Form-From-Motion: MEG Evidence for Time Course and Processing Sequence
Journal of Cognitive Neuroscience
Brain Areas Specific for Attentional Load in a Motion-Tracking Task
Journal of Cognitive Neuroscience
The Role of Large-Scale Memory Organization in the Mismatch Negativity Event-Related Brain Potential
Journal of Cognitive Neuroscience
2006 Special Issue: Modeling attention to salient proto-objects
Neural Networks
Binding 3-d object perception in the human visual cortex
Journal of Cognitive Neuroscience
Neural measures of dynamic changes in attentive tracking load
Journal of Cognitive Neuroscience
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Human observers can readily track up to four independently moving items simultaneously, even in the presence of moving distractors. Here we combined EEG and magnetoencephalography recordings to investigate the neural processes underlying this remarkable capability. Participants were instructed to track four of eight independently moving items for 3 sec. When the movement ceased a probe stimulus consisting of four items with a higher luminance was presented. The location of the probe items could correspond fully, partly, or not at all with the tracked items. Participants reported whether the probe items fully matched the tracked items or not. About half of the participants showed slower RTs and higher error rates with increasing correspondence between tracked items and the probe. The other half, however, showed faster RTs and lower error rates when the probe fully matched the tracked items. This latter behavioral pattern was associated with enhanced probe-evoked neural activity that was localized to the lateral occipital cortex in the time range 170-210 msec. This enhanced response in the object-selective lateral occipital cortex suggested that these participants performed the tracking task by visualizing the overall shape configuration defined by the vertices of the tracked items, thereby producing a behavioral advantage on full-match trials. In a later time range 270-310 msec probe-evoked neural activity increased monotonically as a function of decreasing target-probe correspondence in all participants. This later modulation, localized to superior parietal cortex, was proposed to reflect the degree of mismatch between the probe and the automatically formed visual STM representation of the tracked items.