Psychophysical estimation of speed discrimination. II. Aging effects.

We studied the effects of aging on a speed discrimination task using a pair of first-order drifting luminance gratings. Two reference speeds of 2 and 8 deg/s were presented at stimulus durations of 500 ms and 1000 ms. The choice of stimulus parameters, etc., was determined in preliminary experiments and described in Part I. Thresholds were estimated using a two-alternative-forced-choice staircase methodology. Data were collected from 16 younger subjects (mean age 24 years) and 17 older subjects (mean age 71 years). Results showed that thresholds for speed discrimination were higher for the older age group. This was especially true at stimulus duration of 500 ms for both slower and faster speeds. This could be attributed to differences in temporal integration of speed with age. Visual acuity and contrast sensitivity were not statistically observed to mediate age differences in the speed discrimination thresholds. Gender differences were observed in the older age group, with older women having higher thresholds.

[1]  N W COPPINGER,et al.  The relationship between critical flicker frequency and chronologic age for varying levels of stimulus brightness. , 1955, Journal of gerontology.

[2]  Kathleen A. Turano,et al.  Speed discrimination under stabilized and normal viewing conditions , 1996, Vision Research.

[3]  S. Feldon,et al.  Age-related deterioration of motion perception and detection , 1998, Graefe's Archive for Clinical and Experimental Ophthalmology.

[4]  Charles W. Eriksen,et al.  Temporal factors in visual perception as related to aging , 1970 .

[5]  A. T. Smith.  Velocity perception and discrimination: Relation to temporal mechanisms , 1987, Vision Research.

[6]  P. Thompson.  Perceived rate of movement depends on contrast , 1982, Vision Research.

[7]  D. Kimura.  Sex differences in the brain. , 1992, Scientific American.

[8]  R. Pollack,et al.  Age differences in dark-interval threshold across the life-span. , 1979, Experimental aging research.

[9]  R. A. Mcfarland,et al.  Alterations in critical flicker frequency as a function of age and light: dark ratio. , 1958, Journal of experimental psychology.

[10]  P. Atchley,et al.  The effect of age, retinal eccentricity, and speed on the detection of optic flow components. , 1998, Psychology and aging.

[11]  A. G. Goldstein,et al.  Judgments of visual velocity as a function of length of observation time. , 1957, Journal of experimental psychology.

[12]  D Fucci,et al.  Temporal Resolution of the Aging Tactile Sensory System , 1989, Perceptual and motor skills.

[13]  H. Leibowitz,et al.  Age differences in estimating vehicle velocity. , 1991, Psychology and aging.

[14]  V. Portney,et al.  “Starkfest” Vision and Clinic Science Special Issue: The “Expected Visual Outcome” (EVO) Model Methodology and Clinical Validation , 1995, Optometry and Vision Science.

[15]  Brian J. Murphy,et al.  Pattern thresholds for moving and stationary gratings during smooth eye movement , 1978, Vision Research.

[16]  T. Salthouse.  A Theory of Cognitive Aging , 1985 .

[17]  S. McKee,et al.  The detection of motion in the peripheral visual field , 1984, Vision Research.

[18]  T. Stuve,et al.  Motion perception and aging. , 1992, Psychology and aging.

[19]  V. Di Lollo,et al.  Age-related changes in rate of visual information processing. , 1982, Journal of experimental psychology. Human perception and performance.

[20]  W Schiff,et al.  Information Used in Judging Impending Collision , 1979, Perception.

[21]  S. McKee,et al.  Precise velocity discrimination despite random variations in temporal frequency and contrast , 1986, Vision Research.

[22]  D W Kline,et al.  Age differences in backward monoptic visual noise masking. , 1975, Journal of gerontology.

[23]  D. A. Walsh,et al.  Age differences in central perceptual processing: a dichoptic backward masking investigation. , 1976, Journal of gerontology.

[24]  E. Maccoby,et al.  The Psychology of Sex Differences , 1974 .

[25]  P J Bex,et al.  Psychophysical evidence for a functional hierarchy of motion processing mechanisms. , 1998, Journal of the Optical Society of America. A, Optics, image science, and vision.

[26]  Dennis R. Proffitt,et al.  Judgments of natural and anomalous trajectories in the presence and absence of motion. , 1985 .

[27]  K. Gegenfurtner,et al.  Motion perception at scotopic light levels. , 2000, Journal of the Optical Society of America. A, Optics, image science, and vision.

[28]  P. Thompson,et al.  Contrast Affects Flicker and Speed Perception Differently , 1997, Vision Research.

[29]  R. E. Till,et al.  Age differences in peripheral perceptual processing: a monoptic backward masking investigation. , 1978, Journal of experimental psychology. Human perception and performance.

[30]  Peter Wenderoth,et al.  Adaptation to temporal modulation can enhance differential speed sensitivity , 1999, Vision Research.

[31]  A. Pantle,et al.  Temporal frequency response characteristic of motion channels measured with three different psychophysical techniques , 1978, Perception & psychophysics.

[32]  J. Brannan.  Changes in Temporal Visual Processing in Normal Aging , 1992 .

[33]  G A Orban,et al.  Velocity discrimination in central and peripheral visual field. , 1985, Journal of the Optical Society of America. A, Optics and image science.

[34]  A. T. Smith,et al.  The influence of spatial frequency on perceived temporal frequency and perceived speed , 1990, Vision Research.

[35]  H. Bekkering,et al.  Motion thresholds of briefly visible stimuli increase asymmetrically with age , 1992, Vision Research.

[36]  J. Pellegrino,et al.  Perceptual and cognitive factors governing performance in comparative arrival-time judgments. , 1993, Journal of experimental psychology. Human perception and performance.

[37]  D. Levi,et al.  Stimulus uncertainty affects velocity discrimination , 1998, Vision Research.

[38]  B. Brown,et al.  Sensitivity to Changes in Size and Velocity in Young and Elderly Observers , 1987, Perception.

[39]  R. Leigh,et al.  The neurology of eye movements , 1984 .

[40]  E. Wist,et al.  The spatial frequency effect on perceived velocity , 1976, Vision Research.

[41]  A. Wingfield,et al.  Speed of processing in normal aging: effects of speech rate, linguistic structure, and processing time. , 1985, Journal of gerontology.

[42]  S. Lehmkuhle,et al.  Clinical implications of parallel visual pathways. , 1990, Journal of the American Optometric Association.

[43]  D. Grantham,et al.  Temporal processing in the aging auditory system. , 1998, The Journal of the Acoustical Society of America.

[44]  H. Ross,et al.  Optic-Flow and Cognitive Factors in Time-to-Collision Estimates , 1983, Perception.

[45]  G. Orban,et al.  Factors influencing velocity coding in the human visual system , 1984, Vision Research.

[46]  P. Thompson,et al.  Human speed perception is contrast dependent , 1992, Vision Research.

[47]  J. Norman,et al.  Aging and the Perception of Speed , 2003, Perception.

[48]  S. McKee.  A local mechanism for differential velocity detection , 1981, Vision Research.

[49]  J. Birren,et al.  Speed of Behavior as an Indicator of Age Changes and the Integrity of the Nervous System , 1979 .

[50]  L. Thompson,et al.  Effects of senescence on the temporal resolution of somesthetic stimuli presented to one hand or both. , 1968, Journal of gerontology.