In 30 healthy subjects the VECP following full-fields, upper, lower, nasal and temporal half-field stimulation was recorded. The full-field amplitudes is significantly larger than each of the half-field responses. For peak P120, the amplitudes following lower half-field stimulation is significantly larger than the amplitude due to upper, nasal and temporal half-field stimulation. The sum two half-field amplitude is significantly larger than the full-field response.
In 30 healthy subjects the visually evoked cortical potential following full-field and upper, lower, temporal and nasal half-field pattern-reversal stimulation was registered. No significantly differing latencies for peak N90 were to be seen. The responses of peak P120 for upper half-field stimulation showed a significantly longer latency than for full-field, lower, temporal and nasal half-field stimulation. Responses to upper and lower half-field stimulation showed no potential reversal. Nasal and temporal half-field stimulation evoked responses with no significantly differing P120 latencies.
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