Predictive eye movements when interacting with bouncing balls – age-related changes in the game 'Pong'
Mon—Casino_1.811—Poster1—2302
Presented by: Anna Schroeger
When interacting with moving objects, humans typically visually track those objects and make predictive gaze shifts to the anticipated object’s future location. For instance, when hitting a moving ball, people predictively look at the balls’ bouncing location, allowing them to overcome sensorimotor delays related to hitting the ball. Such delays become increasingly pronounced with age, possibly calling for stronger reliance on predictive gaze. To investigate whether aging prompts earlier gaze shifts to positions of interest, we examined gaze and hand movements of older and younger adults who played an iPad-based version of the game ‘Pong’ against an automated opponent. Participants moved a paddle of two different sizes on the bottom of the tablet to intercept a ball moving in two speeds and bouncing off walls. We were mainly interested in when participants looked i) at the wall where the ball bounced before moving toward the participants’ paddle, and ii) at their own paddle around interception. Both age groups hit fewer balls and looked earlier to the final wall bounce when using smaller paddles. Older participants looked later to the final wall bounce but earlier to their own paddle before interception compared to younger adults. Congruently, older adults performed less smooth pursuit shortly before interception. Together, these results suggest that aging enhances predictive gaze shifts related to the immediate action. Our results indicate that predictive gaze shifts become more pronounced when most needed, particularly during more difficult tasks, or in aging shortly before acting.
Keywords: eye movements, aging, motion prediction, interception