Effect of laser eye protection devices on color perception.

Laser eye protection (LEP) devices may alter how colors are perceived in visual displays. This study investigates changes in color perception experienced by color-normal observers while wearing LEPs. Color perception with and without LEPs was measured using clinical color tests: City University Color Assessment and Diagnosis, Konan Medical ColorDx CCT-HD, and Farnsworth-Munsell 100-Hue.

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

Most natural visual tasks involve the extraction of visual features from suprathreshold contrast backgrounds, hence an understanding of how ageing impacts on contrast mechanisms is essential to understand elderly visual function. Previous studies have revealed increased perceptual surround suppression of contrast in older adults. We aimed to determine whether such age-related effects depend on the centre or surround stimulus contrast as the neurophysiological mechanisms underpinning contrast-contrast suppression depend on such contrast relationships.

Age related changes to perceptual surround suppression of moving stimuli.

Perceptual analogues of centre-surround suppression have been applied as indirect measures of cortical inhibitory function in several clinical disorders. Two tasks have been used: a centre-surround contrast perception task and a motion direction discrimination task, where the stimulus size and contrast is varied to measure surround suppression effects. The tasks are markedly different, yet previous literature implies that both measures indirectly assess inhibitory function and that results will be complementary.

Increased surround modulation of perceived contrast in the elderly.

Purpose: The appearance of a stimulus depends on its background, with high-contrast backgrounds resulting in lower perceived contrast. Increased perceptual surround suppression effects have been reported in the elderly. Our experiments tested whether enhanced surround suppression in the elderly arises because of age-dependent differences in brightness induction mechanisms that are sensitive to phase information at the border of the central stimulus.

Aging alters surround modulation of perceived contrast.

It is well established that many visual functions deteriorate with age. Perhaps counter-intuitively, a recent study revealed that older people actually require less time to discriminate the direction of motion of large, high contrast moving stimuli than young adults (L. R.