Emergent Techniques for Assessment of Visual Performance (1985) / Chapter Skim
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TWO MODES OF VISUAL PROCESSING
TWO MODES OF VISUAL PROCESSING
Pages 25-28
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From page 25... ...
These studies should focus on finding the optimal test conditions giving the highest predictability of actual flight performance as well as other visual-motor tasks such as vehicular driving. TWO MODES OF VISUAL PROCESSING BACKGROUND Vision plays a role not only in the perception of objects but also in spatial orientation (maintenance of body posture, perception of self-motion, and locomotion)
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From page 26... ...
but play a much less important role in ambient vision. The low spatial frequencies subserving ambient vision are less sensitive to the degradation of retinal image quality by refractive error or by reduction of illumination.
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From page 27... ...
A critical factor is that traditional static perimetry makes use of a focal task requiring attention that can be redirected by the observer. Ambient vision seems largely to be reflexive and therefore may not be as susceptible to modification by attention shifts.
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From page 28... ...
Disruption of gaze stability mechanisms, either vestibular or optokinetic, when the head is in motion results in retinal image motion. Such inappropriate image movement lowers contrast and reduces spatial resolution.
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