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Distinct time-courses of motion discrimination rate, AUC and perceptual awareness – as well as sensitivity and criterion – were also clearly visible when pooling the data for task performance instead of stimulus coherence (Supporting Figure S3).
The AUC increased with viewing time (main effect of urgency, p = 0.004), and remained always below the motion discrimination rate (main effect of task, p<0.001), until it saturated at the highest stimulus strength.
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This study has documented a higher performance in the motion discrimination task compared to the rating task.
Building upon past work [45], [46], [47], it might perhaps be possible to train monkeys to pair the motion discrimination response with a simplified rating task for perceptual awareness.
By exploiting the long integration time of noisy motion stimuli, and by forcing human observers to make difficult speeded decisions – sometimes a blind guess – about stimulus direction, we traced the temporal buildup of motion discrimination capability and perceptual awareness, as assessed trial by trial through direct rating.
b Shadow discrimination rate in Shopping Mall.
a Shadow discrimination rate in Highway I sequence.
c Shadow discrimination rate in "Sarvam" regional movie song.
The most commonly employed performance metrics are shadow detection rate and shadow discrimination rate introduced by Prati in [33].
Task differences may contribute to the superiority of motion discrimination.
In these trials, the discrimination rate (blue squares) was better than chance (always p<0.001 except in one case), but the rapid fading of invisibility implied that fully unconscious motion processing was short-lived.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com