FMRI repetition suppression for voices is modulated by stimulus expectations

Andics, Attila and Gál, V. and Vicsi, K. and Rudas, G. and Vidnyánszky, Zoltán (2013) FMRI repetition suppression for voices is modulated by stimulus expectations. NEUROIMAGE, 69. pp. 277-283. ISSN 1053-8119

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According to predictive coding models of sensory processing, stimulus expectations have a profound effect on sensory cortical responses. This was supported by experimental results, showing that fMRI repetition suppression (fMRI RS) for face stimuli is strongly modulated by the probability of stimulus repetitions throughout the visual cortical processing hierarchy. To test whether processing of voices is also affected by stimulus expectations, here we investigated the effect of repetition probability on fMRI RS in voice-selective cortical areas. Changing ('alt') and identical ('rep') voice stimulus pairs were presented to the listeners in blocks, with a varying probability of alt and rep trials across blocks. We found auditory fMRI RS in the nonprimary voice-selective cortical regions, including the bilateral posterior STS, the right anterior STG and the right IFC, as well as in the IPL. Importantly, fMRI RS effects in all of these areas were strongly modulated by the probability of stimulus repetition: auditory fMRI RS was reduced or not present in blocks with low repetition probability. Our results revealed that auditory fMRI RS in higher-level voice-selective cortical regions is modulated by repetition probabilities and thus suggest that in audition, similarly to the visual modality, processing of sensory information is shaped by stimulus expectation processes. © 2012 Elsevier Inc.

Item Type: Article
Uncontrolled Keywords: STS; STG; Predictive coding; FMRI repetition suppression; AMYGDALA; ADAPTATION
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia
Depositing User: MTMT SWORD
Date Deposited: 07 Feb 2014 02:54
Last Modified: 07 Feb 2014 02:55

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