Spontaneous discharges of neurones in the thalamus, the mesencephalic and pontine reticular formation, the caudate nucleus and the hypothalamus were recorded in cats anesthetized with barbiturates.Only thalamic cells showed the spindle pattern of discharges, consisting of high frequency bursts separated by silent intervals, corresponding to a repetition frequency of 7–14/sec.All neurones outside the thalamus discharged randomly, with no correlation to the simultaneously occurring thalamic spindle activity.It is concluded that subcortical neutrones participating in spontaneous barbiturate spindle activity have an exclusive thalamic location.Consequently, the processes of synchronization and desynchronization both most likely take place at a thalamic level.
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Junge et al. (1968) studied this question.
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