Infant contrast detectors are selective for direction of motion

Vision Research
Karen R Dobkins, D Y Teller

Abstract

In order to investigate the presence of directionally selective mechanisms in 3-month-old infants, we employed a summation-near-threshold paradigm previously developed for studies of adult vision (Levinson & Sekuler, 1975 Journal of Physiology (London), 250, 347-366); Watson, Thompson, Murphy & Nachmias, 1980 Vision Research, 20, 341-347). The degree of contrast summation occurring between two sinusoidal gratings moving in opposite direction was determined by comparing the contrast threshold for a compound stimulus (a counterphase-reversing grating) with the contrast threshold for one of its components (a single moving grating). Using the forced-choice preferential looking (FPL) technique, contrast thresholds were obtained for both counterphase and single moving gratings within individual infant subjects. Data were collected at several speeds, ranging from 2.8 to 66.8 degrees/sec (temporal frequency range: 0.7-16.7 Hz). At slow speeds, infants' thresholds were approximately equal for counterphase and moving gratings, indicating that non-directional mechanisms were responsible for detection. At an intermediate speed (22.3 degrees/sec), thresholds were nearly twice as high for counterphase gratings as for single moving gratings, ...Continue Reading

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Citations

Jun 8, 2013·Documenta Ophthalmologica. Advances in Ophthalmology·Rain G BosworthKaren R Dobkins
Jun 30, 2011·Psychological Science·Faraz FarzinDavid Whitney
Aug 31, 2007·Infant Behavior & Development·Masami K YamaguchiHiromi Okamura
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