Infant pattern vision: a new approach based on the contrast sensitivity function.

Abstract Current approaches to the study of infant pattern vision have yielded interesting findings but have not yielded a set of data or principles from which general predictions can be drawn. We propose an alternative approach based on measurements of the contrast sensitivity function (CSF). This approach has been successfully applied to the study of adult vision. In principle, the approach allows one to predict the detectability of a wide variety of two-dimensional patterns if one knows the observer's CSF. Two experiments were conducted. In Experiment 1, CSFs of 1-, 2-, and 3-month infants were measured using a fixation preference paradigm. The results indicated noteworthy development between 1 and 3 months particularly in sensitivity to high spatial frequencies (fine stripes). The low-frequency attenuation characteristic of adult vision is observed at 2 and 3 months but not always at 1. In Experiment 2, CSFs of 2-month infants were measured at a lower luminance level. The results indicated that low-frequency attenuation became less pronounced as would be predicted if it were a manifestation of lateral inhibitory processing. The manner in which the CSF can be used to make general predictions is described. The CSFs of Experiment 1 are then used to successfully predict infants' detection of patterns used in two frequently cited experiments. We also propose a simple model of infant pattern preference and show that the model accurately predicts the results of a number of well-known experiments.

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