C, Esporcatte R, Rangel F, Campos L, Fernandes M, Dohmann H. Crit Care 2003; 7:P12. [DOI: 10.1186/cc2208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
16
|
Gomes R, Aranha F, Campos L, Fernandes M, Nogueira P, Nunes E, Sabino J, Carvalho A, Farina R, Dohmann H. Crit Care 2002; 6:P241. [DOI: 10.1186/cc1709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
17
|
Gomes R, Aranha F, Mendonça H, Campos L, Tura B, Fernandes M, Nogueira P, Vegni R, Silva D, Dohmann H. Crit Care 2002; 6:P243. [DOI: 10.1186/cc1711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
18
|
Mendonça F° H, Campos L, Gomes R, Fernandes M, Nogueira P, Sabino J, Aranha F, Silva F° D, Farina R, Dohmann H. Crit Care 2001; 5:P51. [DOI: 10.1186/cc1384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
19
|
Aranha F, Gomes R, Pinto J, Campos L, Fernandes M, Nogueira P, Azevedo F° C, Vegni R, Carvalho A, Dohmann H. Crit Care 2001; 5:P15. [DOI: 10.1186/cc1348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
20
|
|
21
|
|
22
|
Gomes R, Tura B, Campos L, Fernandes M, Nogueira P, Nunes E, Mendonça F° H, Aranha F, Carvalho A, Dohmann H. Crit Care 2001; 5:P88. [DOI: 10.1186/cc1421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
23
|
Azevedo F° CF, Aranha FG, Gomes RV, Campos LA, Fernandes MA, Nogueira PM, Dornelles AP, Mendonça F° HTF, Sabino J, Dohmann HF. Early experience of intensive postoperative unit (IPU): percutaneous tracheotomy as the first option after long-term oro-tracheal intubation. Crit Care 2001. [PMCID: PMC3300997 DOI: 10.1186/cc1430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- CF Azevedo F°
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - FG Aranha
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - RV Gomes
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - LA Campos
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - MA Fernandes
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - PM Nogueira
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - AP Dornelles
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - HTF Mendonça F°
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - J Sabino
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| | - HF Dohmann
- Hospital Pró-Cardíaco, Surgical Intensive Care Unit, PROCEP, Rio de Janeiro, Brazil
| |
Collapse
|
24
|
Porto A, Morgado J, Bitencourt M, Gomes R, Campos L, Fernandes M, Nogueira P, Silva S, Rey H, Dohmann H. Crit Care 2001; 5:P11. [DOI: 10.1186/cc1344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
25
|
Abstract
In 5 divided attention (DA) experiments, students (24 in each experiment) performed visual distracting tasks (e.g., recognition of words, word and digit monitoring) while either simultaneously encoding an auditory word list or engaging in oral free recall of the target word list. DA during retrieval, using either of the word-based distracting tasks, produced relatively larger interference effects than the digit-monitoring task. DA during encoding produced uniformly large interference effects, regardless of the type of distracting task. Results suggest that when attention is divided at retrieval, interference is created only when the memory and concurrent task compete for access to word-specific representational systems; no such specificity is necessary to create interference at encoding. During encoding, memory and concurrent tasks compete primarily for general resources, whereas during retrieval, they compete primarily for representational systems.
Collapse
Affiliation(s)
- M A Fernandes
- Department of Psychology, University of Toronto at Mississauga, Ontario, Canada.
| | | |
Collapse
|
26
|
Abstract
The validity of the Fused Dichotic Words Test (FDWT) in predicting the nature of speech representation, as determined by the Intracarotid Amobarbital Procedure (IAP), was examined in a sample of 28 children with epilepsy. Various methods of analysis (difference score, lambda, and lambda(*)), for the FDWT data were calculated and compared. Results showed the validity of the FDWT did not change depending on the method of analysis. The difference scores showed that 18 of the 19 patients with left hemisphere speech obtained right-ear advantages, while the patient with right hemisphere speech showed a left-ear advantage. As a group, patients with left-hemisphere speech obtained a statistically significant right-ear advantage for the lambda and lambda(*) indices, while the patient with right-hemisphere speech showed a left-ear advantage that was also significant for both lambda measures. Patients with bilateral speech, as a group, displayed a non-significant ear advantage. Some of the scores from the left-hemisphere group overlapped with those from patients with bilateral speech representation. Controlling for stimulus dominance effects using the lambda(*) measure did not improve classification accuracy for nature of speech representation based on FDWT scores. Finally, comparison of our data using the laterality index from a similar study, showed scores smaller in magnitude than that found in adults with epilepsy.
