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| Research article summary (published 30 Dec 1989): |
The effects of spatial phase on reaction time to spatially filtered images.
Full Abstract
Many studies of visual perception have used periodic stimuli such as sine-wave gratings and checkerboard patterns. It is well known that reaction time (RT) to such stimuli increases with increasing spatial frequency and decreasing contrast. While this is the case with periodic stimuli it is not clear that these relationships obtain for aperiodic stimuli such as natural scenes. A digitized image of an object (a vase) was submitted to two-dimensional Fourier analysis. Four pairs of spatial frequency band-limited images were created for each image. Each pair consisted of a normal-phase (NP) and a scrambled-phase (SP) version, with the magnitude spectrum and space-averaged luminance the same within each pair. Filter band-widths were 1 octave wide. Manual RT was measured for onset and offset of each spatially filtered image. Mean RT for SP images increased significantly with increasing spatial frequency, while no other significant differences were found with the NP images. This suggests that the temporal processing of complex, aperiodic images is influenced by the spatial frequency and contrast of local regions within the image, rather than by the space-averaged contrast of the entire image, and cannot be predicted by global estimates of contrast and spatial frequency.
Author information
Author/s: May, J G (JG); Brown, J M (JM); Gutierrez, C (C); Donlon, M (M);
Affiliation: Department of Psychology, University of New Orleans, Lakefront 70148.
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Psychological research (Psychol Res), published in GERMANY, WEST. (Language: eng)
Reference: 1990-; vol 52 (issue 1) : pp 22-7
Dates: Created 1990/09/04; Completed 1990/09/04; Revised 2006/11/15;
PMID: 2377721, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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