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- Ekberg, Therese L., et al.
(författare)
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Dynamic reaching in infants during binocular and monocular viewing
- 2013
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Ingår i: Experimental Brain Research. - : Springer Science and Business Media LLC. - 0014-4819 .- 1432-1106. ; 229:1, s. 1-12
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Tidskriftsartikel (refereegranskat)abstract
- This study examined reaching in 6-, 8-, and 10-month-olds during binocular and monocular viewing in a dynamic reaching situation. Infants were rotated toward a flat vertical board and reached for objects at one of seven positions along a horizontal line at shoulder height. Hand selection, time to contact the object, and reaching accuracy were examined in both viewing conditions. Hand selection was strongly dependent on object location, not on infants' age or whether one eye was covered. Monocular viewing and age did, however, affect time to object contact and contact errors: Infants showed longer contact times when one eye was covered, and 6-month-olds made more contact errors in the monocular condition. For right-hand selection, contact times were longer when the covered right eye was leading during the chair rotation. For left-hand selection, there were no differences in contact time due to whether the covered eye was leading during rotation.
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| 2. |
- Soska, Kasey C., et al.
(författare)
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Infants plan prehension while pivoting
- 2019
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Ingår i: Developmental Psychobiology. - : John Wiley & Sons. - 0012-1630 .- 1098-2302. ; 61:7, s. 1048-1063
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Skilled object retrieval requires coordination of the perceptual and motor systems. Coordination is especially challenging when body position is changing and visual search is required to locate the target. In three experiments, we used a ?pivot paradigm? to induce changes in body position: Participants were passively pivoted 180° toward a target placed at varied locations to the left and right of the center of a reaching board. Experiment 1 showed that 6- to 15-month-old infants (n = 41) plan prehension so quickly that they retrieve targets mid-turn and scale their reaches to target location relative to turn direction. Experiment 2 characterized planning mid-turn reaching in 6- to 8-month-olds (n = 5) wearing a head-mounted eye tracker. Reach planning depended on when the target appeared in the field of view?not on target fixation. Experiment 3 used head-mounted eye tracking and motion tracking to assess perceptual?motor coordination in adults (n = 13). Adults displayed more mid-turn reaching than infants. But like infants, adults scaled reaching to target location relative to turn direction, and contact time depended on when the target came into view?not on target fixation. Findings show that fast, efficient perceptual?motor coordination supports flexibility in infant prehension, and constraints on coordination are similar across the lifespan.
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