Visual Neuroscience

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Somatostatin inhibits calcium influx into rat rod bipolar cell axonal terminals
Visual Neuroscience - Tập 18 Số 1 - Trang 101-108 - 2001
Juliette Johnson, MICHAEL L. CARAVELLI, Nicholas C. Brecha
In the retina, somatostatin (SST), an inhibitory peptide that influences neuronal activity, is predominantly expressed by sparsely occurring amacrine cells. The SST subtype 2A receptor is expressed by rod bipolar cells, including their axonal terminals. We used Ca2+-imaging techniques and the ratiometric Ca2+ indicator dye fura-2 AM to invest...... hiện toàn bộ
Activity correlates of cytochrome oxidase-defined compartments in granular and supragranular layers of primary visual cortex of the macaque monkey
Visual Neuroscience - Tập 12 Số 4 - Trang 629-639 - 1995
Edgar A. DeYoe, Thomas C. Trusk, Margaret T.T. Wong‐Riley
AbstractTo determine if changes in metabolic capacity revealed by cytochrome oxidase (CO) histochemistry are related to sustained changes in energy-utilizing neuronal activity, we assayed CO levels and recorded multiunit firing rates along nearly tangential penetrations of V1 in seven adult macaque monkeys before and after single, monocular injections of TTX. Withi...... hiện toàn bộ
A retinal dark-light switch: A review of the evidence
Visual Neuroscience - Tập 13 Số 3 - Trang 399-409 - 1996
Ian G. Morgan, M K Boelen
AbstractWe propose that there exists within the avian, and perhaps more generally in the vertebrate retina, a two-state nonadapting flip-flop circuit, based on reciprocal inhibitory interactions between the photoreceptors, releasing melatonin, the dopaminergic amacrine cells, and amacrine cells which contain enkephalin-, neurotensin-, and somatostatin-like immunore...... hiện toàn bộ
Normalization of cell responses in cat striate cortex
Visual Neuroscience - Tập 9 Số 2 - Trang 181-197 - 1992
David J. Heeger
AbstractSimple cells in the striate cortex have been depicted as half-wave-rectified linear operators. Complex cells have been depicted as energy mechanisms, constructed from the squared sum of the outputs of quadrature pairs of linear operators. However, the linear/energy model falls short of a complete explanation of striate cell responses. In this paper, a modif...... hiện toàn bộ
Adaptation in single units in visual cortex: The tuning of aftereffects in the temporal domain
Visual Neuroscience - Tập 2 Số 6 - Trang 609-620 - 1989
Alan Saul, M. Cynader
AbstractAdaptation-induced changes in the temporal-frequency tuning and direction selectivity of cat visual cortical cells were studied. Aftereffects were induced largely independent of direction. Adapting in either direction reduced responses in both directions. Aftereffects in the direction opposite that adapted were only slightly weaker than were aftereffects in...... hiện toàn bộ
Adaptation in single units in visual cortex: The tuning of aftereffects in the spatial domain
Visual Neuroscience - Tập 2 Số 6 - Trang 593-607 - 1989
Alan Saul, M. Cynader
AbstractCat striate cortical neurons were investigated using a new method of studying adaptation aftereffects. Stimuli were sinusoidal gratings of variable contrast, spatial frequency, and drift direction and rate. A series of alternating adapting and test trials was presented while recording from single units. Control trials were completely integrated with the ada...... hiện toàn bộ
Steady discharges of X and Y retinal ganglion cells of cat under photopic illuminance
Visual Neuroscience - Tập 9 Số 6 - Trang 535-553 - 1992
John B. Troy, J. G. Robson
AbstractThe discharges of ON- and OFF-center X and Y retinal ganglion cells in the presence of stationary patterns or of a uniform field of photopic luminance were recorded from urethane-anesthetized adult cats. The interval statistics and power spectra of these discharges were determined from these discharge records. The patterned stimuli were selected and positio...... hiện toàn bộ
Steady discharges of macaque retinal ganglion cells
Visual Neuroscience - Tập 11 Số 1 - Trang 111-118 - 1994
John B. Troy, B. B. Lee
AbstractSteady discharges were collected from ganglion cells of the magnocellular (MC) and parvocellular (PC) pathways of the macaque while their receptive fields were uniformly illuminated with a 4.7-deg steady yellow light of photopic illuminance. The mean rates, coefficients of variation, interval distributions, serial correlation coefficients, and power spectra...... hiện toàn bộ
Cortical potentials reflecting motion processing in humans
Visual Neuroscience - Tập 11 Số 6 - Trang 1135-1147 - 1994
Dieter R. Patzwahl, Johannes M. Zanker, Eckart Altenmüller
AbstractMotion processing is a fundamental task of visual systems, and in the monkey cortical areas can be identified which appear to be functionally specialized for motion processing. The human visual system is expected to be organized in a similar way. A noninvasive method to study the functional organization of the visual cortex is the recording of scalp potenti...... hiện toàn bộ
Synaptic organization of dopaminergic interplexiform cells in the goldfish retina
Visual Neuroscience - Tập 1 Số 1 - Trang 13-29 - 1988
Stephen Yazulla, Charles L. Zucker
AbstractThe synaptic organization of dopaminergic interplexiform cells (DA-IPC) in the goldfish retina was studied by a combined double-label electron-microscopical (EM) immunocytochemical/autoradiographical study. DA-IPCs were labeled with antisera against tyrosine hydroxylase. The possibility of synaptic contact with GABAergic amacrine cells in the proximal inner...... hiện toàn bộ
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