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Impossible expectations: fMRI adaptation in the lateral occipital complex (LOC) is modulated by the statistical regularities of 3D structural information.

To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.neuroimage.2015.07.085 Byline: Erez Freud [erezfreud@gmail.coml] (*), Tzvi Ganel [ganelt@bgu.ac.il], Galia Avidan [galiaa@bgu.ac.il] Keywords fMRI adaptation; Impossi... Full description

Journal Title: NeuroImage November 15, 2015, Vol.122, pp.188-194
Main Author: Freud, Erez
Other Authors: Ganel, Tzvi , Avidan, Galia
Format: Electronic Article Electronic Article
Language: English
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ID: E-ISSN: 1095-9572 ; DOI: 10.1016/j.neuroimage.2015.07.085
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title: Impossible expectations: fMRI adaptation in the lateral occipital complex (LOC) is modulated by the statistical regularities of 3D structural information.
format: Article
creator:
  • Freud, Erez
  • Ganel, Tzvi
  • Avidan, Galia
subjects:
  • Adaptation, Physiological–Physiology
  • Adult–Physiology
  • Brain Mapping–Physiology
  • Female–Physiology
  • Form Perception–Physiology
  • Humans–Physiology
  • Magnetic Resonance Imaging–Physiology
  • Male–Physiology
  • Occipital Lobe–Physiology
  • Pattern Recognition, Visual–Physiology
  • Statistics As Topic–Physiology
  • Young Adult–Physiology
  • Impossible Objects
  • Object Recognition
  • Perceptual Expectations
  • Fmri Adaptation
ispartof: NeuroImage, November 15, 2015, Vol.122, pp.188-194
description: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.neuroimage.2015.07.085 Byline: Erez Freud [erezfreud@gmail.coml] (*), Tzvi Ganel [ganelt@bgu.ac.il], Galia Avidan [galiaa@bgu.ac.il] Keywords fMRI adaptation; Impossible objects; Perceptual expectations; Object recognition Highlights * Possible, spatially expected objects elicited fMRI adaptation (fMRIa) effect in LOC. * Impossible, spatially unexpected objects did not elicit fMRIa effect in LOC. * Stimulus order modulated the activation profile in the alternated trials in LOC. * Real-world spatial statistical regularities play an important role in fMRIa. Abstract fMRI adaptation (fMRIa), the attenuation of fMRI signal which follows repeated presentation of a stimulus, is a well-documented phenomenon. Yet, the underlying neural mechanisms supporting this effect are not fully understood. Recently, short-term perceptual expectations, induced by specific experimental settings, were shown to play an important modulating role in fMRIa. Here we examined the role of long-term expectations, based on 3D structural statistical regularities, in the modulation of fMRIa. To this end, human participants underwent fMRI scanning while performing a same--different task on pairs of possible (regular, expected) objects and spatially impossible (irregular, unexpected) objects. We hypothesized that given the spatial irregularity of impossible objects in relation to real-world visual experience, the visual system would always generate a prediction which is biased to the possible version of the objects. Consistently, fMRIa effects in the lateral occipital cortex (LOC) were found for possible, but not for impossible objects. Additionally, in alternating trials the order of stimulus presentation modulated LOC activity. That is, reduced activation was observed in trials in which the impossible version of the object served as the prime object (i.e. first object) and was followed by the possible version compared to the reverse order. These results were also supported by the behavioral advantage observed for trials that were primed by possible objects. Together, these findings strongly emphasize the importance of perceptual expectations in object representation and provide novel evidence for the role of real-world statistical regularities in eliciting fMRIa. Author Affiliation: Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva, Is
language: eng
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identifier: E-ISSN: 1095-9572 ; DOI: 10.1016/j.neuroimage.2015.07.085
fulltext: fulltext
issn:
  • 10959572
  • 1095-9572
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titleImpossible expectations: fMRI adaptation in the lateral occipital complex (LOC) is modulated by the statistical regularities of 3D structural information.
creatorFreud, Erez ; Ganel, Tzvi ; Avidan, Galia
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identifierE-ISSN: 1095-9572 ; DOI: 10.1016/j.neuroimage.2015.07.085
subjectAdaptation, Physiological–Physiology ; Adult–Physiology ; Brain Mapping–Physiology ; Female–Physiology ; Form Perception–Physiology ; Humans–Physiology ; Magnetic Resonance Imaging–Physiology ; Male–Physiology ; Occipital Lobe–Physiology ; Pattern Recognition, Visual–Physiology ; Statistics As Topic–Physiology ; Young Adult–Physiology ; Impossible Objects ; Object Recognition ; Perceptual Expectations ; Fmri Adaptation
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descriptionTo access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.neuroimage.2015.07.085 Byline: Erez Freud [erezfreud@gmail.coml] (*), Tzvi Ganel [ganelt@bgu.ac.il], Galia Avidan [galiaa@bgu.ac.il] Keywords fMRI adaptation; Impossible objects; Perceptual expectations; Object recognition Highlights * Possible, spatially expected objects elicited fMRI adaptation (fMRIa) effect in LOC. * Impossible, spatially unexpected objects did not elicit fMRIa effect in LOC. * Stimulus order modulated the activation profile in the alternated trials in LOC. * Real-world spatial statistical regularities play an important role in fMRIa. Abstract fMRI adaptation (fMRIa), the attenuation of fMRI signal which follows repeated presentation of a stimulus, is a well-documented phenomenon. Yet, the underlying neural mechanisms supporting this effect are not fully understood. Recently, short-term perceptual expectations, induced by specific experimental settings, were shown to play an important modulating role in fMRIa. Here we examined the role of long-term expectations, based on 3D structural statistical regularities, in the modulation of fMRIa. To this end, human participants underwent fMRI scanning while performing a same--different task on pairs of possible (regular, expected) objects and spatially impossible (irregular, unexpected) objects. We hypothesized that given the spatial irregularity of impossible objects in relation to real-world visual experience, the visual system would always generate a prediction which is biased to the possible version of the objects. Consistently, fMRIa effects in the lateral occipital cortex (LOC) were found for possible, but not for impossible objects. Additionally, in alternating trials the order of stimulus presentation modulated LOC activity. That is, reduced activation was observed in trials in which the impossible version of the object served as the prime object (i.e. first object) and was followed by the possible version compared to the reverse order. These results were also supported by the behavioral advantage observed for trials that were primed by possible objects. Together, these findings strongly emphasize the importance of perceptual expectations in object representation and provide novel evidence for the role of real-world statistical regularities in eliciting fMRIa. Author Affiliation: Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva, Israel Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva, Israel * Corresponding author at: Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel. Tel.: + 972 507757066; fax: + 972 8 6428518. Article History: Received 25 April 2015; Accepted 31 July 2015 (footnote)[white star] Conflict of interest: The authors declare no competing financial interests.
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