Tuesday, November 6, 2007

Talk Announcement: Chi-Hung Juan

Dr. Chi-Hung Juan
Institute of Cognitive Neuroscience
National Central University, Taiwan

"Probing temporal and causal involvements of frontal eye fields in visual selection and saccade preparation with microstimulation and TMS."
Friday, Nov. 9th
SSPB 2214

The premotor theory of attention suggests that target processing and generation of a saccade to the target are interdependent. Temporally precise microstimulation and transcranial magnetic stimulation (TMS) was delivered over the monkey and human frontal eye fields, the area most frequently associated with the premotor theory in association with eye movements, while subjects performed a visually instructed pro-/anti-saccade task. Visual analysis and saccade preparation were clearly separated in time, as indicated by distinct time points of microstimulation and TMS delivery which resulted in elevated saccadic deviation and latencies. These results show that that visual analysis and saccade preparation can be dissociated temporally in the brain, notwithstanding any potential overlap of the anatomical areas involved.

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