Visual Contrast Sensitivity

Kelly, D. H.

doi:10.1080/713819495

Cited by 248 publications

(121 citation statements)

References 30 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…These values are very similar to those reported in previous studies of typical individuals, including a peak in contrast sensitivity (peakSF) near 3 cpd and visual acuity (maxSF) near 40 cpd (e.g., Gwiazda, Bauer, Thorn, & Held, 1997;Kelly, 1977;Movshon & Kiorpes, 1988;Ridder, 2004;Robson, 1966;Virsu & Rovamo, 1979). Independent sample t-tests revealed no group difference in any of the four CSF measures.…”

Section: Csf Measuressupporting

confidence: 89%

“…These conditions can lead to rather noisy estimates of contrast threshold, making it difficult to notice small group differences. Second, because the maximum spatial frequency they tested (12.6 cpd) was well below visual acuity for humans (which is about 30-40 cpd, see Kelly, 1977;Ridder, 2004;Robson, 1966;Virsu & Rovamo, 1979), their data could not address differences between groups in visual acuity.…”

mentioning

confidence: 93%

See 1 more Smart Citation

Spatial Contrast Sensitivity in Adolescents with Autism Spectrum Disorders

Koh

Milne

Dobkins

2010

J Autism Dev Disord

View full text Add to dashboard Cite

Adolescents with Autism Spectrum Disorders (ASD) and typically developing (TD) controls underwent a rigorous psychophysical assessment that measured contrast sensitivity to seven spatial frequencies (0.5 to 20 cycles/degree). A contrast sensitivity function (CSF) was then fitted for each participant, from which four measures were obtained: visual acuity, peak spatial frequency, peak contrast sensitivity, and contrast sensitivity at a low spatial frequency. There were no group differences on any of the four CSF measures, indicating no differential spatial frequency processing in ASD.Although it has been suggested that detail-oriented visual perception in individuals with ASD may be a result of differential sensitivities to low vs. high spatial frequencies, the current study finds no evidence to support this hypothesis.

show abstract

Section: Csf Measuressupporting

confidence: 89%

mentioning

confidence: 93%

Spatial Contrast Sensitivity in Adolescents with Autism Spectrum Disorders

Koh

Milne

Dobkins

2010

J Autism Dev Disord

View full text Add to dashboard Cite

show abstract

“…Changes in flicker rate will alter the position of a stimulus on the spatiotemporal contrast sensitivity surface (Kelly, 1977). Apparent contrast will decrease for flicker rates lower than about 4 Hz, and hence such stimuli should dominate for less time (Blake, 1977).…”

Section: Resultsmentioning

confidence: 99%

Dichoptic temporal frequency differences do not lead to binocular rivalry

O’Shea¹,

Blake²

1986

Perception & Psychophysics

View full text Add to dashboard Cite

The influence of temporal modulation on binocular rivalry was examined in two ways. First, an uncontoured field viewed by one eye had its luminance sinusoidally modulated at 4 Hz (fullfield flicker). The other eye viewed a similar field that flickered at different temporal frequencies ranging from .5 to 16 Hz. Second, orthogonal sinusoidal dichoptic gratings were phase shifted so as to duplicate the range of temporal-frequency disparities presented with full-field flicker. Three subjects recorded exclusive visibility of the rival fields over 60-sec trials. Full-field flicker produced very few reports of rivalry, and was described as resembling "visual beats" or as an intermediate flicker rate. Usual amounts of rivalry were reported between orthogonal sine-wave gratings; the field flickering at low rates dominated less. These results were essentially confirmed in a second experiment, designed to minimize individual differences in response criteria by requiring subjects to respond to disappearances of small, dichoptic, nonrival markers superimposed on the rival fields. The markers disappeared in concert with episodes of rivalry suppression of the gratings, although disappearances were slightly briefer than supression durations. Disappearances of markers on full-field flicker were rare, extremely brief, and could be attributed to Troxler's fading rather than rivalry. The absence of rivalry between temporally disparate fullfield flicker suggests that rival interactions within transient mechanisms are minimal.

show abstract

“…With this protocol, blocks are alternately illuminated, so when flicker is perceived, it is at the scale of individual blocks. As we said earlier, sensitivity to high temporal frequencies decreases with increasing spatial frequency [5], and that decrease occurs at lower spatial frequencies in the periphery than in the fovea [18]. For these reasons, we expected that flicker would become more visible as block height increased and that the height producing flicker would be greater in the periphery than in the fovea.…”

Section: Methodsmentioning

confidence: 71%

“…The blocks in our technique subtend 1 arcmin for a fundamental frequency of 30 cpd. The visual system is much more sensitive to spatiotemporal variations at 0.2 cpd than to such variations at 30 cpd [5], so our technique should provide substantially better image quality and substantially fewer temporal artifacts than the RealD/Samsung technique. Fig.…”

Section: Introductionmentioning

confidence: 99%

Stereoscopic 3D display technique using spatiotemporal interlacing has improved spatial and temporal properties

Johnson¹,

Kim²,

Banks³

2015

Opt. Express

View full text Add to dashboard Cite

Stereoscopic 3D (S3D) displays use spatial or temporal interlacing to send different images to the two eyes. Temporal interlacing delivers images to the left and right eyes alternately in time; it has high effective spatial resolution but is prone to temporal artifacts. Spatial interlacing delivers even pixel rows to one eye and odd rows to the other eye simultaneously; it is subject to spatial limitations such as reduced spatial resolution. We propose a spatiotemporal-interlacing protocol that interlaces the left-and right-eye views spatially, but with the rows being delivered to each eye alternating with each frame. We performed psychophysical experiments and found that flicker, motion artifacts, and depth distortion are substantially reduced relative to the temporalinterlacing protocol, and spatial resolution is better than in the spatialinterlacing protocol. Thus, the spatiotemporal-interlacing protocol retains the benefits of spatial and temporal interlacing while minimizing or even eliminating the drawbacks.

show abstract

Visual Contrast Sensitivity

Cited by 248 publications

References 30 publications

Spatial Contrast Sensitivity in Adolescents with Autism Spectrum Disorders

Spatial Contrast Sensitivity in Adolescents with Autism Spectrum Disorders

Dichoptic temporal frequency differences do not lead to binocular rivalry

Stereoscopic 3D display technique using spatiotemporal interlacing has improved spatial and temporal properties

Contact Info

Product

Resources

About