Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

In preview search, half of the distracters are presented ahead of the remaining distracters and the target. Search under these conditions is more efficient than when all the items appear together (Watson & Humphreys, 1997). We investigated the mechanisms contributing to this preview benefit using an orientation discrimination task. In a display of vertical Gabors (all equidistant from fixation) one Gabor (chosen at random) was tilted (left or right). When half the non-tilted Gabors were previewed, thresholds increased less with the number of Gabors, relative to when all the Gabors appeared together (a preview benefit). In a further experiment, orientation noise was added to some of the Gabors. When all Gabors were presented simultaneously, orientation thresholds for the target increased. The effects of noise on thresholds was reduced, however, when the noisy Gabors were presented as a preview. Furthermore, there was less effect of noise in the preview condition than when observers were cued to a subset of Gabors (with a cue presented prior to the Gabors, adjacent to their positions). Visual information can be effectively excluded from the previewed locations to a greater degree than when attention is directed to a subset of display items. The implications for understanding the mechanisms involved in preview search are discussed.

Original publication

DOI

10.1016/j.visres.2006.11.007

Type

Journal article

Journal

Vision Res

Publication Date

03/2007

Volume

47

Pages

735 - 745

Keywords

Adult, Attention, Cues, Discrimination (Psychology), Field Dependence-Independence, Humans, Orientation, Pattern Recognition, Visual, Photic Stimulation, Psychophysics, Sensory Thresholds