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Montoya-Pedrón A, Ocaña Montoya CM, Santos Toural JE, Acosta Lee T, Sánchez-Hechavarría ME, López-Galán E, Muñoz-Bustos GA. Contingent Negative Variation in the Evaluation of Neurocognitive Disorders Due to Possible Alzheimer's Disease. Neurol Int 2024; 16:126-138. [PMID: 38251056 PMCID: PMC10801563 DOI: 10.3390/neurolint16010008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 01/23/2024] Open
Abstract
The usefulness of Contingent Negative Variation (CNV) potential as a biomarker of neurocognitive disorders due to possible Alzheimer's disease, is based on its possible physiological correlates. However, its application in the diagnostic evaluation of these disorders is still incipient. The aim of this study is to characterize the patterns of cognitive processing of information in the domain of nonspecific global attention, by recording potential CNV in a group of patients with neurocognitive disorders due to possible Alzheimer's disease. An experimental study of cases and controls was carried out. The sample included 39 patients classified according to DSM-5 with a neurocognitive disorder subtype possibly due Alzheimer's disease, and a Control Group of 53 subjects with normal cognitive functions. CNV potential was registered using standard protocol. The analysis of variance obtained significant differences in mean values and confidence intervals of total CNV amplitude between the three study groups. The late CNV segment amplitudes makes it possible to discriminate between the level of mild and major dysfunction in the group of patients. The CNV total amplitudes of potential allows for effective discrimination between normal cognitive functioning and neurocognitive disorders due to possible Alzheimer's disease.
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Affiliation(s)
- Arquímedes Montoya-Pedrón
- Department of Clinical Neurophysiology, General Hospital “Dr. Juan Bruno Zayas Alfonso”, Santiago de Cuba 90100, Cuba
| | | | | | - Tania Acosta Lee
- Department of Clinical Neurophysiology, General Hospital “Dr. Juan Bruno Zayas Alfonso”, Santiago de Cuba 90100, Cuba
| | - Miguel Enrique Sánchez-Hechavarría
- Departamento de Ciencias Clínicas y Preclínicas, Facultad de Medicina, Universidad Católica de la Santísima Concepción, Concepción 4070129, Chile
- Núcleo Científico de Ciencias de la Salud, Facultad de Ciencias de la Salud, Universidad Adventista de Chile, Chillán 8320000, Chile
- Laboratorio de Psicología, Departamento de Psicología, Universidad de Concepción, Concepción 4070386, Chile
| | - Erislandis López-Galán
- Facultad de Medicina 2, Universidad de Ciencias Médicas de Santiago de Cuba, Santiago de Cuba 90100, Cuba;
| | - Gustavo Alejandro Muñoz-Bustos
- Escuela de Kinesiología, Facultad de Salud y Ciencias Sociales, Campus El Boldal, Sede Concepción, Universidad de Las Américas, Concepción 4030000, Chile
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Rabi R, Chow R, Paracha S, Hasher L, Gardner S, Anderson ND, Alain C. The Effects of Aging and Time of Day on Inhibitory Control: An Event-Related Potential Study. Front Aging Neurosci 2022; 14:821043. [PMID: 35360220 PMCID: PMC8963784 DOI: 10.3389/fnagi.2022.821043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 02/17/2022] [Indexed: 12/03/2022] Open
Abstract
Time of day (TOD) influences on executive functions have been widely reported, with greater efficiency demonstrated at optimal relative to non-optimal TOD according to one’s chronotype (i.e., synchrony effect). Older adults (OAs) show declines in inhibitory control and are more sensitive to the effects of circadian variation on executive functioning. To date, no studies have investigated the effects of TOD and aging on executive functioning using electrophysiological measures. The present study investigated the effects of aging and TOD on the neural correlates of inhibitory processing (N2 and P3) using event-related potentials (ERPs). Go-NoGo and Flanker tasks were administered to 52 OAs of morning chronotype and 51 younger adults (YAs) of afternoon-to-evening chronotype who were randomly assigned to morning or afternoon test sessions, with the optimal TOD for OAs in the morning and for YAs in the afternoon/evening. While behavioral results demonstrated no TOD effects, ERPs indicated synchrony effects. Both YAs and OAs showed greater modulation of Go-NoGo N2 and greater P3 amplitude during the non-optimal than optimal TOD, consistent with the synchrony effect. For the Flanker task, age differences in P3 amplitude were only apparent during the non-optimal TOD. These results suggest that processes associated with inhibitory control are differentially affected by TOD and aging, with age-related reductions in inhibitory efficiency during off-peak test times on measures of interference control. These findings highlight the sensitivity of ERPs to detect TOD effects in the absence of behavioral differences, confirm more pronounced TOD effects in OAs relative to YAs on ERP measures of interference control, and reinforce the need to assess and control for circadian typology in research studies.
