Abstract
Contextual plasticity (CP) is a form of plasticity in sound localization induced by preceding stimulation. CP is observed as shifts in responses to a click stimulus when, on interleaved trials, the target click is preceded by an identical distractor click coming from a known location. This study examines temporal properties of CP by analyzing behavioral data from two previous experiments [Kopčo, Best, Shinn-Cunningham (2005), ARO Abstract #965; Tomoriová, Kopčo and Andoga (2010), ARO Abstract #827]. In the experiments, the distractor type (single click, train of 8 clicks, or noise), consistency (distractor type fixed within block vs. varying from trial to trial), and location (frontal vs. lateral) were manipulated. The results show that contextual plasticity buildup duration depends on the distractor location. Also, the buildup was stronger with 8-click distractor than 1-click distractor. When distractor type varied, the context type on immediately preceding trial influenced performance in the middle of the run, such that trials following an 8-click context exhibited shifts up to 5° larger than the trials following a 1-click context. No such bi-stable percept was observed in other parts of the run. These results show that CP has complex temporal profile on time scales of seconds to minutes. [Work supported by APVV-0452-12.]
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