Direction and extent of perceived motion smear during pursuit eye movement

Tong, Jianliang; Aydin, Murat; Bedell, Harold E.

doi:10.1016/j.visres.2006.12.002

Cited by 27 publications

(27 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This in turn means that motion opposite to the pursuit direction is selectively attenuated, leaving other directions unaffected. A similar pattern has been shown for perceived motion smear during pursuit (Bedell & Lott, 1996;Geisler, 1999;Tong, Aydin, & Bedell, 2007;Tong, Patel, & Bedell, 2005). These studies obtained that pursuit attenuates the perceived motion smear only for motion in the opposite direction, leaving motion in orthogonal direction unaffected.…”

Section: Comparison To Earlier Studiessupporting

confidence: 78%

Temporal contrast sensitivity during smooth pursuit eye movements

et al. 2007

View full text Add to dashboard Cite

During smooth pursuit eye movements, stimuli other than the pursuit target move across the retina, and this might affect their detectability. We measured detection thresholds for vertically oriented Gabor stimuli with different temporal frequencies (1, 4, 8, 12, 16, 20, and 24 Hz) of the sinusoids. Observers kept fixation on a small target spot that was either stationary or moved horizontally at a speed of 8 deg/s. The sinusoid of the Gabor stimuli moved either in the same or in the opposite direction as the pursuit target. Observers had to indicate whether the Gabor stimuli were displayed 4 degrees above or below the target spot. Results show that contrast sensitivity was mainly determined by retinal-image motion but was slightly reduced during smooth pursuit eye movements. Moreover, sensitivity for motion opposite to pursuit direction was reduced in comparison to motion in pursuit direction. The loss in sensitivity for peripheral targets during pursuit can be interpreted in terms of space-based attention to the pursuit target. The loss of sensitivity for motion opposite to pursuit direction can be interpreted as feature-based attention to the pursuit direction.

show abstract

Section: Comparison To Earlier Studiessupporting

confidence: 78%

Temporal contrast sensitivity during smooth pursuit eye movements

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Furthermore, in agreement with a previous finding that the reduction of subjective motion blur during pursuit is direction selective [15], [16], we also found the temporal resolution improvement during pursuit was direction selective. In this experiment, while the observer was making a pursuit, we presented the bars moving at a display speed twice as fast as the pursuit target (Figure 4 D).…”

Section: Resultssupporting

confidence: 93%

“…This motion deblur enhancement was only observed when the untracked target moved in the opposite direction of pursuit [15], [16]. Given that the motion deblur implies a reduction in signal mixture among spatially adjacent inputs, its enhancement during pursuit is consistent with our finding of increased temporal resolution.…”

Section: Discussionsupporting

confidence: 88%

Smooth Pursuit Eye Movements Improve Temporal Resolution for Color Perception

et al. 2010

View full text Add to dashboard Cite

Human observers see a single mixed color (yellow) when different colors (red and green) rapidly alternate. Accumulating evidence suggests that the critical temporal frequency beyond which chromatic fusion occurs does not simply reflect the temporal limit of peripheral encoding. However, it remains poorly understood how the central processing controls the fusion frequency. Here we show that the fusion frequency can be elevated by extra-retinal signals during smooth pursuit. This eye movement can keep the image of a moving target in the fovea, but it also introduces a backward retinal sweep of the stationary background pattern. We found that the fusion frequency was higher when retinal color changes were generated by pursuit-induced background motions than when the same retinal color changes were generated by object motions during eye fixation. This temporal improvement cannot be ascribed to a general increase in contrast gain of specific neural mechanisms during pursuit, since the improvement was not observed with a pattern flickering without changing position on the retina or with a pattern moving in the direction opposite to the background motion during pursuit. Our findings indicate that chromatic fusion is controlled by a cortical mechanism that suppresses motion blur. A plausible mechanism is that eye-movement signals change spatiotemporal trajectories along which color signals are integrated so as to reduce chromatic integration at the same locations (i.e., along stationary trajectories) on the retina that normally causes retinal blur during fixation.

show abstract

“…Another effect, which might be related to the temporal changes of luminance processing, is the selectively reduced extent of perceived motion smear during smooth pursuit for motion in the opposite direction (Bedell & Lott, 1996;Tong et al, 2005Tong et al, , 2007. As such, a suppression of motion smear also occurs during passive eye movements, and it has been concluded that the effect is at least partially caused by proprioceptive signals .…”

Section: Discussionmentioning

confidence: 99%

Improved visual sensitivity during smooth pursuit eye movements: Temporal and spatial characteristics

2009

View full text Add to dashboard Cite

Recently, we showed that contrast sensitivity for color and high-spatial frequency luminance stimuli is enhanced during smooth pursuit eye movements (Schütz et al., 2008). In this study, we investigated the enhancement over a wide range of temporal and spatial frequencies. In Experiment 1, we measured the temporal impulse response function (TIRF) for colored stimuli. The TIRF for pursuit and fixation differed mostly with respect to the gain but not with respect to the natural temporal frequency. Hence, the sensitivity enhancement seems to be rather independent of the temporal frequency of the stimuli. In Experiment 2, we measured the spatial contrast sensitivity function for luminance-defined Gabor patches with spatial frequencies ranging from 0.2 to 7 cpd. We found a sensitivity improvement during pursuit for spatial frequencies above 2-3 cpd. Between 0.5 and 3 cpd, sensitivity was impaired by smooth pursuit eye movements, but no consistent difference was observed below 0.5 cpd. The results of both experiments are consistent with an increased contrast gain of the parvocellular retinogeniculate pathway.

show abstract

Direction and extent of perceived motion smear during pursuit eye movement

Cited by 27 publications

References 50 publications

Temporal contrast sensitivity during smooth pursuit eye movements

Temporal contrast sensitivity during smooth pursuit eye movements

Smooth Pursuit Eye Movements Improve Temporal Resolution for Color Perception

Improved visual sensitivity during smooth pursuit eye movements: Temporal and spatial characteristics

Contact Info

Product

Resources

About