Testing dynamical models of vision

Rüter, Johannes; Francis, Gregory; Frehe, Patricia; Herzog, Michael H.

doi:10.1016/j.visres.2010.11.013

Cited by 3 publications

(2 citation statements)

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“…However, if masked with a grating of seven or more straight lines, the vernier target is more easily perceived, and “shines through” the grating. The 3D-LAMINART (Grossberg, 1997 ; Francis, 2009 ) and WCTM (Herzog et al, 2003 ) computational models have been able to reproduce some but not all aspects of these phenomena (Rüter et al, 2011 ). 3D-LAMINART is a general purpose visual model that utilizes binocular vision to perceive the vernier target.…”

Section: Introductionmentioning

confidence: 99%

A computational investigation of feedforward and feedback processing in metacontrast backward masking

Silverstein

2015

Front. Psychol.

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In human perception studies, visual backward masking has been used to understand the temporal dynamics of subliminal vs. conscious perception. When a brief target stimulus is followed by a masking stimulus after a short interval of <100 ms, performance on the target is impaired when the target and mask are in close spatial proximity. While the psychophysical properties of backward masking have been studied extensively, there is still debate on the underlying cortical dynamics. One prevailing theory suggests that the impairment of target performance due to the mask is the result of lateral inhibition between the target and mask in feedforward processing. Another prevailing theory suggests that this impairment is due to the interruption of feedback processing of the target by the mask. This computational study demonstrates that both aspects of these theories may be correct. Using a biophysical model of V1 and V2, visual processing was modeled as interacting neocortical attractors, which must propagate up the visual stream. If an activating target attractor in V1 is quiesced enough with lateral inhibition from a mask, or not reinforced by recurrent feedback, it is more likely to burn out before becoming fully active and progressing through V2 and beyond. Results are presented which simulate metacontrast backward masking with an increasing stimulus interval and with the presence and absence of feedback activity. This showed that recurrent feedback diminishes backward masking effects and can make conscious perception more likely. One model configuration presented a metacontrast noise mask in the same hypercolumns as the target, and produced type-A masking. A second model configuration presented a target line with two parallel adjacent masking lines, and produced type-B masking. Future work should examine how the model extends to more complex spatial mask configurations.

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Section: Introductionmentioning

confidence: 99%

A computational investigation of feedforward and feedback processing in metacontrast backward masking

Silverstein

2015

Front. Psychol.

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“…However, purely spatial approaches to vision or purely temporal approaches to vision are insufficient, as they cannot be easily separated. 31 Furthermore, it has been argued that nontimed VA tests may not reflect the demands in activities of daily life. 32 Studies on visual processing speed in older adults have revealed that slower visual processing is related to an elevated risk of at-fault traffic accidents and decreased performance on other aspects of daily living (for an overview, see, e.g., Refs.…”

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confidence: 99%