Perceptual shape sensitivity to upright and inverted faces is reflected in neuronal adaptation

Sharon Gilaie-Dotan, Hagar Gelbard-Sagiv, Rafael Malach

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

Using an fMR-adaptation paradigm for different face morphing levels we have recently demonstrated a narrow neuronal tuning to faces even at the sub-exemplar level which was tightly related to perceptual discrimination (Gilaie-Dotan and Malach, 2007). However, it is unclear whether this relationship is unique to faces or is a general property of object representations including unfamiliar objects, and whether the adaptation tuning is due to physical changes in the stimulus or to changes in perceptual discrimination. Here we compared the same face-morph paradigm for upright and inverted faces, thus modulating familiarity and perceptual discrimination effects while equating all low-level features. We found, as expected, a perceptual "inversion effect", i.e. a significant reduction in inverted face discrimination. Importantly, the fMR-adaptation tuning in the fusiform face area (FFA) changed in accordance with the different perceptual sensitivity both for upright and inverted faces. Additional object selective regions displayed differential tuning widths to the two categories. Our results are compatible with a model by which the ability of human observers to discriminate objects depends on the shape tuning properties of individual neurons.

Original languageEnglish
Pages (from-to)383-395
Number of pages13
JournalNeuroImage
Volume50
Issue number2
DOIs
StatePublished - 1 Apr 2010
Externally publishedYes

Bibliographical note

Funding Information:
We would like to thank Smadar Ovadia for help with brain reconstruction. This study was supported by the Israel Science Foundation 160/07 and Minerva grants to Rafael Malach. We thank the Computer Vision Laboratory, Faculty of Computer and Information Science, University of Ljubljana, Ljubljana, Slovenia, and the Secondary School Centre, Velenje, Slovenia, for allowing us to use the CVL Face Database ( http://www.lrv.fri.uni-lj.si/facedb.html ).

Keywords

  • Face perception
  • Human cortex
  • Object recognition
  • Ventral stream
  • fMRI

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