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Affiliation(s)
- Rahel Rabi
- Baycrest Centre, Rotman Research Institute, Toronto, ON, Canada
| | - Ricky Chow
- Baycrest Centre, Rotman Research Institute, Toronto, ON, Canada
| | - Shahier Paracha
- Baycrest Centre, Rotman Research Institute, Toronto, ON, Canada
| | - Lynn Hasher
- Baycrest Centre, Rotman Research Institute, Toronto, ON, Canada
- Department of Psychology, University of Toronto, Toronto, ON, Canada
| | - Sandra Gardner
- Baycrest Centre, Rotman Research Institute, Toronto, ON, Canada
- Biostatistics Division, Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
| | - Nicole D. Anderson
- Baycrest Centre, Rotman Research Institute, Toronto, ON, Canada
- Department of Psychology, University of Toronto, Toronto, ON, Canada
- Department of Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Claude Alain
- Baycrest Centre, Rotman Research Institute, Toronto, ON, Canada
- Department of Psychology, University of Toronto, Toronto, ON, Canada
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada
- *Correspondence: Claude Alain,
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Maldonado T, Orr JM, Goen JRM, Bernard JA. Age Differences in the Subcomponents of Executive Functioning. J Gerontol B Psychol Sci Soc Sci 2021; 75:e31-e55. [PMID: 31943092 DOI: 10.1093/geronb/gbaa005] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Indexed: 01/06/2023] Open
Abstract
OBJECTIVES Across the life span, deficits in executive functioning (EF) are associated with poor behavioral control and failure to achieve goals. Though EF is often discussed as one broad construct, a prominent model of EF suggests that it is composed of three subdomains: inhibition, set shifting, and updating. These subdomains are seen in both younger (YA) and older adults (OA), with performance deficits across subdomains in OA. Therefore, our goal was to investigate whether subdomains of EF might be differentially affected by age, and how these differences may relate to broader global age differences in EF. METHODS To assess these age differences, we conducted a meta-analysis at multiple levels, including task level, subdomain level, and of global EF. Based on previous work, we hypothesized that there would be overall differences in EF in OA. RESULTS Using 1,268 effect sizes from 401 articles, we found overall differences in EF with age. Results suggested that differences in performance are not uniform, such that variability in age effects emerged at the task level, and updating was not as affected by age as other subdomains. DISCUSSION These findings advance our understanding of age differences in EF, and stand to inform early detection of EF decline.
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Affiliation(s)
- Ted Maldonado
- Department of Psychological and Brain Sciences, Texas A&M University, College Station
| | - Joseph M Orr
- Department of Psychological and Brain Sciences, Texas A&M University, College Station.,Texas A&M Institute for Neuroscience, Texas A&M University, College Station
| | - James R M Goen
- Department of Psychological and Brain Sciences, Texas A&M University, College Station
| | - Jessica A Bernard
- Department of Psychological and Brain Sciences, Texas A&M University, College Station.,Texas A&M Institute for Neuroscience, Texas A&M University, College Station
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Richard's MM, Krzemien D, Valentina V, Vernucci S, Zamora EV, Comesaña A, García Coni A, Introzzi I. Cognitive flexibility in adulthood and advanced age: Evidence of internal and external validity. APPLIED NEUROPSYCHOLOGY-ADULT 2019; 28:464-478. [PMID: 31424274 DOI: 10.1080/23279095.2019.1652176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Aging causes changes that affect functioning of cognitive processes such as cognitive flexibility (CF). Given it allows changing both behavior and thinking in dynamic contexts, it constitutes an essential trait of adaptive, goal-oriented behavior. Despite its importance, specific techniques to evaluate CF in older adults are lacking. The goal of this article is to describe and comparatively analyze the functioning of CF in a sample of 169 individuals representing three age groups-younger-age, middle-age and advanced-age adults-by obtaining evidence of internal and external validity. Using a correlational and cross-sectional research design, four studies were conducted in order to evaluate construct validity-fulfillment of experimental paradigm criteria and contrast between groups and tests with different methods. In addition to the Fingers Task, the study used the CAMBIOS Cognitive Flexibility Test, TAC's Conjunction Visual Search Task (which evaluates perceptual inhibition) and a verbal fluency task with changes. The results provide evidence of the functioning of CF in adulthood and advanced age, which has implications for neurocognitive clinical evaluation in these stages of life. Additionally, evidence was obtained in favor of the concurrent validity of the instruments used to measure CF, contributing to the solidity of future studies on this executive function.
