کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6256678 | 1612942 | 2015 | 9 صفحه PDF | دانلود رایگان |
- The timecourse of conscious and nonconscious visual sensory memory effects.
- Visual sensory source memory and item memory effects are temporally distinct.
- The rapid onset of visual sensory item memory effects.
Previous event-related potential (ERP) findings have suggested that during visual item and source memory, nonconscious and conscious sensory (occipital-temporal) activity onsets may be restricted to early (0-800Â ms) and late (800-1600Â ms) temporal epochs, respectively. In an ERP experiment, we tested this hypothesis by separately assessing whether the onset of conscious sensory activity was restricted to the late epoch during source (location) memory and item (shape) memory. We found that conscious sensory activity had a late (>800Â ms) onset during source memory and an early (<200Â ms) onset during item memory. In a follow-up fMRI experiment, conscious sensory activity was localized to BA17, BA18, and BA19. Of primary importance, the distinct source memory and item memory ERP onsets contradict the hypothesis that there is a fixed temporal boundary separating nonconscious and conscious processing during all forms of visual conscious retrieval.
Journal: Behavioural Brain Research - Volume 290, 1 September 2015, Pages 143-151