Abstracts

Psychology and mental health

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Temporal oscillations in human perception

Article Abstract:

An experiment to assess whether perceptual decisions made by humans use discrete processing as opposed to continuous accumulation, found responses began following between four and seven stages of discrete processing. Reaction time distributions involved a periodic structure which could be described as fine grained, while oscillation periods tended to be linked to how difficult tasks were. The common assumption is that processing involves an important stochastic element, varying continuously. The research involved the study of 1,600 response times in four different tasks.

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Stimulus-onset asynchrony is not necessary for motion perception or metacontrast masking

Article Abstract:

Metacontrast masking and apparent motion are associated with visual stimuli seen in rapid succession and this research indicates that strict temporal succession is not essential for these perceptual phenomena to occur. Both phenomena were observed with two sequential frames occurring at the same time, so long as the second frame lasted longer than the first. These findings can be understood though using motion sensor computational models, but the findings do not back attempts to explain metacontrast masking through inhibitory theories.

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Object substitution: a new form of masking in unattended visual locations

Article Abstract:

Classical metacontrast and four-dot masking were compared to determine which is more accurate at a central display location. Experiments reveal that both masks significantly influence accuracy in parafoveal locations and that they are not affected by contour proximity. Experiments also show that four-dot masking may occur at central locations if attention is scattered between several targets.

Psychological aspects, Visual perception, Spatial analysis (Statistics)

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