Abstract
Using five capital letters as the form stimuli and tachistoscopic presentation, an exposure duration was determined for each S that yielded 80% identification accuracy when single letter displays were presented. Then the increment in exposure duration necessary for a correct identification of all letters on a display on 80% of the trials was determined for 2, 3, and 4 letter displays. In view of evidence that perceptual independence breaks down when stimuli are spaced much closer than 1° apart in the fovea, the effect of different foveal spacing of the form stimuli in the display was studied. Spacings of 1/2, 3/4, and 1° of angle were employed. Less than a 30% increment in exposure duration was necessary to recognize 2 form displays at the same accuracy level as single form. But no further increase in exposure duration was necessary to recognize 3 and 4 form displays at the same accuracy criterion. Evidence for positive correlation of sensory perceptual error for forms spaced less than 1° apart in the fovea was found.
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This investigation was supported by Public Health Service Research Grant MH-1206 and a Public Health Service Research Career Program Award K6-MH-22,014.
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Collins, J.F., Eriksen, C.W. The perception of multiple simultaneously presented forms as a function of foveal spacing. Perception & Psychophysics 2, 369–373 (1967). https://doi.org/10.3758/BF03210073
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DOI: https://doi.org/10.3758/BF03210073