Motion-contrast sensitivity: visibility of motion gradients of various spatial frequencies

Watson, Andrew B.; Eckert, Michael P.

doi:10.1364/josaa.11.000496

Cited by 53 publications

(43 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The functions cluster into two groups: a first-order group with large max gain and high peak spatial frequency and a second-order one with smaller gain and reduced peak frequency. This result is consistent with previous studies in terms of the shape of the first-order contrast sensitivity function (Campbell & Robson, 1968), the shape of the second-order contrast sensitivity functions Landy & Oruc, 2002;Meso & Hess, 2010Schofield & Georgeson, 2003;Sutter, Sperling, & Chubb, 1995;Watson & Eckert, 1994) and the higher sensitivity to first-order stimuli than that to second-order stimuli Sutter, Sperling, & Chubb, 1995). Second, although the shapes of the sensitivity functions of the NAE and the AE are similar, the gain and the peak frequency are higher in NAE than in the AE for both first-order and second-order sensitivity functions.…”

Section: Resultssupporting

confidence: 93%

The amblyopic deficit for 2nd order processing: Generality and laterality

et al. 2015

View full text Add to dashboard Cite

A number of previous reports have suggested that the processing of second-order stimuli by the amblyopic eye (AE) is defective and that the fellow non-amblyopic eye (NAE) also exhibits an anomaly. Second-order stimuli involve extra-striate as well as striate processing and provide a means of exploring the extent of the cortical anomaly in amblyopia using psychophysics. We use a range of different second-order stimuli to investigate how general the deficit is for detecting second-order stimuli in adult amblyopes. We compare these results to our previously published adult normative database using the same stimuli and approach to determine the extent to which the detection of these stimuli is defective for both amblyopic and non-amblyopic eye stimulation. The results suggest that the second-order deficit affects a wide range of second-order stimuli, and by implication a large area of extra-striate cortex, both dorsally and ventrally. The NAE is affected only in motion-defined form judgments, suggesting a difference in the degree to which ocular dominance is disrupted in dorsal and ventral extra-striate regions.

show abstract

Section: Resultssupporting

confidence: 93%

The amblyopic deficit for 2nd order processing: Generality and laterality

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Recent studies have delineated the modulation sensitivity of a number of second-order mechanisms, namely contrastmodulated (Jamar and Koenderink 1985;Schofield and Georgeson 1999;Sutter et al 1995), motion-modulated (Meso and Hess 2010;Watson and Eckert 1994), spatial frequency-modulated (Arsenault et al 1999), and orientation-modulated (Kingdom et al 1995;Landy and Oruç 2002;Meso and Hess 2011b). The filter properties could be related specifically to the second-order stimuli.…”

Section: Introductionmentioning

confidence: 99%

Properties of spatial channels underlying the detection of orientation-modulations

Reynaud

Hess

2012

Exp Brain Res

View full text Add to dashboard Cite

Orientation-modulated stimuli are thought to be processed via a two-stage process, the first stage involving the detection of the carrier by mechanisms in striate cortex and the second stage involving the detection of the modulation by way of integration of carrier-based information by mechanisms in extra-striate cortex. Much is known about the spatial properties of the channels underlying carrier detection but less is known about the properties of the channels involved in modulation detection. Using a discrimination at detection paradigm, we show that the mechanisms underlying modulation detection are tuned for envelope spatial frequency and orientation. The tuning of these channels is not substantially different from that previously described for carrier mechanisms, namely 1-2 octaves for spatial frequency and 30° for orientation. For orientation, these stimuli exhibit an oblique effect that is dependent on absolute carrier orientation, suggesting facilitative interactions between first- and second-stage processes.

show abstract

“…The decrease in perceived shift with the higher spatial frequency motion carrier reflects that motion contours are less easily perceived (Watson & Eckert 1994). The size of the perceived shift increased with the saliency of motion of motion-defined contours, suggesting that it was related to the magnitude of this higher order motion signal.…”

Section: Discussionmentioning

confidence: 97%

The movement of motion-defined contours can bias perceived position

Durant

Zanker

2009

Biol. Lett.

View full text Add to dashboard Cite

Illusory position shifts induced by motion suggest that motion processing can interfere with perceived position. This may be because accurate position representation is lost during successive visual processing steps. We found that complex motion patterns, which can only be extracted at a global level by pooling and segmenting local motion signals and integrating over time, can influence perceived position. We used motion-defined Gabor patterns containing motion-defined boundaries, which themselves moved over time. This ‘motion-defined motion’ induced position biases of up to 0.5°, much larger than has been found with luminance-defined motion. The size of the shift correlated with how detectable the motion-defined motion direction was, suggesting that the amount of bias increased with the magnitude of this complex directional signal. However, positional shifts did occur even when participants were not aware of the direction of the motion-defined motion. The size of the perceptual position shift was greatly reduced when the position judgement was made relative to the location of a static luminance-defined square, but not eliminated. These results suggest that motion-induced position shifts are a result of general mechanisms matching dynamic object properties with spatial location.

show abstract

Motion-contrast sensitivity: visibility of motion gradients of various spatial frequencies

Cited by 53 publications

References 32 publications

The amblyopic deficit for 2nd order processing: Generality and laterality

The amblyopic deficit for 2nd order processing: Generality and laterality

Properties of spatial channels underlying the detection of orientation-modulations

The movement of motion-defined contours can bias perceived position

Contact Info

Product

Resources

About