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Dynamic spatial tuning of attentional focus in the attentional blink

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Title: Dynamic spatial tuning of attentional focus in the attentional blink
Author: Jefferies, Lisa N.
Degree Master of Arts - MA
Program Psychology
Copyright Date: 2005
Abstract: When two sequential targets (T1, T2) are inserted in an RSVP stream of distractors, perception of T2 is impaired at inter-target lags shorter than 700 ms. Paradoxically, this deficit disappears when T2 is presented directly after T1 (Lag-1 sparing). Visser et al. (1999) found that Lag-1 sparing occurs only when T1 and T2 are presented in the same stream. In contrast, Shih (2000) obtained Lag-1 sparing with targets in separate streams. Four experiments addressed this inconsistency and revealed Lag-1 sparing with targets in different streams, but only when observers had no foreknowledge of T1' s location. We hypothesized that when T1 location is known, the attentional spotlight is focused narrowly on that stream; if T2 then appears in the other stream it is missed, and Lag-1 sparing does not occur. When T1 location is not known, the spotlight is focused broadly, encompassing both streams, and Lag-1 sparing ensues.
URI: http://hdl.handle.net/2429/16841
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]

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