Spatial Selectivity of Pattern Electroretinogram Components

Yoshii, Mitsunobu; Dodt, E.

doi:10.1159/000267036

Cited by 7 publications

(13 citation statements)

References 4 publications

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“…On the other hand, more reports exist to the contrary [23,[29][30][31][32][33]. Tan et al [34] and Yoshii and Dodt [35] reported the PERG check size function curve to be a low-pass fil ter shape in which the amplitudes showed an increase with the increase in check sizes. Korth [23] reported that with the onset pat tern mode, the spatial frequency tuning was observed especially in the high luminosity condition.…”

Section: Discussionmentioning

confidence: 99%

“…Korth [23] reported that with the onset pat tern mode, the spatial frequency tuning was observed especially in the high luminosity condition. Yoshii and Dodt [35] considered that the peak shift to larger check sizes in PERG is due to the influence of the lumi nance-related component. In our study, it was noteworthy that the spatial frequency tuning was observed only in the highest contrast (95%).…”

Section: Discussionmentioning

confidence: 99%

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Effect of Stimulus Contrast on Simultaneous Steady-State Pattern Reversal Electroretinogram and Visual Evoked Response

Tetsuka

Katsumi²,

Mehta³

et al. 1992

Ophthalmic Res

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We studied the effect of stimulus pattern contrast on the simultaneously recorded pattern reversal electroretinogram (PERG) and pattern reversal visual evoked response (PVER) at 5 check sizes. The stimulus contrast ranged from 24 to 95 % in 6 steps of 0.1- or 0.15-log unit increments. PERG amplitude showed a linear increase with an increase in pattern contrast at all check sizes. PVER amplitude showed an increase up to a certain pattern contrast, but was saturated upon further increase in stimulus contrast at all check sizes. The PERG amplitude-check size function curve showed a flattened, inverted-U shape only with the highest contrast and low-pass filter shape or flat shape with lower contrasts. The PVER amplitude-check size function curve showed an inverted-U shape (bandpass filter shape) at all contrasts. These characteristics to the changes in contrast and the spatial frequency tuning suggest that PVER is processed in a different location of visual pathway than PERG.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Stimulus Contrast on Simultaneous Steady-State Pattern Reversal Electroretinogram and Visual Evoked Response

Tetsuka

Katsumi²,

Mehta³

et al. 1992

Ophthalmic Res

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“…This decision was based on check size versus the P-ERG amplitude curve obtained in a similar stimulus condition [4,5]. Stimulus parameters were comparable for both pattern stimulus modes, except for the pattern configuration itself.…”

Section: Methodsmentioning

confidence: 99%

“…Since a small check size generally yields an even smaller P-ERG response, a larger check size is apt to be applied for clinical study of eye diseases. When we need to separate the contrast-related response from the luminance-related response, it is preferable to apply a pattern onset-offset mode of stimulation [3,4]. Pattern onset ERG at high contrast shows spatial selectivity at around 20 min of arc check size [4].…”

Section: Introductionmentioning

confidence: 99%

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Pattern Electroretinogram Elicited by a Dartboard Pattern

et al. 1998

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The receptive field size of retinal ganglion cells is closely related to their eccentricity from the fovea. To elicit larger pattern-reversal electroretinograms (P-ERGs), it may be useful to stimulate the retina with patterns having elements that parallel this change in receptive field size. We describe a dartboard pattern consisting of reversal elements that enlarge gradually from the central to the peripheral stimulus field. The utility of the dartboard pattern for eliciting P-ERG was investigated by comparing it with the conventional uniform checkerboard pattern, but with the other stimulus parameters remaining unchanged (96% contrast, 35.9 cd/m² mean luminance, 3.3 rev/s temporal frequency, 15° circular field). The dartboard pattern produced a significantly larger P50 amplitude than did the checkerboard pattern, while no difference in peak latency was found when 54 min of arc was used as a standard check size for the checkerboard pattern. The dartboard pattern for eliciting P-ERG should prove clinically useful.

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Luminance-unbalanced pattern onset-offset electroretinogram and visual evoked cortical potential

et al. 1991

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The effects of a luminance-unbalanced pattern onset-offset mode of stimulation on electroretinograms and visual evoked cortical potentials were investigated. With the use of originally devised software, only offset luminance was varied from 14.7 to 62.3 cd/m2. A vertical grating pattern (1.5 c/deg, 38.8 cd/m2 mean luminance, 0.95 contrast) was presented for 260 ms and was absent for 260 ms to normal subjects. With an increase in the luminance level of the offset pattern from the lowest level, the amplitude of the onset electroretinogram increased by degrees, while that of the offset electroretinogram gradually decreased. Conversely, onset visual evoked cortical potential responses decreased gradually, and offset visual evoked cortical potentials increased correspondingly. Furthermore, the spatial tuning of the onset pattern electroretinogram was already ambiguous, even when there was only a 4-cd/m2 difference between onset and offset pattern luminances. Thus, luminance control is indispensable for pattern onset-offset stimulation.

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Spatial Selectivity of Pattern Electroretinogram Components

Cited by 7 publications

References 4 publications

Effect of Stimulus Contrast on Simultaneous Steady-State Pattern Reversal Electroretinogram and Visual Evoked Response

Effect of Stimulus Contrast on Simultaneous Steady-State Pattern Reversal Electroretinogram and Visual Evoked Response

Pattern Electroretinogram Elicited by a Dartboard Pattern

Luminance-unbalanced pattern onset-offset electroretinogram and visual evoked cortical potential

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