Abstract：
:Several neuroimaging studies showed that fulfilled expectations increase the magnitude of repetition suppression (RS) in the face-selective visual cortex. However, previous fMRI studies did not allow a distinction between the reductions of the response due to stimulus repetitions and fulfilled expectations (expectation suppression, ES). In most prior studies repetitions and expectations were not independent from each other as repetitions occurred more often when they were expected and less often when they were not expected, thereby confounding RS with ES. To overcome this confound, we presented pairs of female and male faces that were either repeating or alternating with an overall probability of 50-50%. Orthogonally to this, the gender of the first face in each pair signaled with 75% accuracy whether repetitions or alternations were more likely to occur. We found significant RS in the FFA, the OFA and the LO. In addition, these areas showed a reduction of the response for expected when compared to surprising trials. Moreover, the effects of RS and ES were always additive rather than interactive in our ROIs. This implies that stimulus repetition and fulfilled expectations can be dissociated from one another in terms of their effects on the neural responses.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Grotheer M,Kovács Gdoi
10.1016/j.neuropsychologia.2014.12.017subject
Has Abstractpub_date
2015-01-01 00:00:00pages
175-82eissn
0028-3932issn
1873-3514pii
S0028-3932(14)00477-1journal_volume
67pub_type
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