Abstract
Semi-microelectrode recordings of electrical activity from anterior hypothalamus (AH), ventromedial hypothalamus (VMH), and mesencephalic reticular formation (MRF) were carried out to ascertain whether these electrodes can record the activity of single units. Classical criteria for defining single-unit activity were used, including polarity and stability of amplitude of the recorded discharge; a definable relationship between spike amplitude and electrode depth; and waveform characteristics. It was found that 117 units met these criteria, and in some of the recordings, characteristic burst discharges were observed, providing additional assurance that single-unit activity had been recorded. Thus, electrodes of 60 μm diameter are capable of recording the activity of single neural units in isolation from other neural tissue responses.
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