Abstract
The present paper describes a forced-choice preferential looking (FPL) technique, which has been used to assess visual capacities and visual development in infants up to five months of age. The technique is based on Fantz's (1965, 1967) preferential looking technique, combined with a forced-choice approach to data collection ( Blackwell, 1953 ; Bush, Galanter and Luce, 1963 ). The logic of FPL and its use as a working laboratory technique are presented and discussed in detail. Its use to date in psychophysical studies of the development of vision in both human and monkey infants, and in assessment of infant vision in the clinical setting are summarized; and limitations on the interpretation of results are briefly discussed.
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