Perceived visual speed constrained by image segmentation

Article Abstract:

Parsing of the visual image into distinct entities most likely occurs as early as visual speed perception processes. Fusion and fission experiments are used to measure speed discrimination thresholds. Parsing effectively causes a single independent speed estimate per entity. Parsing significantly increases the threshold value from the divided to the occluded condition, irrespective of the identical moving regions in stimuli. Parsing of multiple patches on single surface alters speed perception. Local speed assemblies act in assemblies having long-range and neighboring interactions.

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Electrophysiological measurement of rapid shifts of attention during visual search

Article Abstract:

Behavioural studies of visual search do not provide a moment-by-moment measure of spatial distribution of attention. It is impossible in standard visual search protocols to determine the order in which objects are search, and it is therefore impossible to distinguish between attention-related shifts in the N2pc component and random voltage fluctuations. A modified visual search paradigms was used to solve this problem. The results rule out most of the parallel models where the overall distribution of attention does not move rapidly amongst items in the search array.

Attention (Psychology), Perception, Perception (Psychology), Attention

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Word meanings can be accessed but not reported during the attentional blink

Article Abstract:

Previous research has discovered that visual perception suffers from an attentional blink which lasts between 400-600 microseconds. During the attentional blink, target items are missed in a rapid stream of visual stimuli. Research has shown that the blink reflects a loss of information, rather than a suppression of perceptual processing. Tests conducted on the ability of a subject group of normal young adults to access word meanings confirmed such a hypothesis.

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