Conceptual size representation in ventral visual cortex

Shai Gabay, Eyal Kalanthroff, Avishai Henik, Nurit Gronau

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Recent findings suggest that visual objects may be mapped along the ventral occipitotemporal cortex according to their real-world size ( Konkle and Oliva, 2012). It has been argued that such mapping does not reflect an abstract, conceptual size representation, but rather the visual or functional properties associated with small versus big real-world objects. To determine whether a more abstract conceptual size representation may affect visual cortical activation we used meaningless geometrical shapes, devoid of semantic or functional associations, which were associated with specific size representations by virtue of extensive training. Following training, participants underwent functional magnetic resonance imaging (fMRI) scanning while performing a conceptual size comparison task on the geometrical shapes. In addition, a size comparison task was conducted for numeral digits denoting small and big numbers. A region-of-interest analysis revealed larger blood oxygenation level dependent (BOLD) responses for conceptually 'big' than for conceptually 'small' shapes, as well as for big versus small numbers, within medial (parahippocampal place area, PPA) and lateral (occipital place area, OPA) place-selective regions. Processing of the 'big' visual shapes further elicited enhanced activation in early visual cortex, possibly reflecting top-down projections from PPA. By using arbitrary shapes and numbers we minimized visual, categorical, or functional influences on fMRI measurement, providing evidence for a possible neural mechanism underlying the representation of abstract conceptual size within the ventral visual stream.

Original languageEnglish
Pages (from-to)198-206
Number of pages9
JournalNeuropsychologia
Volume81
DOIs
StatePublished - 29 Jan 2016

Keywords

  • Conceptual size
  • Numerical processing
  • Occipital place area
  • Parahippocampal place area
  • Size-preference

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience

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