Neural representation of object orientation: A dissociation between MVPA and Repetition Suppression

Miles Hatfield, Michael McCloskey, Soojin Park

Research output: Contribution to journalArticlepeer-review

Abstract

How is object orientation represented in the brain? Behavioral error patterns reveal systematic tendencies to confuse certain orientations with one another. Using fMRI, we asked whether more confusable orientations are represented more similarly in object selective cortex (LOC). We compared two widely-used measures of neural similarity: multi-voxel pattern similarity (MVP-similarity) and Repetition Suppression. In LO, we found that multi-voxel pattern similarity was predicted by the confusability of two orientations. By contrast, Repetition Suppression effects in LO were unrelated to the confusability of orientations. To account for these differences between MVP-similarity and Repetition Suppression, we propose that MVP-similarity reflects the topographical distribution of neural populations, whereas Repetition Suppression depends on repeated activation of particular groups of neurons. This hypothesis leads to a unified interpretation of our results and may explain other dissociations between MVPA and Repetition Suppression observed in the literature.

Original languageEnglish (US)
Pages (from-to)136-148
Number of pages13
JournalNeuroImage
Volume139
DOIs
StatePublished - Oct 1 2016

Keywords

  • Lateral occipital complex
  • Multi-voxel pattern analysis
  • Object orientation
  • Repetition Suppression
  • Representational similarity

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

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