Collapse
Affiliation(s)
- M A Fernandes
- Department of Psychology, University of Toronto at Mississauga, 3359 Mississauga Road North, Mississauga, Ontario, L5L 1C6, Canada.
| | | |
Collapse
|
27
|
Fernandes MA, Geraldes CF, Oliveira CR, Alpoim MC. Effects of NADH and H(2)O(2) on chromate-induced human erythrocytes hemoglobin oxidation and peroxidation. Ecotoxicol Environ Saf 2000; 47:39-42. [PMID: 10993701 DOI: 10.1006/eesa.1999.1939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The effects of NADH and H(2)O(2) on chromate-induced human erythrocyte hemoglobin oxidation and peroxidation were studied. It was observed that NADH decreases the levels of chromate-induced human erythrocyte hemoglobin oxidation and peroxidation. H(2)O(2) decreases the levels of chromate-induced hemoglobin oxidation, but increases the levels of chromate-induced peroxidation. The ability of H(2)O(2) to decrease the levels of chromate-induced hemoglobin oxidation is higher than that observed for NADH. Furthermore, H(2)O(2) increases the inhibitory effect of NADH on chromate-induced hemoglobin oxidation, but decreases the NADH effect on chromate-induced peroxidation. The meaning of these results is discussed in terms of involvement of reactive chromium(V) species and reactive oxygen species in the mechanism by which chromate induces its effects in human erythrocytes.
Collapse
Affiliation(s)
- M A Fernandes
- Departamento de Zoologia, Universidade de Coimbra, Coimbra, 3004-517, Portugal
| | | | | | | |
Collapse
|
28
|
Colleoni GW, Oliveira JS, Borducchi DM, Fernandes MA, Da Silva HT, Alves AC, De Franco MF, Kerbauy J, Pestana JO. Post-transplant lymphoproliferative disorders (PTLD) after renal transplantation: management and evolution of seven cases among 1002 renal transplants in São Paulo, Brazil. Leuk Lymphoma 2000; 39:145-50. [PMID: 10975393 DOI: 10.3109/10428190009053548] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We reported seven cases (0.7%) of PTLD among 1002 renal transplants performed at Renal Transplant Service from Hospital São Paulo-Universidade Federal de São Paulo/Escola Paulista de Medicina, São Paulo, Brazil, between 1976 and 1997. There were three male and four female patients with median age of 37 year-old. According to Ann Arbor staging system there were four localized extra-nodal intermediate-grade NHL, one disseminated low-grade NHL and two polyclonal lymphoid hyperplasia. Four patients received cadaveric, two received related and one received unrelated renal transplant. PTLD occurred after a median latency period of 36 months (ranging from 5 to 84 months). In situ hybridization for EBER1 was performed in five patients and molecular evidence of EBV was found in 3 cases (two DLCL and one lymphoplasmocytoid lymphoma). All patients were treated with immunosuppression withdrawal, four patients received anthracyclin-based chemotherapy for control of localized or systemic clonal disease and three were treated with resection of primary PTLD. Four of seven patients (57%) are in complete remission 11, 20, 25 and 79 months after PTLD onset. One patient lost follow-up and two patients died due to lymphoma relapse, respectively 4 and 10 months after completion of treatment. In conclusion, our experience with this small group of patients showed that: 1) immunosuppression withdrawal is not necessarily associated with loss of renal transplant and can be used as the only treatment for polyclonal PTLD; 2) chemotherapy can simultaneously lead to clonal PTLD remission and periodic immunosuppression, avoiding graft rejection after immunosuppression withdrawal.
