At many synapses in the central nervous system, spikes within high-frequency trains have a better chance of driving the postsynaptic neuron than spikes occurring in isolation. We asked what mechanism accounts for this selectivity at the retinogeniculate synapse. The amplitude of synaptic potentials was remarkably constant, ruling out a major role for presynaptic mechanisms such as synaptic faci...

The alterations in local cerebral glucose utilisation in eight discrete nuclei in the thalamus following the administration of apomorphine (0.5 mg kg-1) have been investigated with the autoradiographic 2-deoxyglucose technique in 11 conscious rats. In two thalamic nuclei (parafascicular and ventrolateral nuclei), glucose utilisation was significantly elevated following apomorphine; in two thala...

In rats which were rendered monocular amblyopic by lid suturing one eye during a critical period, the intensity of neuronal activation in parts of the monocular segments of the striate cortex (layers 4 and 6) and lateral geniculate nucleus, and in the visual segment of the thalamic reticular nucleus, was determined after exploration of a novel-complex environment. Quantitative analysis of the n...

Optic atrophy is not a disease in itself but a clinical sign. It refers to pallor of the optic disc which results from irreversible damage to the retinal ganglion cells and axons. The axons of the retinal ganglion cells make up the optic nerve and continue onto the optic chiasm, optic tract and up to the lateral geniculate body before they synapse. Injury to the retinal ganglion cells and axons...

abstract extensive application of atrazine and its toxicity in environmental has attracted researcher attention for finding new degradation methods to this organic pollutant. biodegradation is one of most effective methods for removing atrazine. due to the importance of atrazine herbicide as an organic pollutant, a design carried out at factorial experiment in completely randomized design with ...

The lateral geniculate nucleus, which lies between the retina and the striate cortex in the visual pathway of mammals, is often made up of several distinctive cell layers, or laminae. We have used immunohistochemical methods to localize two glial cell intermediate filament proteins, glial fibrillary acidic protein and vimentin, and have found that layering of glial cells is evident before neuro...

Experiments with drifting gratings are widespread in the study of neurons in the retina and dorsal lateral geniculate nucleus (dLGN). As an alternative to descriptive modeling based on the di!erence-of-Gaussians model, we show how mechanistic models for the retinogeniculate circuitry can be tested against drifting-grating data. As an example of this approach we (i) derive mechanistic expression...

NAKAHAMA, H., ISHII, N., YAMAMOTO, M. and SAITO, H. Stochastic Dependency of Neural Impulse Sequences. Tohoku J. exp. Med., 1971, 103 (1), 117-118 The statistical dependent properties of the spontaneous impulse sequence recorded from the mesencephalic reticular formation (MRF) and the lateral geniculate nucleus (LGN) in cats were clarified with the following procedures. 1) the value of each int...

1 2 3 4 5 6 7 Learning-Related Neuronal Activity in the Ventral Lateral 8 Geniculate Nucleus during Associative Cerebellar Learning 9 10 11 Alireza Kashef, Matthew M. Campolattaro, and John H. Freeman 12 Department of Psychology, University of Iowa, Iowa City, IA 52242 13 Department of Psychology, Christopher Newport University, Newport News, VA 23606 14 15 16 Abbreviated Title: Lateral Genicul...