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Biomedical subjects

R N Aslin

Publications and source records attributed to R N Aslin.

41 records · Page 3Linked to original sources
PubMed1980

Assessment of stereopsis in human infants.

A new method for testing stereopsis in infants is described for use in the early assessment of binocular function. Four 6- and 12-month-old infants were presented with a dynamic random-element stereogram generated on a color television monitor. A stereoscopic form was moved laterally, either left or right, to elicit the visual attention of the infant. An observer, unaware of the direction of form movement, made a forced-choice judgment of the direction of form displacement based on information gleaned from observations of the infant's behavior. The observer's performance for all three age groups exceeded chance levels of responding (p < 0.001). Individual infants within each age group also provided strong evidence of stereopsis. The applicability of the method for the screening of binocular anomalies is discussed.

Age Factors↗
PubMed1980

Infant saccadic eye movements to visible and previously visible targets.

Recent evidence has shown that 1- and 2-month-old infants localize a peripheral target by means of a series of saccades. Step size in a series was directly related to target distance, but within a localizing series did not vary appreciably as the line of sight approached the target. The current study examined whether, during localization of a peripheral target, step size and number of steps were determined prior to the first saccade in a localizing series. 2-month-olds viewed peripheral targets which either remained on (continuous condition) or were extinguished (interrupted condition) prior to target localization. It was found that on the majority of trials a series of saccades was made toward the target hemifield. In both conditions the size of each saccade in a multiple saccadic series was approximately equal within a given trial, but varied with initial target distance. Multiple saccades on both continuous and interrupted trials were similar in form, differing only in the total extent of eye rotation. This suggests that a similar oculomotor program was operating under both conditions.

Eye Movements↗
PubMed1975

Sensitive period for the development of human binocular vision.

Twenty-four subjects with abnormal binocular experience, due to a condition of convergent strabismus that existed during different periods of their lives, were tested. Interocular transfer of the tilt-aftereffect was used to assess binocularity. Individuals between 1 and 3 years of age are most susceptible to abnormal binocular experience.

Adolescent↗