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- Title
α Power Modulation and Event-Related Slow Wave Provide Dissociable Correlates of Visual Working Memory.
- Authors
Fukuda, Keisuke; Mance, Irida; Vogel, Edward K.
- Abstract
Traditionally, electrophysiological correlates of visual working memory (VWM) capacity have been characterized using a lateralized VWMtask in which participants had to remember items presented on the cued hemifield while ignoring the distractors presented on the other hemifield. Though this approach revealed a lateralized parieto-occipital negative slow wave (i.e., the contralateral delay activity) and lateralizedα power modulation as neural correlates ofVWMcapacity that may be mechanistically related, recent evidence suggested that these measures might be reflecting individuals' ability to ignore distractors rather than their ability to maintain VWM representations. To better characterize the neural correlates ofVWMcapacity, we hadhumanparticipants perform a whole-fieldVWMtask in which they remembered all the items on the display. Here, we found that both the parieto-occipital negative slow wave and the α power suppression showed the characteristics of VWM capacity in the absence of distractors, suggesting that they reflect the maintenance of VWMrepresentations rather than filtering of distractors. Furthermore, the two signals explained unique portions of variance in individual differences ofVWMcapacity and showed differential temporal characteristics. This pattern of results clearly suggests that individual differences inVWMcapacity are determined by dissociable neural mechanisms reflected in theERPand the oscillatory measures ofVWM capacity.
- Subjects
SLOW wave structures; VISUAL memory; OSCILLATIONS; ELECTROPHYSIOLOGY; INDIVIDUAL differences; CRYSTALLIZED intelligence; MEMORY trace (Psychology)
- Publication
Journal of Neuroscience, 2015, Vol 35, Issue 41, p14009
- ISSN
0270-6474
- Publication type
Article
- DOI
10.1523/JNEUROSCI.5003-14.2015