摘要:

AbstractThe effect of membrane potential displacements caused by external current injection on the amplitudes of two antidromically evoked afterhyperpolarizations (AHP1and AHP2) was measured in extraocular motoneurons. AHP1had a reversal potential of –70m V and an average compensation for displacements from the reversal potential (“compensation gain”) of –0.36. AHP2had a reversal potential of –80mV and a compensation gain of –0.08. Measurements of input resistance of these motoneurons demonstrate a 30–50% decrease at depolarized membrane potentials. This rectification could account for the apparent lack of summation of AHP2. The functional role of AHP1and AHP2in the regulation of discharge frequencies of extraocular motoneurons during normal eye movements

ISSN:0360-4012    

DOI:10.1002/jnr.490020512

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1976

数据来源: WILEY

摘要:

AbstractThe aim of the study was to follow the amount and incorporation of14C‐valine into separate, soluble protein fractions of the hippocampus, thalamus, and visual cortex of rats from 0 to 72 hr after training. The behavioral test consisted of reversal of handedness with training twice daily for 25 min for 2 days, followed by a 5‐day intermission without training, and a final session of 25 min. The animals were injected intraperitoneally with14C‐valine 30 min before sacrifice and taken 0, 24, 48, and 72 hr after last training.After 24 hr, and only at that time, double incorporation values and increased amounts were observed in a protein fraction, No. 6 from the front, in all three brain areas of the trained rats compared to active controls. At 48 hr this protein fraction was at control

ISSN:0360-4012    

DOI:10.1002/jnr.490020513

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1976

数据来源: WILEY

摘要:

AbstractMultiple unit activity (MUA) was obtained from gonadotropic areas of the hypothalamus in quail. Pellets of radioluminous paint (RLP) were implanted unilaterally either in the nucleus tuberis or in the n. posterior medialis hypothalami. Control data were obtained from birds receiving nonluminous material (RP). Spontaneous MUA was decreased by 25% in gonadotropic areas in RLP‐treated quail. Direct permanent photostimulation of hypothalamic neuronal population was not as effective in decreasing MUA as environmental photostimulation (50%). Activation in firing rats, which was constant in nonphotostimulated intact birds in response to repetitive flash‐light stimulations, was completely suppressed after implantation of

ISSN:0360-4012    

DOI:10.1002/jnr.490020514

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1976

数据来源: WILEY

ISSN:0360-4012    

DOI:10.1002/jnr.490020501

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1976

数据来源: WILEY