Abstract
In four experiments we examined the nature of the information used in judging whether events would or would not give rise to a collision in the near future. Observers were tested in situations depicting approaches between two objects (lateral approaches) and approaches between an object and the point of observation (head-on approaches), with objects moving according to constant deceleration or sinusoidal deceleration patterns. Judgments were found to be based, to a large extent, on the (in)sufficiency of current deceleration to avoid upcoming collision, as specified optically by tau-dot (tau over dot). However, the information specified, by tau (tau), that is the current (first-order) time remaining until contact, was also found to play a significant role. We deduce that judgment of upcoming collision is based on the detection Of T and its evolution over time, suggesting that observers are sensitive to Deltatau rather than to tau over dot itself.
Original language | English |
---|---|
Pages (from-to) | 525-544 |
Number of pages | 20 |
Journal | Perception |
Volume | 32(5) |
Issue number | 5 |
Early online date | 23 Apr 2003 |
DOIs | |
Publication status | Published (in print/issue) - 1 May 2003 |