Visual Evoked Potentials Under Varied Velocities of Continuous and Discrete Apparent Motion

Gallichio, J. A.; Andreassi, John L.

doi:10.3109/00207458208985920

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…Using a moving bar, Gallichio and Andreassi [129] report that both apparent motion and continuous motion (as approximated on a CRT screen) evoke similar responses. They found small differences, but these might originate from the inevitable physical differences between the stimuli rather than from fundamental difference between both stimulus types.…”

Section: Direction Bandwidthmentioning

confidence: 82%

A primer on motion visual evoked potentials

Heinrich¹

2007

Doc Ophthalmol

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Motion visual evoked potentials (motion VEPs) have been used since the late 1960s to investigate the properties of human visual motion processing, and continue to be a popular tool with a possible future in clinical diagnosis. This review first provides a synopsis of the characteristics of motion VEPs and then summarizes important methodological aspects. A subsequent overview illustrates how motion VEPs have been applied to study basic functions of human motion processing and shows perspectives for their use as a diagnostic tool.

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Section: Direction Bandwidthmentioning

confidence: 82%

A primer on motion visual evoked potentials

Heinrich¹

2007

Doc Ophthalmol

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“…(Speckmann & Caspers, 1979;Nunez, 1981). Up to now, research has concentrated on the transient components of the visually evoked potentials (VEPs) during motion onset, offset, and the reversal of motion direction (Callichio & Andreassi, 1982;Clarke, 1973a,6;Kuba & Kubova, 1992;Spekreisje et al, 1985;Victor & Conte, 1992;Wattam-Bell, 1991). It cannot be excluded that these responses are influenced by changes in the spatiotemporal statistics of the stimulus not specifically related to motion, such as the mere disappearance or appearance of the pattern during motion onset and offset, respectively.…”

Section: Introductionmentioning

confidence: 99%

Cortical potentials reflecting motion processing in humans

Patzwahl¹,

Zanker

Altenmüller³

1994

Vis Neurosci

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Motion processing is a fundamental task of visual systems, and in the monkey cortical areas can be identified which appear to be functionally specialized for motion processing. The human visual system is expected to be organized in a similar way. A noninvasive method to study the functional organization of the visual cortex is the recording of scalp potentials generated by neural activity of the underlying cortical areas. In the present study, we recorded slow cortical potentials from normal subjects in order to investigate how motion stimuli are processed. Three classes of object motion were realized as random dot kinematograms, namely Fourier motion, drift-balanced motion, and theta motion, because they require mechanisms of increasing complexity in order to be extracted. Large-field motion and counterphase flicker were used as control stimuli. Three basic results were obtained: (1) The responses evoked by the three classes of object motion do not differ significantly in their time course and distribution of activation.(2) The distributions of cortical activation evoked by object motion, and the control stimuli are different. During object motion the maximum activation occurs over the superior parietal cortex. Large-field motion activates occipital and parietal locations to the same extent, and during counterphase flicker the activity is maximum over the occipital lobe. Thus, the parietal slow potentials are interpreted to specifically reflect the cortical processing of object motion. (3) The time course of the activation reflects changes in the spatial position of the object: the amplitude of a transient negative component (TNC) which occurs 240 ms after motion onset decreases with increasing eccentricity of motion onset. The consecutive sustained negative component (SNC), which persists until the movement stops, decreases during centrifugal and increases during centripetal object motion. These results can be understood on the basis of physiological and anatomical knowledge about the mapping of the visual field on the cortex.

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Contrast dependence of motion-onset and pattern-reversal evoked potentials

Kubová

Kuba

Spekreijse³

et al. 1995

Vision Research

143

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This study deals with the effect of stimulus contrast, between 1.3% and 96%, on the visual evoked potentials (VEPs) for onset of motion and for pattern reversal of checkerboard stimuli. The VEPs for pattern reversal and for the onset of motion both contain an initial positive peak (P1; peak latency about 120 msec) followed by a later negative peak (N2; peak latency 160-200 msec). However the P1 peak dominates the pattern-reversal VEP when recorded from the midline occipital lead, where it is maximal, while the N2 peak is larger in the motion-onset VEP, especially when recorded from unipolar lateral occipital leads. Whereas the amplitude of the P1 peak in both the pattern-reversal VEP and the motion-onset VEP decreases with decreasing contrast (becoming undetectable at a contrast of about 2% for the motion-onset VEP), the amplitude of the N2 peak in both types of VEP does not vary significantly with contrast, above a contrast of 1.3%. The increase in peak latency with decreasing contrast is also more pronounced for the positive than the negative peaks of both types of VEP. Taking into account the high contrast sensitivity of the magnocellular system (thought to be involved in the processing of motion) compared with the parvocellular system (probably more concerned with the processing of form), our findings suggest that for both motion-onset and pattern-reversal VEPs the negative peak is attributable to the motion-processing magnocellular pathway and the positive peak to the form-processing parvocellular system.

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Visual Evoked Potentials Under Varied Velocities of Continuous and Discrete Apparent Motion

Cited by 7 publications

References 12 publications

A primer on motion visual evoked potentials

A primer on motion visual evoked potentials

Cortical potentials reflecting motion processing in humans

Contrast dependence of motion-onset and pattern-reversal evoked potentials

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