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Holistic face perception is impaired in developmental prosopagnosia

John Towler, Katie Fisher, Martin Eimer

Cortex, Volume: 108, Pages: 112 - 126

Swansea University Author: John Towler

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DOI (Published version): 10.1016/j.cortex.2018.07.019

Abstract

Individuals with developmental prosopagnosia (DP) have severe difficulties recognising familiar faces. A current debate is whether these face recognition impairments derive from problems with face perception and in particular whether individuals with DP cannot utilize holistic representations of ind...

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Published in: Cortex
ISSN: 00109452
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa43695
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spelling 2018-10-22T16:19:41.3121631 v2 43695 2018-09-05 Holistic face perception is impaired in developmental prosopagnosia 5bc86619011fcaa9caeb27d7f89b8e9e John Towler John Towler true false 2018-09-05 HPS Individuals with developmental prosopagnosia (DP) have severe difficulties recognising familiar faces. A current debate is whether these face recognition impairments derive from problems with face perception and in particular whether individuals with DP cannot utilize holistic representations of individual faces. To assess this hypothesis, we recorded event-related potentials (ERPs) during a sequential face identity matching task where successively presented pairs of upright faces were either identical or differed with respect to their internal features, their external features, or both. Participants with DP and age-matched controls reported on each trial whether the face pair was identical or different. To track the activation of cortical visual face memory representations, we measured N250r components over posterior face-selective regions. N250r components to full face repetitions were strongly attenuated for DPs as compared to control participants, indicating impaired face identity matching processes in DP. In the Control group, the N250r to full face repetitions was superadditive (i.e., larger than the sum of the two N250r components to partial repetitions of external or internal features). This demonstrates that holistic face representations were involved in identity matching processes. In the DP group, N250r components to full and partial identity repetitions were strictly additive, indicating that the identity matching of external and internal features operated in an entirely part-based fashion, without any involvement of holistic representations. In line with this conclusion, DPs also made a disproportionate number of errors on partial repetition trials, where they often failed to report a change of internal facial features. This suggests an atypical strategy for encoding external features as cues to identity in DP. These results provide direct electrophysiological and behavioural evidence for qualitative differences in the representation of face identity in the occipital-temporal face processing system in developmental prosopagnosia. Journal Article Cortex 108 112 126 00109452 30 11 2018 2018-11-30 10.1016/j.cortex.2018.07.019 COLLEGE NANME Psychology COLLEGE CODE HPS Swansea University 2018-10-22T16:19:41.3121631 2018-09-05T13:45:16.7542336 Faculty of Medicine, Health and Life Sciences School of Psychology John Towler 1 Katie Fisher 2 Martin Eimer 3 0043695-10102018110923.pdf 43695.pdf 2018-10-10T11:09:23.9170000 Output 1387030 application/pdf Accepted Manuscript true 2019-08-06T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng
title Holistic face perception is impaired in developmental prosopagnosia
spellingShingle Holistic face perception is impaired in developmental prosopagnosia
John Towler
title_short Holistic face perception is impaired in developmental prosopagnosia
title_full Holistic face perception is impaired in developmental prosopagnosia
title_fullStr Holistic face perception is impaired in developmental prosopagnosia
title_full_unstemmed Holistic face perception is impaired in developmental prosopagnosia
title_sort Holistic face perception is impaired in developmental prosopagnosia
author_id_str_mv 5bc86619011fcaa9caeb27d7f89b8e9e
author_id_fullname_str_mv 5bc86619011fcaa9caeb27d7f89b8e9e_***_John Towler
author John Towler
author2 John Towler
Katie Fisher
Martin Eimer
format Journal article
container_title Cortex
container_volume 108
container_start_page 112
publishDate 2018
institution Swansea University
issn 00109452
doi_str_mv 10.1016/j.cortex.2018.07.019
college_str Faculty of Medicine, Health and Life Sciences
hierarchytype
hierarchy_top_id facultyofmedicinehealthandlifesciences
hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str School of Psychology{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}School of Psychology
document_store_str 1
active_str 0
description Individuals with developmental prosopagnosia (DP) have severe difficulties recognising familiar faces. A current debate is whether these face recognition impairments derive from problems with face perception and in particular whether individuals with DP cannot utilize holistic representations of individual faces. To assess this hypothesis, we recorded event-related potentials (ERPs) during a sequential face identity matching task where successively presented pairs of upright faces were either identical or differed with respect to their internal features, their external features, or both. Participants with DP and age-matched controls reported on each trial whether the face pair was identical or different. To track the activation of cortical visual face memory representations, we measured N250r components over posterior face-selective regions. N250r components to full face repetitions were strongly attenuated for DPs as compared to control participants, indicating impaired face identity matching processes in DP. In the Control group, the N250r to full face repetitions was superadditive (i.e., larger than the sum of the two N250r components to partial repetitions of external or internal features). This demonstrates that holistic face representations were involved in identity matching processes. In the DP group, N250r components to full and partial identity repetitions were strictly additive, indicating that the identity matching of external and internal features operated in an entirely part-based fashion, without any involvement of holistic representations. In line with this conclusion, DPs also made a disproportionate number of errors on partial repetition trials, where they often failed to report a change of internal facial features. This suggests an atypical strategy for encoding external features as cues to identity in DP. These results provide direct electrophysiological and behavioural evidence for qualitative differences in the representation of face identity in the occipital-temporal face processing system in developmental prosopagnosia.
published_date 2018-11-30T03:55:00Z
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