Integration of speed and time for estimating time to contact

Abstract

Significance Existing theories suggest that reacting to dynamic stimuli is made possible by relying on internal estimates of kinematic variables. For example, to catch a bouncing ball the brain relies on the position and speed of the ball. However, when kinematic information is unreliable one may additionally rely on temporal cues. In the bouncing ball example, when visibility is low one may benefit from the temporal information provided by the sound of the bounces. Our work provides evidence that humans rely on such temporal cues and automatically integrate them with kinematic information to optimize their performance. This finding reveals a hitherto unappreciated role of the brain’s timing mechanisms in sensorimotor function.

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