Unit discharges in the mediodorsal nucleus of the rabbit evoked by electrical stimulation of the olfactory bulb
1974; Elsevier BV; Volume: 75; Issue: 2 Linguagem: Inglês
10.1016/0006-8993(74)90741-0
ISSN1872-6240
AutoresJan C. Jackson, Robert M. Benjamin,
Tópico(s)Neural dynamics and brain function
ResumoThe mediodorsal nucleus of the thalamus (MD) in rabbits was explored with microelectrodes during electrical stimulation of the olfactory bulb and tract. In agreement with previous results in the squirrel monkey, unit responses were located within the medial half of MD. Response patterns included early discharges with latencies of 50 msec or less, late discharges with latencies of more than 100 msec, or dual early and late responses. The interval between early and late responses was characteristically a silent period even in units with spontaneous activity. Units which responded at an early latency were more commonly seen than those which showed only a late response. Latencies to first spike within the former group ranged from 15 to 50 msec (median = 36 msec) when the rostral olfactory bulb was stimulated and from 8 to 36 msec (median = 20m sec) when the stimulating electrode was in the rostral retrobulbar area adjacent to the lateral olfactory tract. Major features of response showed some parallels with results obtained both in the squirrel monkey MD and in the cat prepyriform cortex, a structure reported to have direct anatomical connections with the medial portion of MD.
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