1
|
Peel HJ, Chouinard PA. A review of the impairments, preserved visual functions, and neuropathology in 21 patients with visual form agnosia - A unique defect with line drawings. Neuropsychologia 2023; 190:108666. [PMID: 37634886 DOI: 10.1016/j.neuropsychologia.2023.108666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 08/14/2023] [Accepted: 08/18/2023] [Indexed: 08/29/2023]
Abstract
We present a comprehensive review of the rare syndrome visual form agnosia (VFA). We begin by documenting its history, including the origins of the term, and the first case study labelled as VFA. The defining characteristics of the syndrome, as others have previously defined it, are then described. The impairments, preserved aspects of visual perception, and areas of brain damage in 21 patients who meet these defining characteristics are described in detail, including which tests were used to verify the presence or absence of key symptoms. From this, we note important similarities along with notable areas of divergence between patients. Damage to the occipital lobe (20/21), an inability to recognise line drawings (19/21), preserved colour vision (14/21), and visual field defects (16/21) were areas of consistency across most cases. We found it useful to distinguish between shape and form as distinct constructs when examining perceptual abilities in VFA patients. Our observations suggest that these patients often exhibit difficulties in processing simplified versions of form. Deficits in processing orientation and size were uncommon. Motion perception and visual imagery were not widely tested for despite being typically cited as defining features of the syndrome - although in the sample described, motion perception was never found to be a deficit. Moreover, problems with vision (e.g., poor visual acuity and the presence of hemianopias/scotomas in the visual fields) are more common than we would have thought and may also contribute to perceptual impairments in patients with VFA. We conclude that VFA is a perceptual disorder where the visual system has a reduced ability to synthesise lines together for the purposes of making sense of what images represent holistically.
Collapse
Affiliation(s)
- Hayden J Peel
- Department of Psychology, Counselling and Therapy, School of Psychology and Public Health, La Trobe University, Victoria, Australia
| | - Philippe A Chouinard
- Department of Psychology, Counselling and Therapy, School of Psychology and Public Health, La Trobe University, Victoria, Australia.
| |
Collapse
|
2
|
Tiedemann H, Morgenstern Y, Schmidt F, Fleming RW. One-shot generalization in humans revealed through a drawing task. eLife 2022; 11:75485. [PMID: 35536739 PMCID: PMC9090327 DOI: 10.7554/elife.75485] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 05/01/2022] [Indexed: 11/13/2022] Open
Abstract
Humans have the amazing ability to learn new visual concepts from just a single exemplar. How we achieve this remains mysterious. State-of-the-art theories suggest observers rely on internal 'generative models', which not only describe observed objects, but can also synthesize novel variations. However, compelling evidence for generative models in human one-shot learning remains sparse. In most studies, participants merely compare candidate objects created by the experimenters, rather than generating their own ideas. Here, we overcame this key limitation by presenting participants with 2D 'Exemplar' shapes and asking them to draw their own 'Variations' belonging to the same class. The drawings reveal that participants inferred-and synthesized-genuine novel categories that were far more varied than mere copies. Yet, there was striking agreement between participants about which shape features were most distinctive, and these tended to be preserved in the drawn Variations. Indeed, swapping distinctive parts caused objects to swap apparent category. Our findings suggest that internal generative models are key to how humans generalize from single exemplars. When observers see a novel object for the first time, they identify its most distinctive features and infer a generative model of its shape, allowing them to mentally synthesize plausible variants.
Collapse
Affiliation(s)
- Henning Tiedemann
- Department of Experimental Psychology, Justus Liebig University Giessen, Giessen, Germany
| | - Yaniv Morgenstern
- Department of Experimental Psychology, Justus Liebig University Giessen, Giessen, Germany.,Laboratory of Experimental Psychology, University of Leuven (KU Leuven), Leuven, Belgium
| | - Filipp Schmidt
- Department of Experimental Psychology, Justus Liebig University Giessen, Giessen, Germany.,Center for Mind, Brain and Behavior (CMBB), University of Marburg and Justus Liebig University Giessen, Giessen, Germany
| | - Roland W Fleming
- Department of Experimental Psychology, Justus Liebig University Giessen, Giessen, Germany.,Center for Mind, Brain and Behavior (CMBB), University of Marburg and Justus Liebig University Giessen, Giessen, Germany
| |
Collapse
|
3
|
Jüttner M, Strasburger H, Treutwein B, Landis T, Rentschler I. Complementary deficits in perceptual classification in pure alexia and acquired prosopagnosia - New insights from two classic cases. Neuropsychologia 2021; 155:107820. [PMID: 33676958 DOI: 10.1016/j.neuropsychologia.2021.107820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 01/24/2021] [Accepted: 03/02/2021] [Indexed: 11/30/2022]
Abstract
Pure alexia and prosopagnosia traditionally have been seen as prime examples of dissociated, category-specific agnosias affecting reading and face recognition, respectively. More recent accounts have moved towards domain-independent explanations that postulate potential cross-links between different types of visual agnosia. According to one proposal, abnormal crowding, i.e. the impairment of recognition when features of adjacent objects are positioned too closely to each other, might provide a unified account for the perceptual deficits experienced by an agnosic patient. An alternative approach is based on the notion of complementary visual subsystems favouring the processing of abstract categories and specific exemplars, respectively. To test predictions of these two approaches with regard to pure alexia and prosopagnosia, we present previously unpublished data on digit recognition and visual crowding from two in the neuropsychological literature extensively studied patients, KD and MT (e.g., Campbell et al., 1986; Landis and Regard, 1988; Rentschler et al., 1994). Patient MT, diagnosed with pure alexia, showed pronounced abnormal foveal crowding, whereas KD, diagnosed with prosopagnosia, did not. These results form a distinct double dissociation with the performance of the two patients in other perceptual classification tasks involving Gabor micropatterns and textures, as well as Glass patterns, which revealed a significantly greater impairment in KD relative to MT. Based on an analysis of the specific task demands we argue that prosopagnosia and pure alexia may involve complementary deficits in instantiation and abstraction, respectively, during perceptual classification, beyond any category specificity. Such an explanation appears in line with previous distinctions between a predominantly left-hemispheric, abstract-category and a predominantly right-hemispheric, specific-exemplar subsystem underlying object recognition.
