TY  - JOUR
PY  - 1993//
TI  - Optical specification of time-to-passage: observers' sensitivity to global tau
JO  - Journal of experimental psychology: human perception and performance
A1  - Kaiser, M. K.
A1  - Mowafy, L.
SP  - 1028
EP  - 1040
VL  - 19
IS  - 5
N2  - Despite its general mathematical formulation, most empirical work on the visual perception of tau (defined as a quantity divided by its temporal derivative) has focused on the case of direct approach, with tau defined as image angle/rate of expansion. Empirical investigators tend to generalize image size analyses to off-axis approaches. However, this generalization is inappropriate for all but a few classes of objects. After mathematically reestablishing the appropriate optical cues specifying time to passage for noncollision cases, we report a series of studies in which we examined observers' sensitivities to this information in both relative- and absolute-judgment paradigms. In general, we found observers' judgments to be accurate and robust.<p />  <p>Language: en</p>
LA  - en
SN  - 0096-1523
UR  - http://dx.doi.org/
ID  - ref1
ER  -