Unsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area

Abstract Recent work casts Repetition Suppression (RS), i.e. the reduced neural response to repeated stimuli, as the consequence of reduced surprise for repeated inputs. This research, along with other studies documenting Expectation Suppression, i.e. reduced responses to expected stimuli, emphasize...

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Autores principales:	Auréliane Pajani, Sid Kouider, Paul Roux, Vincent de Gardelle
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/baae28f1c9424ce4bdcbbec1e2c5cbce
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spelling	oai:doaj.org-article:baae28f1c9424ce4bdcbbec1e2c5cbce2021-12-02T12:32:19ZUnsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area10.1038/s41598-017-00243-32045-2322https://doaj.org/article/baae28f1c9424ce4bdcbbec1e2c5cbce2017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00243-3https://doaj.org/toc/2045-2322Abstract Recent work casts Repetition Suppression (RS), i.e. the reduced neural response to repeated stimuli, as the consequence of reduced surprise for repeated inputs. This research, along with other studies documenting Expectation Suppression, i.e. reduced responses to expected stimuli, emphasizes the role of expectations and predictive codes in perception. Here, we use fMRI to further characterize the nature of predictive signals in the human brain. Prior to scanning, participants were implicitly exposed to associations within face pairs. Critically, we found that this resulted in exemplar-specific Expectation Suppression in the fusiform face-sensitive area (FFA): individual faces that could be predicted from the associations elicited reduced FFA responses, as compared to unpredictable faces. Thus, predictive signals in the FFA are specific to face exemplars, and not only generic to the category of face stimuli. In addition, we show that under such circumstances, the occurrence of surprising repetitions did not trigger enhanced brain responses, as had been recently hypothesized, but still suppressed responses, suggesting that repetition suppression might be partly ‘unsuppressible’. Repetition effects cannot be fully modulated by expectations, which supports the recent view that expectation and repetition effects rest on partially independent mechanisms. Altogether, our study sheds light on the nature of expectation signals along the perceptual system.Auréliane PajaniSid KouiderPaul RouxVincent de GardelleNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Auréliane Pajani Sid Kouider Paul Roux Vincent de Gardelle Unsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area
description	Abstract Recent work casts Repetition Suppression (RS), i.e. the reduced neural response to repeated stimuli, as the consequence of reduced surprise for repeated inputs. This research, along with other studies documenting Expectation Suppression, i.e. reduced responses to expected stimuli, emphasizes the role of expectations and predictive codes in perception. Here, we use fMRI to further characterize the nature of predictive signals in the human brain. Prior to scanning, participants were implicitly exposed to associations within face pairs. Critically, we found that this resulted in exemplar-specific Expectation Suppression in the fusiform face-sensitive area (FFA): individual faces that could be predicted from the associations elicited reduced FFA responses, as compared to unpredictable faces. Thus, predictive signals in the FFA are specific to face exemplars, and not only generic to the category of face stimuli. In addition, we show that under such circumstances, the occurrence of surprising repetitions did not trigger enhanced brain responses, as had been recently hypothesized, but still suppressed responses, suggesting that repetition suppression might be partly ‘unsuppressible’. Repetition effects cannot be fully modulated by expectations, which supports the recent view that expectation and repetition effects rest on partially independent mechanisms. Altogether, our study sheds light on the nature of expectation signals along the perceptual system.
format	article
author	Auréliane Pajani Sid Kouider Paul Roux Vincent de Gardelle
author_facet	Auréliane Pajani Sid Kouider Paul Roux Vincent de Gardelle
author_sort	Auréliane Pajani
title	Unsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area
title_short	Unsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area
title_full	Unsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area
title_fullStr	Unsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area
title_full_unstemmed	Unsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area
title_sort	unsuppressible repetition suppression and exemplar-specific expectation suppression in the fusiform face area
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/baae28f1c9424ce4bdcbbec1e2c5cbce
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Unsuppressible Repetition Suppression and exemplar-specific Expectation Suppression in the Fusiform Face Area

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