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Psychonomic Seminar Series

Psychonomic Seminar Series
Friday, 23rd March 2007

The School of Psychology proudly presents:
The Psychonomic Seminar Series 2007
“Picking the anchovies of knowledge off the pizza of truth using the nose-hair tweezers of empiricism”
This coming Friday at 3pm in room 304, we are privileged to present Professor Jason Mattingley, who will give a special preview of a talk to be presented at the Australasian Experimental Psychology Conference in Canberra this April, entitled:
“Parietal Stimulation Destabilizes Spatial Updating across Saccadic Eye Movements”
Abstract: Saccadic eye movements cause sudden and global shifts in the retinal image. Rather than causing confusion, however, eye movements expand our sense of space and detail. In macaques, a stable representation of space is embodied by neural populations in intraparietal cortex that redistribute activity with each saccade to compensate for eye displacement, but little is known about equivalent updating mechanisms in humans. We combined non-invasive cortical stimulation with a double-step saccade task to examine the contribution of two human intraparietal areas to trans-saccadic spatial updating. Right hemisphere stimulation over the posterior termination of the intraparietal sulcus (IPSp) broadened and shifted the distribution of second saccade endpoints, but only when the first saccade was directed into the contralateral hemifield. By interleaving trials with and without cortical stimulation, we show that the shift in endpoints was caused by an enduring effect of stimulation on neural functioning (e.g. modulation of neuronal gain). By varying the onset time of stimulation, we show that the representation of space in IPSp is updated immediately after the first saccade. In contrast, stimulation of an adjacent IPS site had no such effects on second-saccades. These experiments suggest that stimulation of IPSp distorts an eye position or displacement signal that updates the representation of space at the completion of a saccade. Such

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Created: Monday, 19th March 2007 by windowl
Modified: Thursday, 5th August 2010 by admin
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