Effects of Two Anticholinergic Drugs on Electroretinograms and Visual Evoked Potentials in Healthy Human Subjects

1990 ◽  
Vol 24 (4) ◽  
pp. 205-209 ◽  
Author(s):  
Peter Bartel ◽  
Marie Blom ◽  
Elna Robinson ◽  
C. van der Meyden ◽  
Klerk Sommers ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Human Subjects ◽  
Anticholinergic Drugs ◽  
Healthy Human ◽  
Healthy Human Subjects ◽  
Visual Evoked

Contrast response of temporally sparse dichoptic multifocal visual evoked potentials

2005 ◽  
Vol 22 (2) ◽  
pp. 153-162 ◽  
Author(s):  
TED MADDESS ◽  
ANDREW CHARLES JAMES ◽  
ELIZABETH ANNE BOWMAN
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Human Subjects ◽  
Response Functions ◽  
Signal To Noise ◽  
Recording Time ◽  
Contrast Gain ◽  
Multifocal Visual Evoked Potentials ◽  
Contrast Response ◽  
Visual Evoked

Temporally sparse stimuli have been found to produce larger multifocal visual evoked potentials than rapid contrast-reversal stimuli. We compared the contrast-response functions of conventional contrast-reversing (CR) stimuli and three grades of temporally sparse stimuli, examining both the changes in response amplitude and signal-to-noise ratio (SNR). All stimuli were presented dichoptically to normal adult human subjects. One stimulus variant, the slowest pattern pulse, had interleaved monocular and binocular stimuli. Response amplitudes and SNRs were similar for all stimuli at contrast 0.4 but grew faster with increasing contrast for the sparser stimuli. The best sparse stimulus provided an SNR improvement that corresponded to a recording time improvement of 2.6 times relative to that required for contrast reversing stimuli. Multiple regression of log-transformed response metrics characterized the contrast-response functions by fitting power-law relationships. The exponents for the two sparsest stimuli were significantly larger (P < 0.001) than for the CR stimuli, as were the mean response amplitudes and signal-to-noise ratios for these stimuli. The contrast-dependent response enhancement is discussed with respect to the possible influences of rapid retinal contrast gain control, or intracortical and cortico-geniculate feedback.

Relationship of Visual-Evoked Potentials With Specific Symptoms of Schizotypy

2012 ◽  
Author(s):  
Jeffrey S. Bedwell ◽  
Yuri Rassovsky ◽  
Pamela Butler ◽  
Andrea Ranieri ◽  
Christopher Spencer ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Relationship Of ◽  
Specific Symptoms ◽  
Visual Evoked
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