Showing papers in "Experimental Neurology in 1970"

TL;DR: It is suggested that the cortex in the principal sulcus may be concerned with a form of spatial memory, whereas the arcuate cortex is concerned with some other, as yet unspecified function.

TL;DR: The extensor digitorum longus and soleus muscles of the rat were denervated and the acetylcholine (ACh) sensitivity and electrical constants of these muscles were measured at various times up to 45 days.

TL;DR: In these experiments one lateral half of the forebrain and diencephalon was largely removed at birth or maturity and the consequences to nervous system structure and motor-sensory and visual behavior were observed.

TL;DR: There is an increase in the concentration of potassium in the interstitial space during seizures, and a model is proposed in which this potassium accumulation is an important step in the regenerative, all-or-none-aspect of the initiation of seizures.

TL;DR: Electrolytic lesions were placed in various sites of the body of the caudate nucleus, and the distribution of the degenerating fibers was studied in sections stained by the Nauta silver impregnation technique or by the method of Fink and Heimer.

TL;DR: Synthesis phase of proliferating neurilemma cells in adult mouse sciatic nerve was studied during Wallerian degeneration to find the duration was found to be relatively constant and the duration of the synthesis phase was roughly comparable to that during peripheral nerve degeneration in the adult mouse.

TL;DR: In the spinal ventral horn of the mature cat and monkey, most motoneuron dendrites show high degrees of organization along the rostrocaudal axis and it is suggested that these dendrite bundles constitute subcenters for the integration of motor output.

TL;DR: The effect of electrode sampling bias to be significant was shown and it was shown that the probability of a successful isolation is largely a function of the cross-sectional area of the axon.

TL;DR: Laminar field potentials in the cerebral cortex elicited by repetitive stimulation of thalamic nuclei were studied and used to define so-called augmenting and recruiting responses, indicating the existence of two different thalamocortical projection systems responsible for the deep and superficial thalamOCortical responses.

TL;DR: A new quantitative method is described for investigating the effect of the physical and chemical environment on neuron survival in long-term culture and finds that after 11 days in culture approximately ten times as many neurons were present for 40.8 m m K+ medium as compared to the 6.8 K+medium.

TL;DR: It is demonstrated that malnutrition early in life will retard the rate of cell division and reduce the ultimate number of cells in human cerebrum, cerebellum and brain stem and that the rat as a model for studying the effects of malnutrition on cellular growth is questionable.

TL;DR: Results from cross-reinnervation techniques are interpreted as indicating that regulation of gene expression is one of the “trophic” functions of the vertebrate neuron.

TL;DR: The results demonstrate that serotonin is influenced by photoperiod fluctuations and suggest that the biogenic amine might be related to light-induced changes in neuroendocrine function.

TL;DR: The results strongly suggest that the cortex of the superior temporal gyrus is involved in the monkeys' use of temporally-patterned information.

TL;DR: The observation that a qualitatively different myosin appears in cross-reinnervated muscle indicates that a new species of protein has been synthesized, and it is suggested that the nerve influences gene expression in the muscle cell.

TL;DR: Single and summed visually evoked cortical responses of albino and hooded rats were compared before and after monocular occlusion or enucleation to determine if differences in optic tract terminations between strains of rats could be detected by variation in the electrical input recorded at the cortex.

TL;DR: Maintained and evoked unit activity in the mesencephalic reticular formation (MRF) was studied in behaving cats, and Gradation of unitary responsiveness in the three states was established as light sleep→arousal→deep sleep in order of increasing sensitivity.

TL;DR: It is important that the species, muscles, and enzymes studied be considered in interpreting results and that oversimplification of the three fiber types into a dual classification be avoided.

TL;DR: There is a close correlation in the decorticate rat between the appearance of complex behaviors, such as feeding, and of caudate inhibition of the excitatory mechanisms of the diencephalon.

TL;DR: The extracellular space of the cerebral cortex in the cat was estimated by methods of electrical impedance measurements and concentration profiles of radioactively labeled compounds following subarchnoid perfusion and was found to be between 15 and 20% and unchanged when the temperature of the cortex was decreased from 37 to 15C.

TL;DR: Electrical stimulation of the cat's inferior colliculus elicited contralaterally directed, conjugate deviations of the eyes and movement of the contralateral pinna in the encephale isole preparation, which support the hypothesis that output signals of the IC, which control orientation movements of eyes and pinnae to acoustic stimuli, are relayed through neurons of the superiorcolliculus.

TL;DR: Stimulation of tooth pulpal nerves in both anesthetized and alert cats elicited a vigorous jaw depression reflex and Disappearance of the jaw depression response following endodontic therapy indicated that the response was not caused by spread of current to extrapulpal nerve fibers.

TL;DR: The changing pattern of ChE staining in the cerebellar cortex was examined in rats 0, 3, 7, 10, 15, 21, and 30 days old and it is suggested that mossy fibers may establish direct contact with the Purkinje cells during this period.

TL;DR: These experiments demonstrate that much of the forepaw and facial regions of VB project to sulci within SI and SII, regions relatively inaccessible to investigation by other means, indicate an underlying columnar organization of the VB projection to SI, which provides a structural basis for the functional columnar organizations of neurons observed in SI.

TL;DR: With high level click stimuli it was found that efferent stimulation significantly increases the masked neural response of the cochlea, and input-output functions strongly suggest that there is a low threshold afferent fiber moiety whose response to low level signals is blocked by crossed efferent stimulating, but which are then available for excitation by higher level signals.

TL;DR: Evidence was obtained indicating that the audiogenic response in general is mediated through the inferior colliculus while audiogenic stimulus-bound emotional behavior may be mediated through extralemniscal pathways, and the ventral aspect of the inferiorColliculus may play an important role for precipitation of audiogenic convulsion.

TL;DR: Single neurons recorded in the upper lumbar spinal cord with microelectrodes were tested with afferent volleys from homosegmental white rami communicantes and spinal nerves and Ipsilateral and contralateral units were found that responded to both inputs.

TL;DR: Findings are presented that the ATPase of the high-activity (C) fibers is labile in acid (pH 4.35) and the ATP enzyme of the low- activity (B) fiber is labiles in alkali ( pH 10.4); these muscle fibers are phenotypically different with respect to their actomyosin ATPase.

TL;DR: Both central inhibition and facilitation can result from maximal stimulation of either A or C fibers without necessity of interaction between effects of these two groups.