10:30 - 12:00
Wed-H6-Talk 8--82
Wed-Talk 8
Room: H6
Chair/s:
Ekaterina Varkentin
Age-effects on eye and hand movement when intercepting moving targets
Wed-H6-Talk 8-8203
Presented by: Leonard Gerharz
Leonard GerharzDimitris Voudouris
Justus-Liebig-Universität Gießen
Catching a rolling egg before it falls off the table requires precise, synchronized hand and eye movements when anticipating the egg's path. However, both hand and eye movements are subject to sensorimotor delays, as they are based in part on sensory information obtained in the past. These sensorimotor delays may increase with age, reducing older adults` sensory sampling and requiring them to adjust their sensorimotor behavior accordingly. We examined how aging affects hand and eye movements when intercepting a moving object at a specific target area on screen. In a first experiment, younger and older healthy adults were required to intercept an unpredictable moving object with the exact target area being either of low (i.e., a disc) or high (i.e., a curved bar) spatial uncertainty. Hand and eye movements were moved generally later when the target area was of low spatial uncertainty. However, for both target areas, older adults shifted their hand and eye toward the target area systematically earlier than younger adults. In a second experiment, the object followed a straight and predictable path with the target areas remained identical. As expected, both groups moved their hand and eye toward the more predictable target areas prior to the first experiment. Again, older adults initiated these movements earlier than younger adults. In summary, eye movements are shifted toward the target location earlier when continuous visual sampling is less important. We associate aging with stronger proactive hand and eye movements, which may compensate for sensorimotor delays in manual actions.
Keywords: aging, eye-hand-coordination, prediction, uncertainty