The relationship between space and time in the perception of stimuli moving behind a slit.

Abstract:

:When a shape defined by a set of dots plotted along its contour is presented in a sequence of frames within the boundaries of a slit, and in each frame only one dot (featureless frame) or two dots (feature frame) are displayed, a whole moving dotted shape is perceived. Masking techniques and psychophysical measures have been used to show that a dynamic random-dot mask interferes with shape identification, provided the interframe interval is greater than about 15 ms, and there are no stimulus features for recognition in individual frames. A similar pattern of results was obtained when the observer had only to detect the movement of a single dot or a pair of dots against a dynamic-noise background. It is concluded that the visual system can resolve the correspondence problem in both apparent movement (one moving dot) and aperture viewing (featureless-frame condition) by extracting motion before the extraction of features in each frame. However, the results also show that where feature identification in each frame is possible, it can also be used to identify the moving targets.

journal_name

Perception

journal_title

Perception

authors

Casco C,Morgan M

doi

10.1068/p130429

subject

Has Abstract

pub_date

1984-01-01 00:00:00

pages

429-41

issue

4

eissn

0301-0066

issn

1468-4233

journal_volume

13

pub_type

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