Showing papers in "Brain Research in 1974"

TL;DR: The hypothesis is given that the PNMT containing neurons represent A containing neurons, and that A may act as a neurotransmitter in the rat brain.

TL;DR: The concept of behavioural states in the young infant has been used in two connotations: (1) as a descriptive categorisation of behaviour; and (2) as an explanation of brain mechanisms which modify the responsiveness of the infant.

TL;DR: The extent and organization of motor (MsI) and somatosensory (SmI) cortex in the rat were investigated using intracortical stimulation with semi-microelectrodes and single- or multiple-unit recording techniques to find overlap was essentially complete for the hindlimb, but only partial for the forelimb.

TL;DR: It is proposed that focal electrical stimulation activates a pain suppressive system concentrated in periventricular and periaqueductal regions and its activation reduces responsiveness to noxious stimuli, at least in part, by blocking transmission of nociceptive information through the spinal cord.

TL;DR: It is concluded that the retinohypothalamic projection to the suprachiasmatic nuclei is essential for maintaining the entrainment to light of the circadian rhythm in pineal serotonin N-acetyltransferase activity in the rat.

TL;DR: It is concluded that the retrograde axonal transport of NGF, which was estimated to take place at a rate of about 2.5 mm/h, depends on a colchicine-sensitive mechanism as does the orthograde rapid axonal transports, however, the uptake of N GF may not only take place from the nerve terminals but also from the preterminal parts, as has been shown in other studies with horseradish peroxidase.

TL;DR: The evidence presented suggests first, that the degree of localization at the injection site is compatible with approaching some problems in neuroanatomy; second, that anterograde transport of the marker protein does not appear to confound the interpretation of retrogradely labeled cell bodies; third, that many, though not all, afferent cell populations can be identified.

TL;DR: The posterior hypothalamus (premammillary nuclei, caudal subdivision of the arcurate nucleus, posterior hypothalamic nucleus) contains norepinephrine and dopamine in relatively low concentrations, while the paraventricular and dorsomedial nuclei and the retrochiasmatic area are rich in norpinephrine.

TL;DR: If radioactive substances were transported transneuronally, injection of labeled material into one eye followed by autoradiography of the cortex might reveal the entire system of ocular-dominance columns.

TL;DR: The results thus indicate that the fibers of the GAD-containing axon terminals in substantia nigra of the cat originate in putamen and nucleus caudatus, and the activity of GAD was always lower in the medial part of pars compacta, which contains the highest concentration of cell bodies.

TL;DR: The representation of the cochlear partition within the 3 dimensions of the inferior colliculus of the cat was studied by determining the best frequency of neurons isolated in series of parallel electrode penetrations to suggest small sectors of the basilar membrane of approximately equal length were represented across individual anatomically defined cellular laminae within the nucleus.

TL;DR: Brain sites that support ICSS in the rat were found to be highly correlated with electrodes in 3 major CA systems: the mesolimbic and nigrostriatal dopaminergic systems and the dorsal noradrenergic system.

TL;DR: Serotonin was unevenly distributed throughout all the brain stem areas examined, and the motor nerve nuclei seemed to contain more of the amine than the sensory nerveuclei.

TL;DR: It is suggested that norepinephrine is a neurotransmitter candidate in the hippocampus and that it may act via the cyclic AMP system.

TL;DR: The mossy fiber terminal zone and the CA3–4 terminal zone in the dentate molecular layer of the ipsilateral hippocampus demonstrated HRP activity, presumably the result of orthograde axonal transport from the injection site.

TL;DR: The inferior olive is the major and probably the sole significant source of cerebellar climbing fibers and is concluded that a single olivary neuron can provide several Purkinje cells with climbing fibers.

TL;DR: Findings suggest that glutamic acid is the natural neurotransmitter of the cerebellar granule cell in hamsters induced by rat virus strain PRE 308.

TL;DR: It is hypothesized that a reduction in hippocampal 5-HT may account for the increased activity in the median lesioned group, following the placement of electrolytic lesions in the dorsal or median raphe nucleus of adult male rats.

TL;DR: Observations correlate well with a large body of evidence that certain synaptic connections in the cerebellum are inhibitory and that many, if not all, of the presynaptic components of these connections may use GABA as their neurotransmitter.

TL;DR: The data suggest that the flocculus exerts an inhibitory influence on mechanisms responsible for production of nystagmus with ipsilateral quick phases and contralateral slow phases and support the hypothesis that theFlocculus is a medium through which the visual system can alter or modify vestibular reflexes.

TL;DR: Sensitivity was observed in some of the ‘C-heat receptors’ by repeated exposition to noxious heat, and among myelinated fibers about half of the high threshold mechanoreceptors with group III afferents exhibited a response to heating above 45°C.

TL;DR: The initial postural response to galvanic stimulation was uneffected by the availability of cues from the feet and lower legs, although later components were strongly effected.

TL;DR: The electrical activity of single pyramidal cells in the hippocampus was monitored extracellularly during electrical stimulation of nucleus locus coeruleus (LC) in anesthetized rats to suggest that the inhibitory synapses of the fibers from LC to the hippocampus utilize NE as a transmitter.

TL;DR: The finding that the set and expectancy of the monkey could profoundly modify this ‘reflex’ response indicates that the transcortical serov-loop proposed by Phillips is subject to powerful modulation as a function of learning and volition.

TL;DR: Carohydrate substrates, organic phosphates, amino acids and ammonia were studied in the rat brain during complete ischemia of 1–15 min duration utilising an ischemic model with increase of the intracranial CSF pressure to suggest citric acid cycle intermediates in general were diverted towards amino acid formation.