Gender Differences in Pattern Reversal Evoked Potentials in Normal Elderly

Fein, George; Brown, Fiona F.

doi:10.1111/j.1469-8986.1987.tb00350.x

Cited by 20 publications

(11 citation statements)

References 18 publications

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“…The N150 latency differences were significant even when P 100 latency effect were partially out statistically. The result provide evidences that in the elderly gender differences in PREP amplitude reflects factor specific to CNS processing of visual stimuli rater than global CNS anatomical or physiological factors and that gender differences in P 100 latency reported in younger group were also present in the elderly [17].…”

Section: Vep In Elderly Populationsupporting

confidence: 52%

Visual evoked Potential (VEP): Comparative study of physiological variation in children below 5 years and adults beyond 50 Years

Wadhera¹,

Dudhmal²

2015

Int J Med Res Rev

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Introduction: Visual evoked Potential is the electrical potential difference recorded from the surface of scalp in response to Visual stimuli. It represents a resultant response of cortical as well as subcortical areas to photostimulation. Although various studies have been done on visual evoked potential but there are few studies from India only. Therefore this study was planned to compare visual evoked potentials by recording battery of N 70 , P 100 & N 155 waveform in children and adults beyond 50 years. Methods: Present study was conducted in department of Physiology of Tertiary care teaching hospital. 50 healthy patients were included in two groups, below 5 years and beyond 50 years. Visual evoked Potential has been recorded and their physiological Variation has been observed. Results: In our study on comparison between children and adults beyond 50 years there were no differences in amplitude and latency of N 70 and N155 waves observed. P100 latencies have shown statistically significant differences in amplitude and latencies although no differences in duration war observed. Conclusion: It is important that physiological variation should be kept in mind whenever we are making any interpretations. The changes in P100 with age may reflect senile changes in eye and optic nerve especially beyond 60 years of age.

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Section: Vep In Elderly Populationsupporting

confidence: 52%

Visual evoked Potential (VEP): Comparative study of physiological variation in children below 5 years and adults beyond 50 Years

Wadhera¹,

Dudhmal²

2015

Int J Med Res Rev

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“…Gender has been shown to influence a variety of electrophysiological measures. It has been widely reported that adult women have larger brainstem and cortical evoked responses (e.g., Beaumont and Mayes, 1977;Buchsbaum et al 1974;Fein and Brown 1987;Halliday 1982;Michalewski et al 1980;Shagass et al 1972;Shearer et al 1992) and shorter EP latencies than men (e.g., Allison et al 1983;Fein and Brown 1987;Ikuta and Furuta 1982;Shagass et al 1972;Stockard et al 1979;Taylor et al 1990;Trune et al 1988). However, the factors that mediate electrophysiological differences between men and women are not well understood.…”

Section: Discussionmentioning

confidence: 99%

Gender differences in gating of the auditory evoked potential in normal subjects

Hetrick

Sandman

Bunney

et al. 1996

Biological Psychiatry

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Central nervous system (CNS) inhibitory mechanisms hypothesized to "gate" repetitive sensory inputs have been implicated in the pathology of schizophrenia. The present study investigated gender differences in inhibitory gating of evoked brain responses to repeated stimuli in normal subjects (30 women and 30 men) using an auditory conditioning-testing paradigm. Pairs of click stimuli (S1 and S2) were presented with a 0.5 s intrapair and a 10 s interpair interval. The amplitudes and latencies of the P50, N100, P180 components of the auditory evoked response to the conditioning (S1) and test response (S2) were measured, and the gating ratios were computed (T/C ratio = S2/S1 * 100). The amplitudes to S1 were not significantly different between men and women at P50, N100, or P180. However, women had significantly higher amplitudes to S2 at P50 (p = 0.03) and N100 (p = 0.04). The T/C ratios for women were higher (i.e., less suppression of response to S2) for P50 (p = 0.08) and N100 (p = 0.04) compared to men. The results suggested that differences in auditory gating between men and women were not due to biological differences in the P50 and N100 generators but possibly to differential influence of inhibitory mechanisms acting on the generator substrates of these evoked responses.

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“…Studies were performed in the neurophysiology labora tory (Fein and Brown, 1987) under a PS protocol identical to that used in the magnet. Midline electrodes were placed over the occipital lobe (Oz) referenced to the fron tal lobe (Fz).…”

Section: Evoked Potentialsmentioning

confidence: 99%

Effect of Photic Stimulation on Human Visual Cortex Lactate and Phosphates Using ¹H and ³¹P Magnetic Resonance Spectroscopy

Sappey–Marinier

Calabrese

Fein

et al. 1992

J Cereb Blood Flow Metab

386

260

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Previous animal and human studies showed that photic stimulation (PS) increased cerebral blood flow and glucose uptake much more than oxygen consumption, suggesting selective activation of anaerobic glycolysis. In the present studies, image-guided 1H and 31P magnetic resonance spectroscopy (MRS) was used to monitor the changes in lactate and high-energy phosphate concentrations produced by PS of visual cortex in six normal volunteers. PS initially produced a significant rise (to 250% of control, p less than 0.01) in visual cortex lactate during the first 6.4 min of PS, followed by a significant decline (p = 0.01) as PS continued. The PCr/Pi ratios decreased significantly from control values during the first 12.8 min of PS (p less than 0.05), and the pH was slightly increased. The positive P100 deflection of the visual evoked potential recorded between 100 and 172 ms after the strobe was significantly decreased from control at 12.8 min of PS (p less than 0.05). The finding that PS caused decreased PCr/Pi is consistent with the view that increased brain activity stimulated ATPase, causing a rise in ADP that shifted the creatine kinase reaction in the direction of ATP synthesis. The rise in lactate together with an increase in pH suggest that intracellular alkalosis, caused by the shift of creatine kinase, selectively stimulated glycolysis.

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Gender Differences in Pattern Reversal Evoked Potentials in Normal Elderly

Cited by 20 publications

References 18 publications

Visual evoked Potential (VEP): Comparative study of physiological variation in children below 5 years and adults beyond 50 Years

Visual evoked Potential (VEP): Comparative study of physiological variation in children below 5 years and adults beyond 50 Years

Gender differences in gating of the auditory evoked potential in normal subjects

Effect of Photic Stimulation on Human Visual Cortex Lactate and Phosphates Using ¹H and ³¹P Magnetic Resonance Spectroscopy

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Gender Differences in Pattern Reversal Evoked Potentials in Normal Elderly

Cited by 20 publications

References 18 publications

Visual evoked Potential (VEP): Comparative study of physiological variation in children below 5 years and adults beyond 50 Years

Visual evoked Potential (VEP): Comparative study of physiological variation in children below 5 years and adults beyond 50 Years

Gender differences in gating of the auditory evoked potential in normal subjects

Effect of Photic Stimulation on Human Visual Cortex Lactate and Phosphates Using 1H and 31P Magnetic Resonance Spectroscopy

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Product

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Effect of Photic Stimulation on Human Visual Cortex Lactate and Phosphates Using ¹H and ³¹P Magnetic Resonance Spectroscopy