Visual Processing of Object Velocity and Acceleration
Abstract
The human ability to discriminate small differences in velocity has been used to explore human motion processing. Velocity discrimination is independent of target contrast above a contrast of 2 -5%. A model based on the ratio of signals in two temporal mechanisms (sustained and transient) can explain this contrast independence at low contrast levels, but fails at high contrast levels. Human observers have difficulty detecting acceleration which may be due to physiological summation (integration) of the velocity signals from many motion sensors. Human observers cannot use disparity information to translate the angular velocity signal (deg/sec) into a precise estimate of objective velocity (cm/sec), a result that suggests that there is no mechanism for velocity constancy. Visual acuity, Vision.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1988
- Accession Number
- ADA205090
Entities
People
- Suzanne P. Mckee