Collapse
Affiliation(s)
- G W Colleoni
- Hematology and Transfusion Service, Escola Paulista de Medicina-Universidade Federal de São Paulo, Brazil
| | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Fernandes MA, Smith ML. Controlling for stimulus dominance effects in the Fused Dichotic Words Test when predicting speech lateralization in children. Brain Cogn 2000; 43:191-5. [PMID: 10857692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
A log-linear analysis (Grimshaw et al., 1994) of Fused Dichotic Words Test data was examined in a sample of 28 children with epilepsy who had undergone the intracarotid amobarbital procedure to determine the nature of speech representation. The analysis yields a measure of ear dominance (lambda*) that controls for stimulus dominance confounds. Most patients with unilateral speech obtained statistically significant ear advantages, whereas most with bilateral speech displayed no significant ear advantage. Despite controlling for stimulus dominance confounds, some of the scores from patients with left-hemisphere speech overlapped with those from patients with bilateral speech representation.
Collapse
|
30
|
Abstract
In 5 divided attention (DA) experiments, students (24 in each experiment) performed visual distracting tasks (e.g., recognition of words, word and digit monitoring) while either simultaneously encoding an auditory word list or engaging in oral free recall of the target word list. DA during retrieval, using either of the word-based distracting tasks, produced relatively larger interference effects than the digit-monitoring task. DA during encoding produced uniformly large interference effects, regardless of the type of distracting task. Results suggest that when attention is divided at retrieval, interference is created only when the memory and concurrent task compete for access to word-specific representational systems; no such specificity is necessary to create interference at encoding. During encoding, memory and concurrent tasks compete primarily for general resources, whereas during retrieval, they compete primarily for representational systems.
Collapse
Affiliation(s)
- M A Fernandes
- Department of Psychology, University of Toronto at Mississauga, Ontario, Canada.
| | | |
Collapse
|
31
|
Fernandes MA, Geraldes CF, Oliveira CR, Alpoim MC. Chromate-induced human erythrocytes haemoglobin oxidation and peroxidation: influence of vitamin E, vitamin C, salicylate, deferoxamine, and N-ethylmaleimide. Toxicol Lett 2000; 114:237-43. [PMID: 10713489 DOI: 10.1016/s0378-4274(00)00167-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In order to attenuate or to prevent chromate-induced human erythrocytes injury, the influence of vitamin E, vitamin C, salicylate, deferoxamine, and N-ethylmaleimide on chromate-induced human erythrocytes haemoglobin oxidation and peroxidation were investigated. It was observed that pretreatment of human erythrocytes with vitamin E (20 microM), vitamin C (1 mM), salicylate (3 mM), and deferoxamine (4 mM) significantly increased (P=0.0001) chromate-induced human erythrocytes haemoglobin oxidation in a time dependent manner, while it was significantly decreased (P=0.0001) by pretreatment with N-ethylmaleimide (1 mM). In contrast, pretreatment of human erythrocytes with deferoxamine (4 mM) immediately inhibited (P=0.0001) chromate-induced human erythrocytes peroxidation, while it was significantly increased (P=0.0001) by pretreatment with N-ethylmaleimide (1 mM) during the first 4 h of cells exposition to chromate. For time periods superior to 6 h pretreatment with N-ethylmaleimide (1 mM) significantly decreased (P=0.0001) chromate-induced human erythrocytes peroxidation. It was concluded that care must be taken as these drugs are used to prevent against toxicity induced by chromium(VI) compounds.
Collapse
Affiliation(s)
- M A Fernandes
- Departamento de Zoologia, Faculdade de Ciências, Universidade de Coimbra, 3004-517, Coimbra, Portugal
| | | | | | | |
Collapse
|
32
|
Fernandes MA, Furuse CF, Pelissaro GS, Biazolla ER, Correa C, Conrado Neto S. Brachytherapy using gold-198 foils in treatment of mouth tumors: case report. Oral Oncol 1999; 35:607-8. [PMID: 10705097 DOI: 10.1016/s1368-8375(99)00030-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The authors presents a clinical case treated with brachytherapy performed with special mold of gold-198 disc, with the purpose of evaluating the distribution of radiation dose, the viability of manufacturing the radioactivity prosthesis and its operational cost. In despite of being only one case, we can conclude that the prosthesis with gold-198 foils can be manufactured in acrylic with thickness thinner than those ones with cylinder of cesium-137, resulting lower operational costs, besides permitting better distribution of radiation dose on the lesion.
