The visual system is exquisitely adapted to the task of extracting conceptual information from visual input with every new eye fixation, three or four times a second. Here we assess the minimum viewing time needed for visual comprehension, using rapid serial visual presentation (RSVP) of a series of six or 12 pictures presented at between 13 and 80 ms per picture, with no interstimulus interval. Participants were to detect a picture specified by a name (e.g., smiling couple) that was given just before or immediately after the sequence. Detection improved with increasing duration and was better when the name was presented before the sequence, but performance was significantly above chance at all durations, whether the target was named before or only after the sequence. The results are consistent with feedforward models, in which an initial wave of neural activity through the ventral stream is sufficient to allow identification of a complex visual stimulus in a single forward pass. Although we discuss other explanations, the results suggest that neither reentrant processing from higher to lower levels nor advance information about the stimulus is necessary for the conscious detection of rapidly presented, complex visual information.
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Because of the relatively large number of replaced participants in Experiment 2’s after group, we also ran the main d' analysis with the original 16 participants. Although d' was slightly lower with the original group than with the replaced participants, none of the significance levels changed, including the comparison with the before group.
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This research was supported by National Institutes of Health Grant No. MH47432. M.C.P. developed the study concept. All of the authors contributed to the study design. The testing, data collection, and data analysis were performed by E.S.M. and C.E.H. under the supervision of M.C.P. and B.W. M.C.P. drafted the article, and B.W. and C.E.H. provided critical revisions. All of the authors approved the final version of the article for submission. We thank Chidinma Egbukichi and Steven Yu for assistance.
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Potter, M.C., Wyble, B., Hagmann, C.E. et al. Detecting meaning in RSVP at 13 ms per picture. Atten Percept Psychophys 76, 270–279 (2014). https://doi.org/10.3758/s13414-013-0605-z
- Picture perception
- Feedforward processing
- Attentional set
- Conscious perception
- Conceptual processing