Collapse
Affiliation(s)
- Martin Jüttner
- School of Psychology, College of Health and Life Sciences, Aston University, Birmingham, UK.
| | | | | | | | - Ingo Rentschler
- Institute of Medical Psychology, University of Munich, Germany
| |
Collapse
|
4
|
Gerlach C, Robotham RJ. Object recognition and visual object agnosia. HANDBOOK OF CLINICAL NEUROLOGY 2021; 178:155-173. [PMID: 33832675 DOI: 10.1016/b978-0-12-821377-3.00008-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The term visual agnosia is used to refer to recognition disorders that are confined to the visual modality, that are not due to an impairment in sensory functions, and that cannot be explained by other cognitive deficits or by general reduction in intellectual ability. Here, we describe the different types of visual agnosia that have been reported (form agnosia, integrative agnosia, associative agnosia, transformational and orientation agnosia as well as category-specific impairments such as pure alexia and prosopagnosia) and how they relate to the current understanding of visual object recognition. Together with related disorders such as simultanagnosia, texture agnosia, aphantasia, and optic aphasia, these visual perceptual impairments can have severe consequences for those affected. We suggest how in-depth assessment can be carried out to determine the type and the extent of these impairments. In the context of clinical assessment, a step-by-step approach reflecting a posterior to anterior gradient in visual object recognition, from more perceptual to more memory-related processes, is suggested. Individually tailored interventions targeting the identified impairments can be initiated based on the results of the assessment.
Collapse
Affiliation(s)
- Christian Gerlach
- Department of Psychology, University of Southern Denmark, Odense, Denmark.
| | - Ro Julia Robotham
- Department of Psychology, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
5
|
Haigh SM, Robinson AK, Grover P, Behrmann M. Differentiation of Types of Visual Agnosia Using EEG. Vision (Basel) 2018; 2:E44. [PMID: 31735907 PMCID: PMC6836011 DOI: 10.3390/vision2040044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 12/05/2018] [Accepted: 12/13/2018] [Indexed: 11/23/2022] Open
Abstract
Visual recognition deficits are the hallmark symptom of visual agnosia, a neuropsychological disorder typically associated with damage to the visual system. Most research into visual agnosia focuses on characterizing the deficits through detailed behavioral testing, and structural and functional brain scans are used to determine the spatial extent of any cortical damage. Although the hierarchical nature of the visual system leads to clear predictions about the temporal dynamics of cortical deficits, there has been little research on the use of neuroimaging methods with high temporal resolution to characterize the temporal profile of agnosia deficits. Here, we employed high-density electroencephalography (EEG) to investigate alterations in the temporal dynamics of the visual system in two individuals with visual agnosia. In the context of a steady state visual evoked potential paradigm (SSVEP), individuals viewed pattern-reversing checkerboards of differing spatial frequency, and we assessed the responses of the visual system in the frequency and temporal domain. JW, a patient with early visual cortex damage, showed impaired SSVEP response relative to a control group and to the second patient (SM) who had right temporal lobe damage. JW also showed lower decoding accuracy for early visual responses (around 100 ms). SM, whose lesion is more anterior in the visual system, showed good decoding accuracy initially but low decoding after 500 ms. Overall, EEG and multivariate decoding methods can yield important insights into the temporal dynamics of visual responses in individuals with visual agnosia.
