other roles of intraparietal sulcus
Suppression of irrelevant stimuli is a rather new role for intraparietal sulcus. In the past, this region has been associated with feature integration and with shifting of attention.

Our results can be unified with these other findings if we assume a model in which signals from feature detectors and spatial maps converge within intraparietal sulcus and become associated with objects, each of which can be suppressed or enabled according to some attentional control signal.

This control may originate from other areas associated with attention in frontal lobe and cerebellum.

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`Physiological Studies of Attention in Autism: Implications for Autistic Cognition and Behaviour', Matthew Belmonte, 26 January 2002