Collapse
Affiliation(s)
- M A Fernandes
- Radiotherapy Center of Sagrado Coração de Jesus Hospital, Araçatuba, Brazil
| | | | | | | | | | | |
Collapse
|
33
|
Fernandes MA, Oliveira CR, Oliveira LM, Nogueira AJ, Santiago B, Santana I. Apolipoprotein E epsilon4 allele is a risk factor for Alzheimer's disease: the central region of portugal (Coimbra) as a case study. Eur Neurol 1999; 42:183-4. [PMID: 10529548 DOI: 10.1159/000008098] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- M A Fernandes
- Centro de Neurosciências de Coimbra, Hospital da Universidade de Coimbra, Portugal
| | | | | | | | | | | |
Collapse
|
34
|
Fernandes MA, Proenca MT, Nogueira AJ, Grazina MM, Oliveira LM, Fernandes AI, Santiago B, Santana I, Oliveira CR. Influence of apolipoprotein E genotype on blood redox status of Alzheimer's disease patients. Int J Mol Med 1999; 4:179-86. [PMID: 10402486 DOI: 10.3892/ijmm.4.2.179] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The blood redox status of probable Alzheimer's Disease (AD) patients and control subjects with distinct Apo E genotypes was investigated. It was assessed by measuring the levels of hydroperoxides (MDA) in plasma and erythrocytes, the levels of the antioxidant defense system (enzymatic and non-enzymatic) in plasma, erythrocytes, platelets and leukocytes, the activities of catechol-O-methyltransferase (COMT) in erythrocytes and monoamine oxidase-B (MAO-B) in platelets and also the activity of the mitochondrial respiratory chain in leukocytes. No significant differences were found between the Apo E genotype and MDA, uric acid, vitamin E and reduced-glutathione (GSH) levels in plasma; MDA, vitamin E, GSH, superoxide-dismutase (SOD), glutathione-peroxidase (GSH-Px) and COMT levels in erythrocytes; vitamin E levels in the platelets of AD patients and control subjects. However, the uric acid levels in plasma and the COMT levels in erythrocytes of AD patients and control subjects with the epsilon4 allele were significantly lower than those observed in control subjects without the epsilon4 allele. Moreover, the duraquinol oxidation level in leukocytes of AD patients with the epsilon4 allele was significantly higher than that in AD patients without the epsilon4 allele and control subjects with and without the epsilon4 allele. The meaning of these results is discussed in terms of involvement of oxidative stress in the etiopathogenesis of AD.
Collapse
Affiliation(s)
- M A Fernandes
- Departamento de Zoologia, Universidade de Coimbra, 3000 Coimbra, Portugal
| | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Fernandes MA, Proença MT, Nogueira AJ, Oliveira LM, Santiago B, Santana I, Oliveira CR. Effects of apolipoprotein E genotype on blood lipid composition and membrane platelet fluidity in Alzheimer's disease. Biochim Biophys Acta 1999; 1454:89-96. [PMID: 10354518 DOI: 10.1016/s0925-4439(99)00030-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The blood lipid composition (plasma, platelets and leukocytes), platelet membrane fluidity, apolipoproteins A and B in the plasma of AD patients and control subjects with distinct Apo E genotypes were investigated. No significant differences were found between the Apo E genotype and the cholesterol, phospholipids, triglycerides and Apo B levels in the plasma; cholesterol and phospholipids levels in platelet and leukocyte membranes; and platelet membrane fluidity of AD and control groups. However, the phospholipid levels in the leukocyte membranes of the control subgroup with the genotypes epsilon3/epsilon3 and epsilon3/epsilon4 and the AD subgroups with the genotypes epsilon2/epsilon3 and epsilon3/epsilon3, epsilon3/epsilon4 and epsilon4/epsilon4 were significantly lower than those observed in the control subgroup with the genotype epsilon2/epsilon3. Moreover, the cholesterol and phospholipid levels in the platelet membranes of the AD subgroup with the epsilon2 allele were significantly higher than those in the AD subgroup without the epsilon2 allele and the control subgroups with and without the epsilon2 allele. A strong correlation was found between cholesterol and phospholipids levels in the platelet membranes of the AD and control subgroups without the epsilon2 allele, but the residual cholesterol level in the platelet membranes of the AD subgroup was twice that observed in the control subgroup. Furthermore, the Apo A levels in the plasma of the AD subgroup with the epsilon3 allele were significantly lower than those observed in the AD subgroup without the epsilon3 allele and the control subgroup with the epsilon3 allele. The results are discussed in terms of involvement of lipid metabolism in the etiopathogenesis of AD.
