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Recording compound action potentials from the optic nerve in man and monkeys
A R Møller1, J E Burgess, L N Sekhar
1Department of Neurological Surgery, University of Pittsburgh School of Medicine, PA 15213.
Electroencephalography and Clinical Neurophysiology
|December 1, 1987
Summary
This study recorded optic nerve compound action potentials in humans and monkeys using light flashes. Findings reveal distinct electrical signal patterns and latencies in the optic nerve, crucial for understanding visual pathway function.
Area of Science:
- Neuroscience
- Ophthalmology
- Electrophysiology
Background:
- Optic nerve function is critical for visual processing.
- Understanding compound action potentials provides insights into neural signal transmission.
Purpose of the Study:
- To record and characterize compound action potentials from the optic nerve in humans and rhesus monkeys.
- To investigate the electrophysiological responses of the optic nerve to visual stimuli.
Main Methods:
- Compound action potentials were recorded from the optic nerve in human neurosurgery patients and rhesus monkeys.
- Stimuli involved short light flashes delivered via contact lens-mounted LEDs.
- Simultaneous recordings were made using scalp electrodes.
Main Results:
- Human optic nerve recordings showed an initial positive deflection (latency ~45 msec) followed by negativity (latency 60-70 msec).
- Scalp recordings in humans (Oz-forehead) revealed positive deflections around 80 msec latency.
- Rhesus monkey optic nerve recordings near the globe showed negative deflections (latency ~17 msec), with chiasm recordings exhibiting initial positive deflections (~35 msec latency).
Conclusions:
- Optic nerve compound action potentials exhibit distinct waveforms and latencies in humans and monkeys.
- Recording techniques provide valuable data on visual pathway electrophysiology.
- Individual variations in potential shape and size were observed, highlighting inter-subject differences.