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Affiliation(s)
- María M Richard's
- Psychology Department, National University of Mar Del Plata IPSIBAT (Institute of Basic Applied Psychology and Technology), Buenos Aires, Argentina.,CONICET (National Council of Scientific and Technical Research), Buenos Aires, Argentina
| | - Deisy Krzemien
- Psychology Department, National University of Mar Del Plata IPSIBAT (Institute of Basic Applied Psychology and Technology), Buenos Aires, Argentina.,CONICET (National Council of Scientific and Technical Research), Buenos Aires, Argentina
| | - Vido Valentina
- Psychology Department, National University of Mar Del Plata IPSIBAT (Institute of Basic Applied Psychology and Technology), Buenos Aires, Argentina.,CONICET (National Council of Scientific and Technical Research), Buenos Aires, Argentina
| | - Santiago Vernucci
- Psychology Department, National University of Mar Del Plata IPSIBAT (Institute of Basic Applied Psychology and Technology), Buenos Aires, Argentina.,CONICET (National Council of Scientific and Technical Research), Buenos Aires, Argentina
| | - Eliana V Zamora
- Psychology Department, National University of Mar Del Plata IPSIBAT (Institute of Basic Applied Psychology and Technology), Buenos Aires, Argentina.,CONICET (National Council of Scientific and Technical Research), Buenos Aires, Argentina
| | - Ana Comesaña
- Psychology Department, National University of Mar Del Plata IPSIBAT (Institute of Basic Applied Psychology and Technology), Buenos Aires, Argentina.,CONICET (National Council of Scientific and Technical Research), Buenos Aires, Argentina
| | - Ana García Coni
- Psychology Department, National University of Mar Del Plata IPSIBAT (Institute of Basic Applied Psychology and Technology), Buenos Aires, Argentina.,CONICET (National Council of Scientific and Technical Research), Buenos Aires, Argentina
| | - Isabel Introzzi
- Psychology Department, National University of Mar Del Plata IPSIBAT (Institute of Basic Applied Psychology and Technology), Buenos Aires, Argentina.,CONICET (National Council of Scientific and Technical Research), Buenos Aires, Argentina
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5
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Cheng CH, Tsai HY, Cheng HN. The effect of age on N2 and P3 components: A meta-analysis of Go/Nogo tasks. Brain Cogn 2019; 135:103574. [PMID: 31200173 DOI: 10.1016/j.bandc.2019.05.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 05/24/2019] [Accepted: 05/27/2019] [Indexed: 01/27/2023]
Abstract
Suppressing the neural activities to non-target stimuli becomes problematic with advancing age. Go/Nogo tasks, in which subjects are instructed to respond to a certain type of stimuli (Go) and withhold responses to other types of predefined stimuli (Nogo), have been extensively employed to study the age-related alterations of cognitive inhibition. However, it remains inconclusive whether the N2 and P3 electrophysiological responses to successful inhibition to Nogo stimuli are affected by aging processes. Thus, we performed a meta-analysis of Go/Nogo studies to investigate the age effect on Nogo-N2 and Nogo-P3 activities as well as behavioral performance of commission errors. The potential moderators regarding different probabilities of Nogo trials and levels of task difficulty on the effect sizes were also assessed. There were no significant age-related differences in commission errors. However, compared to the younger group, the elderly demonstrated reduced Nogo-N2 amplitudes, particularly in the condition where Nogo probability was less than 50%. Furthermore, age-related reduction of Nogo-P3 amplitudes and prolongation of Nogo-P3 latencies were observed in the condition where Nogo probability was less than 50%. In conclusion, our data suggest that despite similar behavioral performance in the younger and older adults, neural processing of response inhibition becomes inefficient with advancing age.
