Effect of Contrast on Fusional Visual Evoked Potential (VEP)

Katsumi, Osamu; Peli, Eli; Oguchi, Yoshihisa; Kawara, Tetsuo

doi:10.1097/00006324-198504000-00001

Cited by 6 publications

(5 citation statements)

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“…These researchers also noticed that when the central and the surrounding peripheral areas were stimulated simultaneously, the PVER from the peripheral area was suppressed by activity from the central area. Katsumi et al (1986) reported that the central 3.2 x 3.2-degree square elicited a greater PVER than the rest of the stimulus field (9.0 x 7.1 degrees) -results that agree with our present findings.…”

Section: Discussionsupporting

confidence: 93%

“…Lennerstrand (1978) was among the first to use this mode of stimulation when he investigated binocular interaction. By using FFT in addition to the method developed by Lennerstrand (1978), Katsumi et al (1985) studied binocular interaction and fusion. Yanashima (1982) used four frequency stimulations and FFT analysis for the quadrantic topographical analysis of the retina in an effort to objectively detect visual field defects.…”

Section: Discussionmentioning

confidence: 99%

“…Teping & Groneberg (1982 reported that a central, circular stimulus 4.0 degrees in diameter produced greater responses than the PVER induced by the rest of the stimulus field. Katsumi et al (1986), using a similar analytical method, found that the central 3.2 x 3.2-degree square stimulus field induced a greater PVER than that from the retina outside 3.2 x 3.2-degrees.…”

mentioning

confidence: 97%

“…The PVER depends greatly upon the activity of the central retina. Studies have been performed on the central and peripheral retina, mostly by changing the overall stimulus field size or covering a certain area of the central stimulus field (Rover et al 1980;Teping & Groneberg 1980;Katsumi et al 1986).…”

mentioning

confidence: 99%

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Topographical analysis of peripheral vs central retina with pattern reversal visual evoked response and the scanning laser ophthalmoscope

Katsumi

Velde

Mehta

et al. 1991

Acta Ophthalmologica

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The contribution of the central and the surrounding peripheral retina to the pattern reversal visual evoked response (PVER) was analyzed simultaneously using double frequency stimulation and the Fast Fourier transform (FFT) method. The Scanning Laser Ophthalmoscope (SLO) was used to project the pattern stimulus, a square subtending 10 degrees on a side, on a specific location in the fundus and to monitor accurately the stimulus' position during PVER testing. When the stimulus area on the central retina was less than or equal to 50 min of arc on a side, or 0.69% of the total area was stimulated (a square of 10 degrees on a side), the contribution from the central retina was negligible, and the PVER was dominated by surrounding peripheral retinal activity. When the stimulus area of the central retina was greater than or equal to 100 min of arc on a side, or 2.78% of the whole area was stimulated, activity from the central retina became more evident. When the stimulus area projected on the central retina became 150 min on a side (6.25% of the area or greater), activity from the central retina showed an increase and exceeded that of the peripheral retina. When the central area became larger, its activity dominated the PVER, and the contribution from the peripheral retina became negligible at this stage. The PVER was highly dependent upon the activity of the central retina, and activity levels from the central and surrounding peripheral retina were correlated.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 97%

mentioning

confidence: 99%

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Topographical analysis of peripheral vs central retina with pattern reversal visual evoked response and the scanning laser ophthalmoscope

Katsumi

Velde

Mehta

et al. 1991

Acta Ophthalmologica

Self Cite

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“…Fourier analysis of the frequency of EEG potentials evoked by that display revealed a component at the intermediate frequency, as well as components equal to the stimulation rates. Katsumi, Peli, Oguchi, and Kawara (1985) confirmed this and showed that a realizable neural network could accomplish such frequency fusion. Our observation of binocular temporal beats is noteworthy in that such beats are not seen when different spatial frequencies are viewed dichoptically (e.g., Blakemore, 1970).…”

Section: Discussionmentioning

confidence: 60%

Dichoptic temporal frequency differences do not lead to binocular rivalry

O’Shea¹,

Blake²

1986

Perception & Psychophysics

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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.

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Effect Of Prism Induced Heterophoria On Binocular Visual Evoked Potential

Shushtarian

Norouzi

2009

IFMBE Proceedings

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Effect of Contrast on Fusional Visual Evoked Potential (VEP)

Cited by 6 publications

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Topographical analysis of peripheral vs central retina with pattern reversal visual evoked response and the scanning laser ophthalmoscope

Topographical analysis of peripheral vs central retina with pattern reversal visual evoked response and the scanning laser ophthalmoscope

Dichoptic temporal frequency differences do not lead to binocular rivalry

Effect Of Prism Induced Heterophoria On Binocular Visual Evoked Potential

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