INFANT EYE-MOVEMENT ASYMMETRIES - STATIONARY COUNTERPHASE GRATINGS ELICIT TEMPORAL-TO-NASAL OPTOKINETIC NYSTAGMUS IN 2-MONTH-OLD INFANTS UNDER MONOCULAR TEST CONDITIONS

被引:0
作者
TELLER, DY [1 ]
SUCCOP, A [1 ]
MAR, C [1 ]
机构
[1] UNIV WASHINGTON, DEPT PHYSIOL BIOPHYS, SEATTLE, WA 98195 USA
关键词
INFANT VISION; EYE MOVEMENTS; OPTOKINETIC NYSTAGMUS; MONOCULAR OPTOKINETIC NYSTAGMUS ASYMMETRIES; COUNTERPHASE GRATINGS; MOTION; MOTION NULLING; DIRECTION SELECTIVE NEURONS;
D O I
暂无
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Tested monocularly, young infants classically show directional eye movement asymmetries, with optokinetic nystagmus (OKN) being more readily elicited by stimuli moving in the temporal-to-nasal (T-N) than in the nasal-to-temporal (N-T) direction. Since a counterphase grating is physically identical to two superimposed sinusoidal components moving in opposite directions, we wondered whether or not a counterphase grating would elicit T-N OKN in monocularly tested infants. Two-month-old infants were tested in a motion nulling paradigm. Under monocular test conditions, all infants showed T-N OKN in response to the counterphase grating. The results suggest that the young infant's visual system represents the counterphase grating in terms of its T-N and N-T components, and reduces the effective contrast of the N-T component prior to the generation of OKN. The results are discussed in relation to models of OKN asymmetries and the responses of direction-selective neurons to counterphase gratings.
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页码:1859 / 1864
页数:6
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