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Affiliation(s)
- Chia-Hsiung Cheng
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, Chang Gung University, Taoyuan, Taiwan; Laboratory of Brain Imaging and Neural Dynamics (BIND Lab), Chang Gung University, Taoyuan, Taiwan; Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan; Department of Psychiatry, Chang Gung Memorial Hospital, Linkou, Taiwan.
| | - Huei-Yu Tsai
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, Chang Gung University, Taoyuan, Taiwan; Laboratory of Brain Imaging and Neural Dynamics (BIND Lab), Chang Gung University, Taoyuan, Taiwan
| | - Hsin-Ni Cheng
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, Chang Gung University, Taoyuan, Taiwan; Laboratory of Brain Imaging and Neural Dynamics (BIND Lab), Chang Gung University, Taoyuan, Taiwan
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Lockwood CT, Vaughn W, Duffy CJ. Attentional ERPs distinguish aging and early Alzheimer's dementia. Neurobiol Aging 2018; 70:51-58. [PMID: 29960173 DOI: 10.1016/j.neurobiolaging.2018.05.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 05/17/2018] [Accepted: 05/18/2018] [Indexed: 10/14/2022]
Abstract
The early detection of Alzheimer's disease requires our distinguishing it from cognitive aging. Here, we test whether spatial attentional changes might support that distinction. We engaged young normal (YN), older normal (ON), and patients with early Alzheimer's dementia (EAD) in an attentionally cued, self-movement heading discrimination task while we recorded push-button response times and event related potentials. YNs and ONs show the behavioral effects of attentional shifts from the cue to the target, whereas EAD patients did not (p < 0.001). YNs and ONs also show the shifting lateralization of a newly described attentional event related potentials component, whereas EAD patients did not (p < 0.001). Our findings suggest that spatial inattention in EAD patients may contribute to heading direction processing impairments that distinguish them from ONs and undermine their navigational capacity and driving safety.
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Affiliation(s)
- Colin T Lockwood
- Departments of Neurology, Brain and Cognitive Sciences, Ophthalmology, The Center for Visual Science, The University of Rochester Medical Center, Rochester, NY 14642-0673, USA
| | - William Vaughn
- Departments of Neurology, Brain and Cognitive Sciences, Ophthalmology, The Center for Visual Science, The University of Rochester Medical Center, Rochester, NY 14642-0673, USA
| | - Charles J Duffy
- Departments of Neurology, Brain and Cognitive Sciences, Ophthalmology, The Center for Visual Science, The University of Rochester Medical Center, Rochester, NY 14642-0673, USA.
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7
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Alain C, Cusimano M, Garami L, Backer KC, Habelt B, Chan V, Hasher L. Age-related differences in orienting attention to sound object representations. Neurobiol Aging 2018; 66:1-11. [DOI: 10.1016/j.neurobiolaging.2018.01.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 01/30/2018] [Accepted: 01/31/2018] [Indexed: 10/18/2022]
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8
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Modifications in resting state functional anticorrelation between default mode network and dorsal attention network: comparison among young adults, healthy elders and mild cognitive impairment patients. Brain Imaging Behav 2017; 12:127-141. [DOI: 10.1007/s11682-017-9686-y] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Ziaei M, Burianová H, von Hippel W, Ebner NC, Phillips LH, Henry JD. The impact of aging on the neural networks involved in gaze and emotional processing. Neurobiol Aging 2016; 48:182-194. [DOI: 10.1016/j.neurobiolaging.2016.08.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 08/21/2016] [Accepted: 08/29/2016] [Indexed: 11/28/2022]
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10
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Kropotov J, Ponomarev V, Tereshchenko EP, Müller A, Jäncke L. Effect of Aging on ERP Components of Cognitive Control. Front Aging Neurosci 2016; 8:69. [PMID: 27092074 PMCID: PMC4821853 DOI: 10.3389/fnagi.2016.00069] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Accepted: 03/21/2016] [Indexed: 11/13/2022] Open
Abstract
As people age, their performance on tasks requiring cognitive control often declines. Such a decline is frequently explained as either a general or specific decline in cognitive functioning with age. In the context of hypotheses suggesting a general decline, it is often proposed that processing speed generally declines with age. A further hypothesis is that an age-related compensation mechanism is associated with a specific cognitive decline. One prominent theory is the compensation hypothesis, which proposes that deteriorated functions are compensated for by higher performing functions. In this study, we used event-related potentials (ERPs) in the context of a GO/NOGO task to examine the age-related changes observed during cognitive control in a large group of healthy subjects aged between 18 and 84 years. The main question we attempted to answer was whether we could find neurophysiological support for either a general decline in processing speed or a compensation strategy. The subjects performed a relatively demanding cued GO/NOGO task with similar omissions and reaction times across the five age groups. The ERP waves of cognitive control, such as N2, P3cue and CNV, were decomposed into latent components by means of a blind source separation method. Based on this decomposition, it was possible to more precisely delineate the different neurophysiological and psychological processes involved in cognitive control. These data support the processing speed hypothesis because the latencies of all cognitive control ERP components increased with age, by 8 ms per decade for the early components (<200 ms) and by 20 ms per decade for the late components. At the same time, the compensatory hypothesis of aging was also supported, as the amplitudes of the components localized in posterior brain areas decreased with age, while those localized in the prefrontal cortical areas increased with age in order to maintain performance on this simple task at a relatively stable level.
