The threshold for conscious report: Signal loss and response bias in visual and frontal cortex

Bram Van Vugt, Bruno Dagnino, Devavrat Vartak, Houman Safaai, Stefano Panzeri, Stanislas Dehaene, Pieter R. Roelfsema*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Why are some visual stimuli consciously detected, whereas others remain subliminal? We investigated the fate of weak visual stimuli in the visual and frontal cortex of awake monkeys trained to report stimulus presence. Reported stimuli were associated with strong sustained activity in the frontal cortex, and frontal activity was weaker and quickly decayed for unreported stimuli. Information about weak stimuli could be lost at successive stages en route from the visual to the frontal cortex, and these propagation failures were confirmed through microstimulation of area V1. Fluctuations in response bias and sensitivity during perception of identical stimuli were traced back to prestimulus brain-state markers. A model in which stimuli become consciously reportable when they elicit a nonlinear ignition process in higher cortical areas explained our results.

Original languageEnglish
Pages (from-to)537-542
Number of pages6
JournalScience
Volume360
Issue number6388
DOIs
Publication statusPublished - 4 May 2018

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