Collapse
Affiliation(s)
- M A Fernandes
- Departamento de Zoologia, Universidade de Coimbra, 3000, Coimbra, Portugal
| | | | | | | | | | | | | |
Collapse
|
36
|
Fernandes MA, Mota IM, Silva MT, Oliveira CR, Geraldes CF, Alpoim MC. Human erythrocytes are protected against chromate-induced peroxidation. Ecotoxicol Environ Saf 1999; 43:38-46. [PMID: 10330319 DOI: 10.1006/eesa.1998.1755] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In previous studies performed in this laboratory it was realized that in a broad concentration range (0.5-8 mM) dichromate does not induced red blood cell (RBC) peroxidation. To investigate the reasons behind RBC protection against chromate-induced peroxidation, the effects of 8 mM dichromate on white ghost and RBC peroxidation, RBC antioxidant system and hemoglobin status, as well as RBC osmotic fragility and morphology, were studied in more detail. It was observed that the peroxidation level induced by dichromate on RBCs is practically negligible when compared with the peroxidation induced in white ghosts. Furthermore, the osmotic fragility of RBCs exposed to dichromate is not altered, but the cells undergo echinocytic transformation, probably due to chromate-induced structural RBC membrane modifications. The activities of catalase, gluthatione peroxidase, and superoxide dismutase of RBCs exposed to dichromate were similar to those observed in controls, but the gluthatione reductase and GSH levels were significantly reduced (P<0. 05). Concomitantly, GSSG and methemoglobin levels increased and NADH-methemoglobin reductase activity decreased. These results indicate that chromate does not induce RBC peroxidation, but does promote echinocytic shape transformation, oxidation of hemoglobin and GSH, and inhibition of gluthatione reductase and methemoglobin reductase. The enzymatic antioxidant defense system and hemoglobin oxidation are probably involved in the mechanism of RBC proctection against chromate-induced peroxidation, as is discussed.
Collapse
Affiliation(s)
- M A Fernandes
- Faculdade de Ciências e Tecnologia, Universidade de Coimbra, Coimbra, 3000, Portugal
| | | | | | | | | | | |
Collapse
|
37
|
Fernandes MA, Proença MT, Nogueira AJ, Oliveira LM, Santiago B, Santana I, Oliveira CR. Apolipoprotein E genotype has no effect on the free intracellular Ca2+ concentration of platelets from Alzheimer's disease patients. Int J Mol Med 1999; 3:431-4. [PMID: 10085419 DOI: 10.3892/ijmm.3.4.431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The free intracellular Ca2+ concentration [Ca2+]i of platelets was investigated in Alzheimer's disease (AD) patients and age-matched control subjects with distinct Apo E genotypes. No significant differences were found between the Apo E genotype and the [Ca2+]i levels of platelets (basal and alpha-thrombin stimulated) from AD patients and age-matched control subjects, suggesting that [Ca2+]i homeostasis of platelets from AD patients is independent of the Apo E genotype. The results are discussed in terms of involvement of Apo E and [Ca2+]i changes in the etiopathogenesis of AD.
