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Psychological and Brain Sciences Brown Bag Seminar: Darcy Waller

Wednesday, March 13, 2019 - 11:30am
Seashore Hall

Psychological and Brain Sciences Departmental Brown Bag Seminar

Darcy Waller, Psychological & Brain Sciences, The University of Iowa

"Signatures of Global Inhibition Following Infrequent but Expected Events"

Abstract: The fronto-basal ganglia system for global inhibition is a brain network that facilitates action stopping, but also interrupts ongoing motor and cognitive representations following unexpected perceptual events. Two signatures of this network’s engagement are broad corticospinal suppression and the frontocentral P3 event-related potential on the scalp. Using scalp EEG and ICA analyses, we have found preliminary evidence that this circuit is also recruited following expected but infrequent events. For this brownbag talk, I will discuss these EEG studies, some follow-up work using single-pulse transcranial magnetic stimulation (TMS) and electromyography (EMG), and some broader ideas and theories about why detection of infrequent events and motor inhibition appear to be tightly linked.