Eyes offer a window into the mystery of humanconsciousness yale NatureComms
A, B). The static noise background appeared continuous from the onset of the pre-stimulus phase through the post-stimulus phase and was then replaced with a solid gray background in the response phase. The target stimulus could appear among one of three opacity conditions: no stimulus or blank , perceptual threshold , and fully opaque . The addition of fully opaque stimuli allowed measurement of participant false negative detection rate.
The center and quadrant location sets defined task-relevant and irrelevant stimulus conditions during the testing phase. In each testing session, participants were instructed that one location set was task-relevant while the other location set was task-irrelevant and testing sessions with different location instructions were conducted on different days. For example, on a day where the center stimuli were task-relevant, they were task-relevant for all trials in the session on that day.
The pre-stimulus, inter-stimulus, and post-stimulus trial phases were jittered intervals between 6 and 10 s during which participants were instructed to maintain fixation at all times . The first and second stimulus phases consisted of a 50 ms stimulus presentation, unless there was a blank presentation when no stimulus appeared. Finally, the response phase was self-paced and presented two sequential questions for stimuli in the task-relevant location set.
After completing all runs of the testing phase, participants were administered a free answer questionnaire that inquired on the general experiences during the study session, including whether if at any time during the testing phase the participants perceived stimuli in the task-irrelevant location set and how the opacity of these stimuli compared to the task-relevant stimuli.
The goal of this questionnaire was to offer a coarse assessment of what participants perceived during the testing phase, particularly for the task-irrelevant stimuli, which would later be used as the basis for a behavioral exclusion criterion for the Report + No-Report Paradigm, although this criterion resulted in no participant exclusions .
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