Collapse
Affiliation(s)
- M A Fernandes
- Departamento de Zoologia, Centro de Neurosciências de Coimbra, Universidadede Coimbra, 3000 Coimbra, Portugal
| | | | | | | | | | | | | |
Collapse
|
38
|
Chiaravalloti Neto F, de Moraes MS, Fernandes MA. [Results of activities encouraging community participation in dengue control in an outlying neighborhood of São José do Rio Preto, São Paulo, and the relationship between the population's knowledge and habits]. CAD SAUDE PUBLICA 1998; 14 Suppl 2:101-9. [PMID: 9700229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
This study evaluates the results of an educational campaign developed in an outlying neighborhood of São José do Rio Preto, São Paulo, and the relationship between the population's knowledge and habits. Prior to and after the educational activities, samples were taken to measure level of knowledge concerning dengue and its vectors, breeding sites, and control measures. Potential breeding sites were also counted. Knowledge of the disease and its vectors and breeding sites increased, but the same was not true for control measures focusing on water recipients serving as potential breeding sites. There was no change in the number of breeding sites between the first and second stages of the research. Thus, despite increased knowledge, the local population's habits did not changes. These findings are worrisome, since the main goal of the educational campaign, i.e., the change of habits concerning breeding sites for dengue vectors, has not been achieved.
Collapse
Affiliation(s)
- F Chiaravalloti Neto
- Centro Universitário de Rio Preto, Rua Rio Negro, 160, São José do Rio Preto, SP, 15091-390, Brasil.
| | | | | |
Collapse
|
39
|
Fernandes MA, Daniel E. Congenital ocular toxoplasmosis. Indian Pediatr 1990; 27:204-6. [PMID: 2361767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
40
|
Gomes J, Fernandes MA, Indi F, Da Gama MS, Sami J, Aaby P. [Malnutrition and infant mortality in the regions of Tombali, Cacheu, Oio, Biombo, and Gabu]. Bol Inf Socio Econ 1989; 5:11-44. [PMID: 12284148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
|
41
|
Fernandes MA. Extrusion of ventriculoperitoneal shunt through the anus. Indian Pediatr 1989; 26:86-7. [PMID: 2668165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
|
42
|
Burks BL, Fernandes MA, Satchler GR, Horen DJ, Bertrand FE, Blankenship JL, Ford JL, Gross EE, Hensley DC, Sayer RO, Shapira D, Sjoreen TP. Optical model and coupled-channels analyses of the elastic and inelastic scattering of 18O from 28Si at 352 MeV. Phys Rev C Nucl Phys 1988; 38:1680-1691. [PMID: 9954979 DOI: 10.1103/physrevc.38.1680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
43
|
Fernandes MA, Jackman PJ, Clark SA, Gunard SR. Detection and quantification of microorganisms in a heterogeneous foodstuff by image analysis. Comput Appl Biosci 1988; 4:291-5. [PMID: 3167603 DOI: 10.1093/bioinformatics/4.2.291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A relatively inexpensive image analysis system has been developed to semi-automate the detection and quantification of microbial growth in sections of food. A system based on an IBM PC compatible, with a frame store card, was programmed to scan Gram-stained sections using a motorized stage. Each field of view was thresholded after subtraction of a background image and the area between two thresholds measured. In the food studied it was found that, by using a size limit, it was possible to reduce the number of fields that needed to be examined by a microscopist to approximately 3% of those scanned. Visual examination was still required to distinguish bacterial cells from other stained objects which occasionally occur.
