Centre-surround interactions in ageing human vision

Grant number: DP140100157 | Funding period: 2014 - 2017

Completed

Abstract

Australia has a rapidly ageing population. This project will study how ageing affects the visual perception of objects presented on non-uniform backgrounds. Our ability to discriminate objects from their backgrounds is key to most natural visual tasks. The visual processes involved are known as centre-surround interactions, and are considered fundamental building blocks to human perception. This project will significantly advance our knowledge of which spatial visual mechanisms are altered due to age, supplying key information for understanding and improving visual environments for the elderly, as well as increasing knowledge of the brain mechanisms susceptible to the ageing process.

Related publications (9)

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Orientation-dependency of perceptual surround suppression and orientation decoding of centre-surround stimuli are preserved with healthy ageing

Bao N Nguyen, Yu Man Chan, Stefan Bode, Allison M McKendrick

2020-11-01

A key visual neuronal property that is mirrored in human behaviour is centre-surround contrast suppression, which is orientation-d..

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Ageing elevates peripheral spatial suppression of motion regardless of divided attention

Soa Park, Bao N Nguyen, Allison M McKendrick

2020-02-20

PURPOSE: It is more difficult to perceive the direction of motion of larger, high contrast patterns than smaller, low contrast pat..

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Spatial vision in older adults: perceptual changes and neural bases

Allison M McKendrick, Yu Man Chan, Bao N Nguyen

2018-07-01

PURPOSE: The number of older adults is rapidly increasing internationally, leading to a significant increase in research on how he..

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Acute caffeine ingestion affects surround suppression of perceived contrast

Bao N Nguyen, Sui-Ann Hew, John Ly, Hee-Young Shin, Jessica C Wong, Emily Yeung, Allison M McKendrick

2018-01-01

Caffeine is a widely used psychostimulant that is associated with increased acetylcholine levels in mammalian brain and acetycholi..

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Mismatched summation mechanisms in older adults for the perception of small moving stimuli

Thomas J McDougall, Bao N Nguyen, Allison M McKendrick, David R Badcock

2018-01-01

Previous studies have found evidence for reduced cortical inhibition in aging visual cortex. Reduced inhibition could plausibly in..

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Visual Contextual Effects of Orientation, Contrast, Flicker, and Luminance: All Are Affected by Normal Aging

Bao N Nguyen, Allison M McKendrick

2016-04-18

The perception of a visual stimulus can be markedly altered by spatial interactions between the stimulus and its surround. For exa..

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Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions

Jonathan Denniss, Allison M McKendrick

2016-03-01

PURPOSE: Flicker-defined form (FDF) stimuli have recently been adopted for visual field testing. A key difference between FDF and ..

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Foveal and parafoveal contrast suppression are different: Mechanisms revealed by the study of healthy aging

Bao N Nguyen, Allison M McKendrick

2016-02-01

Visual contextual effects enable inference regarding neural mechanisms of cortical function, principally because of similarities b..

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Contrast and stimulus duration dependence of perceptual surround suppression in older adults

Renee Karas, Allison M McKendrick

2015-05-01

Most natural visual tasks involve the extraction of visual features from suprathreshold contrast backgrounds, hence an understandi..

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