par Windey, Bert 
Référence ESCoP (October 2011: San Sebastian, Spain)
Publication Non publié, 2011-10-01
Référence ESCoP (October 2011: San Sebastian, Spain)
Publication Non publié, 2011-10-01
Poster de conférence
| Résumé : | This experiment aims to shed light on an ongoing controverse in the visual awareness literature. One aspect of the debate between the Global Workspace Theory and the Recurrent Processing Hypothesis is how the transition from unconscious processing to a conscious experience takes place. When postmasked stimuli are shown for parametrically varied durations, the former assumes an all-or-none transition (stimuli remain unconscious until the presentation duration is sufficient to generate a sudden clear experience), whereas the latter assumes a graded transition (the longer the presentation time, the gradually better the visibility). Here we intend to bring the two theories and their supporting evidence together, by taking the level of processing of stimuli into account. Participants performed a low-level (categorizing colored patches as red or blue) or a high-level task (categorizing numbers as smaller or larger than 5). Postmasked stimuli were presented for 10 ms up to 80 ms in steps of 10 ms. The psychophysical detection curve for the low-level task showed a graded pattern. The curve for the high-level task showed an all-or-none pattern. We hypothesize that high-level stimuli require access to a global workspace, whereas low-level stimuli can become conscious due to more posterior processing. |
