Revisiting the preview effect on object substitution masking

Chong, Kwong Voon (2012). Revisiting the preview effect on object substitution masking Honours Thesis, School of Psychology, The University of Queensland.

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Author Chong, Kwong Voon
Thesis Title Revisiting the preview effect on object substitution masking
School, Centre or Institute School of Psychology
Institution The University of Queensland
Publication date 2012-10-09
Thesis type Honours Thesis
Supervisor Paul Dux
Total pages 80
Language eng
Subjects 1701 Psychology
Abstract/Summary In Object Substitution Masking (OSM), participants are briefly presented (<100 ms) with a target and distractor search array with the target surrounded by cue that also acts as a mask. Typically this cue/mask consists of four dots and does not overlap the target spatially nor does it have similar contours to the target. When the target array offsets leaving only the mask, target identification is reduced or eliminated. To date, only one study has examined the benefit of having a preview of the target and distractor search array for several hundred ms prior to the target being cued (Guest, Gellately, & Pilling, 2012). These researchers found reduced masking under these conditions and ruled out the possibility that this effect could be due to loading information into visual short term memory, favouring an alternate account where preview facilitates target individuation. However, the presentation of this target and distractor search array would have also dispersed spatial attention, which typically leads to increased OSM. In six experiments, I tested these conflicting results and assessed the generalizability of the preview effect. The results demonstrate that benefit of the preview effect is abolished and even reversed when response time is controlled. In addition, this result extended across a range of stimulus parameters. Thus, the preview effect appears to occur at later stages of processing than individuation, most likely after response selection. These findings are discussed in relation to models of OSM.
Keyword Object substitution masking
Preview effect

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Created: Fri, 22 Feb 2013, 09:40:23 EST by Mrs Ann Lee on behalf of School of Psychology