Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-1106
    Keywords: Visual evoked potentials ; Scalp field distributions ; Upper vs lower hemiretina
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Scalp potential fields in human subjects were evoked by checkerboard reversals to the upper and lower hermiretinae, using 1.6 and 3.2 reversals/s. Averaged fields were sampled along a saggital midline row of electrodes (field profiles) in 20 subjects, and from a 47 electrode array (field maps) in five subjects. In five subjects, profile peaks and troughs between 84 and 128 ms latency resided within the recorded electrode row surrounded by lesser potential values, and thus met the evaluation criteria. Response latency defined as maximal voltage difference between two electrodes within the profiles was significantly shorter (medians 12 and 11 ms, respectively) for upper than for lower hemiretina stimuli at both frequencies. There was a significant difference between latencies to 3.2 and 1.6 stimuli/s in the upper but not in the lower hemiretina system, suggesting different system behavior of the two retinal halves. Pertinent anatomical, electrophysiological, and behavioral data are reviewed.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-1106
    Keywords: Visual evoked potentials ; Scalp field EP distribution ; Monocular vs binocular stimuli ; Upper vs lower hemiretina
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Scalp potentials evoked by monocular and binocular 2/s checkerboard reversals with checks of 56 or 14 min were recorded from four midline electrodes between inion and 7.5 cm above inion vs a common anterior reference in 31 normals. The electrode location and latency of the evoked maximal occipitally positive potential difference between any 2 of the 5 electrodes, between 80 and 140 ms latency was determined in each run. Mean maximum locations over subjects for upper hemiretinal, binocular stimuli were more anterior than for monocular stimuli; for lower hemiretinal stimuli, inverted location differences were found. Binocular responses also had shorter latencies than monocular responses. Since area 18 is more anterior to 17 for upper, more posterior to 17 for lower hemiretinal projection to cortex, the results suggest that neurons which respond only if both eyes are simultaneously stimulated are more frequent in higher than lower order visual areas.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...