Academic journal article Attention, Perception and Psychophysics

The Spatiotemporal Integration Window

Academic journal article Attention, Perception and Psychophysics

The Spatiotemporal Integration Window

Article excerpt

FEATURE INTEGRATION The Spatiotemporal Integration Window Otto et al. (2009). Feature integration across space, time, and orientation. JEP:HPP, 35, 1670.

Our knowledge regarding feature integration across space has become extensive through many years of rigorous study, mainly with static stimuli. Much less is known, however, about feature integration across time with dynamic stimuli. Otto et al. present the sequential metacontrast paradigm, which has allowed them to carefully study feature integration across both space and time. The basic paradigm involves the presentation of a central pair of vertical lines that either are aligned or include a horizontal Vernier offset. The central pair is followed by a sequence of frames, each of which includes two such pairs of lines, one to the right and one to the left of center. The pairs of lines appear at growing distances from the center. This sequence of frames creates the illusion of two diagonal motion streams starting at the central pair and moving to the left and right. On some of the conditions, one of the peripheral pair of lines also includes an offset, and the direction of this flanking offset is always opposite that of the central offset. The task is to indicate the offset direction in one predefined stream. The findings suggest that although the flanking pairs of lines render the central pair invisible, as a result of metacontrast masking, when the central pair includes an offset it nevertheless affects the observers' judgments of offset direction. Specifically, the observers' judgments seem to be based on the combination of the central and flanking offsets. …

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