Abstract

Judgments of direction of motion were obtained for computer-generated motion-picture sequences of rectangles, trapezoids, circles, and ellipses rotating about a vertical axis and displayed at five perspectives, simulating viewing distances from infinity to close proximity to the figure. Accuracy ranged from 25% or less at the farthest perspective to close to 100% at the nearest perspective for rectangles and trapezoids. The Ames effect (perceived rotation of the rectangle and oscillation of the trapezoid) was found at intermediate perspectives. Rectangles and trapezoids were also generated with perspective variations in the horizontal or vertical dimensions only. Results for the vertical-perspective sequences were similar, but less accuracy was found for the other displays. With sufficiently close viewing distances, vertical-perspective changes resulting from rotary motion give rise to correct direction judgments but subjects resort to secondary information sources, such as relative sizes of vertical sides, when greater viewing distances render information from motion perspective ambiguous.

© 1968 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
New Theory on Apparent Movement

Martha J. Guastella
J. Opt. Soc. Am. 56(7) 960-966 (1966)

Dynamical use of different sources of information in heading judgments from retinal flow

Antje Grigo and Markus Lappe
J. Opt. Soc. Am. A 16(9) 2079-2091 (1999)

On Some Aspects of Real and Apparent Visual Movement*

C. H. Graham
J. Opt. Soc. Am. 53(9) 1019-1025 (1963)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (2)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (4)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription