D J Braitman

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SUMMARY AND CONCLUSIONS 1. The discharge characteristics of 1,239 single units recorded in the flocculus of alert monkeys were studied in relation to visual, vestibular, and oculomotor events in a variety of paradigms. Animals were trained to fixate small target lights and were required to perform various tracking tasks designed to facilitate the(More)
Monkeys can change the amplitude of the spinal stretch reflex without change in initial alpha motor neuron tone, as measured by EMG, or in initial muscle length. Change is apparent in 5-10 days, continues to develop over weeks, and persists during inactive periods. Spinal stretch reflex change may be a valuable system for studying the neuronal and synaptic(More)
Description of the neuronal and synaptic bases of memory in the vertebrate central nervous system (CNS) requires a CNS stimulus-response pathway that is defined and accessible, has the capacity for adaptive change, and clearly contains the responsible substrates. This study was an attempt to determine whether the spinal stretch reflex (SSR), the initial,(More)
Transverse slices from guinea pig hippocampi were exposed to micromolar concentrations of sodium cyanide while neural and synaptic function were monitored in the CA1 region. Cyanide concentrations between 10 and 200 microM rapidly depressed synaptic transmission between Schaffer collateral-commissural fibers and CA1 pyramidal cells. Analysis of input/output(More)
Since the neurotoxicity of kainic acid may be due to the opening of membrane channels for calcium ions for (Ca2+), the effects of Ca2+ and other cations were examined on the specific binding of [3H]kainic acid to membranes from the forebrain of the rat. [3H]Kainic acid bound to a high affinity site (KD = 5.6 nM) that was inhibited in a(More)
SUMMARY AND CONCLUSIONS I. Single-unit recordings were obtained from 551 fibers in the vestibular portion of the eighth nerve in awake rhesus monkeys. Slightly more than half of these recordings were from normal animals and the remainder from animals adapted to dove prism (left-right) reversing spectacles for 2 or more weeks. 2. Horizontal vestibuloocular(More)
1. In an effort to identify the neurotransmitter released from terminals of the lateral olfactory tract (LOT) we have studied excitatory amino acid agonist and antagonist actions on population and single-unit responses in submerged and perfused slices of rat prepyriform cortex. Previous studies suggest that the transmitter at this synapse is either(More)
Olfactory cortex brain slices were subject to multiple bath applications of either glutamate or aspartate. The effectiveness of these amino acids (measured by quantitating the amplitude of lateral olfactory tract-stimulated field potentials) was progressively reduced with each successive perfusion of the agonist. However, the effectiveness of the endogenous(More)
The involvement of the NMDA receptor in the neurotoxicity induced by soman, an organophosphorus compound which irreversibly inhibits cholinesterase, was studied in guinea pigs. The drug MK-801 (0.5, 1 or 5 mg/kg, i.p.) was given as a pretreatment before a convulsant dose of soman or as a posttreatment (30, 100 or 300 micrograms/kg, i.m.) 5 min after the(More)