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Affiliation(s)
- Juri Kropotov
- Norwegian University of Science and TechnologyTrondheim, Norway; Department of Neuropsychology, Andrzej Frycz-Modrzewski Krakow UniversityKrakow, Poland; Laboratory of Neurobiology of Action Programming, N.P. Bechtereva Institute of the Human Brain, Russian Academy of SciencesSt. Petersburg, Russia
| | - Valery Ponomarev
- Laboratory of Neurobiology of Action Programming, N.P. Bechtereva Institute of the Human Brain, Russian Academy of Sciences St. Petersburg, Russia
| | - Ekaterina P Tereshchenko
- Laboratory of Neurobiology of Action Programming, N.P. Bechtereva Institute of the Human Brain, Russian Academy of Sciences St. Petersburg, Russia
| | | | - Lutz Jäncke
- Department of Psychology, Division of Neuropsychology, University of ZurichChur, Switzerland; International Normal Aging and Plasticity Research Centre (INAPIC) ZurichChur, Switzerland; University Research Priority Program "Dynamics of Healthy Aging", University of ZurichChur, Switzerland
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11
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Burianová H, Marstaller L, Choupan J, Sepehrband F, Ziaei M, Reutens D. The relation of structural integrity and task-related functional connectivity in the aging brain. Neurobiol Aging 2015; 36:2830-7. [DOI: 10.1016/j.neurobiolaging.2015.07.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Revised: 07/02/2015] [Accepted: 07/05/2015] [Indexed: 12/12/2022]
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12
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Lucci G, Berchicci M, Spinelli D, Taddei F, Di Russo F. The effects of aging on conflict detection. PLoS One 2013; 8:e56566. [PMID: 23418584 PMCID: PMC3572012 DOI: 10.1371/journal.pone.0056566] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 01/13/2013] [Indexed: 11/19/2022] Open
Abstract
Several cognitive changes characterize normal aging; one change regards inhibitory processing and includes both conflict monitoring and response suppression. We attempted to segregate these two aspects within a Go/No-go task, investigating three age categories. Accuracy, response times and event-related potentials (ERPs) were recorded. The ERP data were analyzed, and the Go and No-go trials were separated; in addition, the trials were organized in repeat trials (in which the subjects repeated the action delivered in the previous trial) and switch trials (in which the subjects produced a response opposite to the previous response). We assumed that the switch trials conveyed more conflict than the repeat trials. In general, the behavioral data and slower P3 latencies confirmed the well-known age-related speed/accuracy trade-off. The novel analyses of the repeat vs. switch trials indicated that the age-related P3 slowing was significant only for the high conflict condition; the switch-P3 amplitude increased only in the two older groups. The 'aging switch effect' on the P3 component suggests a failure in the conflict conditions and likely contributes to a generalized dysfunction. The absence of either a switch effect in the young group and the P3 slowing in middle-aged group indicate that switching was not particularly demanding for these participants. The N2 component was less sensitive to the repeat/switch manipulation; however, the subtractive waves also enhanced the age effects in this earlier time window. The topographic maps showed other notable age effects: the frontal No-go N2 was nearly undetectable in the elderly; in the identical time window, a large activity in the posterior and prefrontal scalp regions was observed. Moreover, the prefrontal activity showed a negative correlation with false alarms. These results suggest that the frontal involvement during action suppression becomes progressively dysfunctional with aging, and additional activity was required to reach a good level of accuracy.
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Affiliation(s)
- Giuliana Lucci
- Department of Human Movement, Social and Health Science, University of Rome Foro Italico, Rome, Italy.
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13
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A history of sport-related concussion on event-related brain potential correlates of cognition. Int J Psychophysiol 2011; 82:16-23. [DOI: 10.1016/j.ijpsycho.2011.02.010] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 02/07/2011] [Accepted: 02/11/2011] [Indexed: 11/21/2022]
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