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We propose and simulate, with a dynamic neural field model, two mechanisms underlying inhibition of return (IOR) in the oculomotor system: sensory and motor. Reflecting sensory adaptation (or habituation) repeated visual stimulation results in a reduction of visual input to the superior colliculus (SC); consequently, saccades to targets which appear at previously stimulated locations will have longer latencies than those which appear at unstimulated locations. In contrast, the execution of a saccade results in asymmetric activation in the SC; consequently, saccades which reverse vectors will have longer latencies than those which repeat vectors. In the IOR literature, these two mechanisms correspond to IOR effects observed following covert exogenous orienting and overt orienting in the absence of peripheral stimulation, respectively. We predict that these two independent mechanisms will have additive effects; a prediction that is confirmed in a behavioral experiment.

Item Type:	Conference Extract
Keywords:	attention
Research Division:	Psychology
Research Group:	Cognitive and computational psychology
Research Field:	Memory and attention
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in psychology
UTAS Author:	Satel, J (Dr Jason Satel)
ID Code:	119185
Year Published:	2011
Deposited By:	Psychology
Deposited On:	2017-07-27
Last Modified:	2017-09-11
Downloads:	0