Neuronal correlates of perception in early visual cortex

David Ress, David J. Heeger

Research output: Contribution to journalArticlepeer-review


We used functional magnetic resonance imaging (fMRI) to measure activity in human early visual cortex (areas V1, V2 and V3) during a challenging contrast-detection task. Subjects attempted to detect the presence of slight contrast increments added to two kinds of background patterns. Behavioral responses were recorded so that the corresponding cortical activity could be grouped into the usual signal detection categories: hits, false alarms, misses and correct rejects. For both kinds of background patterns, the measured cortical activity was retinotopically specific. Hits and false alarms were associated with significantly more cortical activity than were correct rejects and misses. That false alarms evoked more activity than misses indicates that activity in early visual cortex corresponded to the subjects' percepts, rather than to the physically presented stimulus.

Original languageEnglish (US)
Pages (from-to)414-420
Number of pages7
JournalNature Neuroscience
Issue number4
StatePublished - Apr 1 2003

ASJC Scopus subject areas

  • General Neuroscience


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