Interceptive timing: Prior knowledge matters

Joan López-Moliner, David T. Field, John P. Wann
2007 Journal of Vision  
Fast interceptive actions, such as catching a ball, rely upon accurate and precise information from vision. Recent models rely on flexible combinations of visual angle and its rate of expansion of which the tau parameter is a specific case. When an object approaches an observer, however, its trajectory may introduce bias into tau-like parameters that render these computations unacceptable as the sole source of information for actions. Here we show that observer knowledge of object size
more » ... bject size influences their action timing, and known size combined with image expansion simplifies the computations required to make interceptive actions and provides a route for experience to influence interceptive action.
doi:10.1167/7.13.11 pmid:17997639 fatcat:nyyihggvh5hq3guu62mq7zpwqe