Internal noise and sampling efficiency
Glass pattern with no added noise
In this project we explore the role of noise in processing of visual attributes such as motion (RDK, Figure 1) and shape perception by measuring thresholds at variable external noises. We use linear amplifier model of equivalent noise paradigm to seperate the performance into internal noise and sampling efficiency parameters in order to understand the limitiation in processing cluttered visual environment in clinical conditions such as amblyopia.
Figure 1: RDK with no added noise.
Related Publications:
Joshi, M. R, Simmers A. J., & Jeon S. T. (2021) The interaction of global motion and global form processing on the perception of implied motion: an equivalent noise approach. Vision Research, 61(5):58. [doi] [pdf]
Joshi, M. R., Simmers A. J., Jeon S. T. (2020) Implied motion from form shows motion aids the perception of global form in amblyopia." Investigative Ophthalmology and Visual Science, 61(5):58. [doi].
Joshi, M. R., Simmers A. J., Jeon S. T. (2016) Concurrent investigation of global motion and form processing in amblyopia: an equivalent noise approach." Investigative Ophthalmology and Visual Science, 57(11), 5015-5022. [doi].
Mahesh R Joshi
Lecturer in Optometry
My research interests include using psychophysical methods to investigate visual attributes such as motion and shape perception in normal and clinical populations.