Collapse
Affiliation(s)
- Sarah M. Haigh
- Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Department of Psychology and Center for Integrative Neuroscience, University of Nevada, Reno, NV 89557, USA
| | - Amanda K. Robinson
- Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- ARC Centre of Excellence in Cognition and its Disorders, Department of Cognitive Science, Macquarie University, Sydney 2109, Australia
- School of Psychology, The University of Sydney, Sydney 2006, Australia
| | - Pulkit Grover
- Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Marlene Behrmann
- Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| |
Collapse
|
6
|
Sand K, Robotham RJ, Martelli M, Starrfelt R. Visual crowding in pure alexia and acquired prosopagnosia. Cogn Neuropsychol 2018; 35:361-370. [DOI: 10.1080/02643294.2018.1483325] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Katrine Sand
- Department of Psychology, University of Copenhagen, Copenhagen, Denmark
| | - Ro Julia Robotham
- Department of Psychology, University of Copenhagen, Copenhagen, Denmark
| | | | - Randi Starrfelt
- Department of Psychology, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
7
|
Abstract
A longstanding controversy concerns the functional organization of high-level vision, and the extent to which the recognition of different classes of visual stimuli engages a single system or multiple independent systems. We examine this in the context of congenital prosopagnosia (CP), a neurodevelopmental disorder in which individuals, without a history of brain damage, are impaired at face recognition. This paper reviews all CP cases from 1976 to 2016, and explores the evidence for the association or dissociation of face and object recognition. Of the 238 CP cases with data permitting a satisfactory evaluation, 80.3% evinced an association between impaired face and object recognition whereas 19.7% evinced a dissociation. We evaluate the strength of the evidence and correlate the face and object recognition behaviour. We consider the implications for theories of functional organization of the visual system, and offer suggestions for further adjudication of the relationship between face and object recognition.
Collapse
Affiliation(s)
- Jacob Geskin
- a Department of Psychology and Center for the Neural Basis of Cognition , Carnegie Mellon University , Pittsburgh , PA , USA
| | - Marlene Behrmann
- a Department of Psychology and Center for the Neural Basis of Cognition , Carnegie Mellon University , Pittsburgh , PA , USA
| |
Collapse
|
8
|
Zhou B, Pöppel E, Wang L, Yang T, Zaytseva Y, Bao Y. Seeing without knowing: Operational principles along the early visual pathway. Psych J 2016; 5:145-60. [PMID: 27678480 DOI: 10.1002/pchj.141] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 07/20/2016] [Accepted: 07/22/2016] [Indexed: 02/04/2023]
Affiliation(s)
- Bin Zhou
- Key Laboratory of Behavioral Science, Institute of Psychology; Chinese Academy of Sciences; Beijing China
| | - Ernst Pöppel
- School of Psychological and Cognitive Sciences, Key Laboratory of Machine Perception (Ministry of Education), and Beijing Key Laboratory of Behavior and Mental Health; Peking University; Beijing China
- Institute of Medical Psychology and Human Science Center; Ludwig-Maximilians-University; Munich Germany
| | - Lingyan Wang
- School of Psychological and Cognitive Sciences, Key Laboratory of Machine Perception (Ministry of Education), and Beijing Key Laboratory of Behavior and Mental Health; Peking University; Beijing China
| | - Taoxi Yang
- Institute of Medical Psychology and Human Science Center; Ludwig-Maximilians-University; Munich Germany
| | - Yuliya Zaytseva
- Institute of Medical Psychology and Human Science Center; Ludwig-Maximilians-University; Munich Germany
- Department of National IT System of Mental Health and Brain Monitoring; National Institute of Mental Health; Klecany Czech Republic
- Department of Psychiatry and Medical Psychology, 3rd Faculty of Medicine; Charles University; Prague Czech Republic
| | - Yan Bao
- School of Psychological and Cognitive Sciences, Key Laboratory of Machine Perception (Ministry of Education), and Beijing Key Laboratory of Behavior and Mental Health; Peking University; Beijing China
- Institute of Medical Psychology and Human Science Center; Ludwig-Maximilians-University; Munich Germany
| |
Collapse
|
9
|
Abstract
This research is an investigation of whether consciousness-one's ongoing experience-influences one's behavior and, if so, how. Analysis of the components, structure, properties, and temporal sequences of consciousness has established that, (1) contrary to one's intuitive understanding, consciousness does not have an active, executive role in determining behavior; (2) consciousness does have a biological function; and (3) consciousness is solely information in various forms. Consciousness is associated with a flexible response mechanism (FRM) for decision-making, planning, and generally responding in nonautomatic ways. The FRM generates responses by manipulating information and, to function effectively, its data input must be restricted to task-relevant information. The properties of consciousness correspond to the various input requirements of the FRM; and when important information is missing from consciousness, functions of the FRM are adversely affected; both of which indicate that consciousness is the input data to the FRM. Qualitative and quantitative information (shape, size, location, etc.) are incorporated into the input data by a qualia array of colors, sounds, and so on, which makes the input conscious. This view of the biological function of consciousness provides an explanation why we have experiences; why we have emotional and other feelings, and why their loss is associated with poor decision-making; why blindsight patients do not spontaneously initiate responses to events in their blind field; why counter-habitual actions are only possible when the intended action is in mind; and the reason for inattentional blindness.
Collapse
Affiliation(s)
- Brian Earl
- Independent Researcher, Formerly Affiliated with the School of Psychological Sciences, Monash University Melbourne, Australia
| |
Collapse
|