From Perception to Conception: How Meaningful Objects Are Processed over Time

Alex Clarke, Kirsten I. Taylor, Barry Devereux, Billi Randall, Lorraine K. Tyler

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

To recognize visual objects, our sensory perceptions are transformed through dynamic neural interactions into meaningful representations of the world but exactly how visual inputs invoke object meaning remains unclear. To address this issue, we apply a regression approach to magnetoencephalography data, modeling perceptual and conceptual variables. Key conceptual measures were derived from semantic feature–based models claiming shared features (e.g., has eyes) provide broad category information, while distinctive features (e.g., has a hump) are additionally required for more specific object identification. Our results show initial perceptual effects in visual cortex that are rapidly followed by semantic feature effects throughout ventral temporal cortex within the first 120 ms. Moreover, these early semantic effects reflect shared semantic feature information supporting coarse category-type distinctions. Post-200 ms, we observed the effects along the extent of ventral temporal cortex for both shared and distinctive features, which together allow for conceptual differentiation and object identification. By relating spatiotemporal neural activity to statistical feature–based measures of semantic knowledge, we demonstrate that qualitatively different kinds of perceptual and semantic information are extracted from visual objects over time, with rapid activation of shared object features followed by concomitant activation of distinctive features that together enable meaningful visual object recognition.
Original languageEnglish
Pages (from-to)187-197
Number of pages11
JournalCerebral Cortex
Volume23
Issue number1
Early online date23 Jan 2012
DOIs
Publication statusPublished - 01 Jan 2013
Externally publishedYes

Bibliographical note

00000 PMID: 22275484 bibtex: clarke2013

Keywords

  • Object Recognition, feature-based statistics, multiple regression, semantic knowledge, Magnetoencephalography

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