Collapse
Affiliation(s)
- M A Fernandes
- Department of Genetics and Microbiology, AFRC Institute of Food Research, Norwich Laboratory, UK
| | | | | | | |
Collapse
|
44
|
Beckerman M, Auble RL, Bertrand FE, Blankenship JL, Burks BL, Fernandes MA, Glover CW, Gross EE, Horen DJ, Sayer RO, Satchler GR, Shapira D, Sugiyama Y, Varner RL. Elastic and inelastic scattering of 58Ni. Phys Rev C Nucl Phys 1987; 36:657-666. [PMID: 9954123 DOI: 10.1103/physrevc.36.657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
45
|
Fernandes MA, Bertrand FE, Auble RL, Sayer RO, Burks BL, Horen DJ, Gross EE, Blankenship JL, Shapira D, Beckerman M. Single-nucleon transfer reactions induced by 376-MeV 17O on 208Pb. Phys Rev C Nucl Phys 1987; 36:108-114. [PMID: 9954056 DOI: 10.1103/physrevc.36.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
46
|
Bertrand FE, Sayer RO, Auble RL, Beckerman M, Blankenship JL, Burks BL, Fernandes MA, Glover CW, Gross EE, Horen DJ, Shapira D, Morsch HP. Excitation of the high energy nuclear continuum in 208Pb by 22 MeV/nucleon 17O and 32S. Phys Rev C Nucl Phys 1987; 35:111-116. [PMID: 9953743 DOI: 10.1103/physrevc.35.111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
47
|
Fernandes MA, Burks BL, Horen DJ, Satchler GR, Auble RL, Bertrand FE, Blankenship JL, Ford JL, Gross EE, Hensley DC, Sayer RO, Shapira D, Sjoreen TP. One-nucleon-transfer reactions induced by 352-MeV 18O on 28Si. Phys Rev C Nucl Phys 1986; 33:1971-1982. [PMID: 9953377 DOI: 10.1103/physrevc.33.1971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
48
|
Hall JW, Fernandes MA. The role of monaural frequency selectivity in binaural analysis. J Acoust Soc Am 1984; 76:435-439. [PMID: 6480996 DOI: 10.1121/1.391135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The relation between the monaural critical band and binaural analysis was examined using an NoSm MLD paradigm, in order to resolve ambiguities about the width of the masking spectrum important for binaural detection. A 500-Hz pure-tone signal was presented with a 600-Hz-wide band of masking noise to the signal ear. Bands of noise ranging in width from 25 to 600 Hz, or noise notches (imposed on a 600-Hz-wide band centered on the signal frequency) ranging in width from 0 to 600 Hz were presented to the nonsignal ear. All noise bands and notches were centered on 500 Hz, the frequency of the signal. The effects of varying bandwidth were radically different from those of varying notchwidth: the MLD changed from zero to approximately 8 dB over a bandwidth range of 400 Hz; for notchwidths, however, the MLD changed 8 dB over a range of only 50 Hz. The results support an interpretation that the fine frequency selectivity of monaural analysis is preserved in peripheral binaural interaction, but that a relatively wide frequency range of critical bands is scanned at a later stage of binaural processing. It was suggested that the wide spectral range of binaural analysis may provide a background against which binaural differences due to the signal are detected.
Collapse
|
49
|
Miyadahira AM, Fernandes MA. [Neurological regulation--nursing care]. Rev Paul Enferm 1984; 4:99-104. [PMID: 6570291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
|
50
|
Abstract
Detectability of a 400-ms, 1000-Hz pure-tone signal was examined in bandlimited noise where different spectral regions were given similar waveform envelope characteristics. As expected, in random noise the threshold increased as the noise bandwidth was increased up to a critical bandwidth, but remained constant for further increases in bandwidth. In the noise with envelope coherence however, threshold decreased when the noise bandwidth was made wider than the critical bandwidth. The improvement in detectability was attributed to a process by which energy outside the critical band is used to help differentiate signal from masking noise, provided that the waveform envelope characteristics of the noise inside and outside the critical band are similar. With flanking coherent noise bands either lower or higher in frequency than a noise band centered on the signal, it was next determined that the frequency relation and remoteness of the coherent noise did not particularly influence the magnitude of the unmasking effect. An interpretation in terms of nonsimultaneous masking was reconciled with some aspects of the data, and with an interpretation in terms of across-frequency temporal pattern analysis. This paradigm, in which detection is based upon across-frequency temporal envelope coherence, was termed "comodulation masking release." Comodulation offers a controlled way to investigate some of the mechanisms which permit signals to be detected at adverse signal-to-noise ratios.
Collapse
|