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.

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Figure 1: RDK with no added noise.

Related Publications:

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
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.

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