Search Results - "Hamer, Russell D"

Surreal space in René Magritte's Le Blanc-Seing (1965) by Hamer, Russell D

“…"The function of painting is to make poetry visible… to render thought visible." René Magritte Pictorial art reveals some of the visual brain's "neural rules"…”
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Effects of age and optical blur on real depth stereoacuity by Costa, Marcelo F., Moreira, Sonia M. C. F., Hamer, Russell D., Ventura, Dora F.

“…Stereoscopic depth perception utilizes the disparity cues between the images that fall on the retinae of the two eyes. The purpose of this study was to…”
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The visual world of infants: discovering what babies can see has been a formidable challenge, but research methods now provide an objective picture of their surprising visual abilities by Hamer, Russell D

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Visual losses in early-onset and late-onset Parkinson's disease by Feitosa-Santana, Claudia, Fernandes Costa, Marcelo, Ballalai Ferraz, Henrique, Andrade, Luiz Augusto F, Moura, Ana Laura, Amaro, Edson, Hamer, Russell D, Fix Ventura, Dora

“…Patients with Parkinson's disease (PD) manifest visual losses. However, it is not known whether these losses are equivalent in both early-onset (EOPD) and…”
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The Visual World of Infants by Hamer, Russell D.

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Computational analysis of vertebrate phototransduction: combined quantitative and qualitative modeling of dark- and light-adapted responses in amphibian rods by Hamer, R D

“…We evaluated the generality of two models of vertebrate phototransduction. The approach was to quantitatively optimize each model to the full waveform of…”
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Transcranial direct current stimulation can selectively affect different processing channels in human visual cortex by Costa, Thiago L., Hamer, Russell D., Nagy, Balázs V., Barboni, Mirella T. S., Gualtieri, Mirella, Boggio, Paulo S., Ventura, Dora F.

“…Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique that can modulate cortical activity. Nonetheless, information…”
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Chromatic discrimination losses in multiple sclerosis patients with and without optic neuritis using the Cambridge Colour Test by Moura, Ana Laura de Araújo, Teixeira, Rosani Aparecida Antunes, Oiwa, Nestor N, Costa, Marcelo F, Feitosa-Santana, Claudia, Callegaro, Dagoberto, Hamer, Russell D, Ventura, Dora Fix

“…We assessed chromatic discrimination in multiple sclerosis (MS) patients both with (ON) and without (no ON) a history of optic neuritis using the Cambridge…”
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Effect of contrast and gaps between Vernier stimulus elements on sweep visual evoked potential measurements of human cortical Vernier responses by Hamer, Russell D., Carvalho, Fabio Alves, Ventura, Dora Fix

“…The present paper focuses on a classic hyperacuity, Vernier acuity-the ability to discriminate breaks in the collinearity of lines or edges on the order of…”
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The Jitter Spatial Frequency Sweep VEP: A new paradigm to study spatiotemporal development of pattern- and motion-processing mechanisms in human infants by Hamer, Russell D., Norcia, Anthony M.

“…We introduce a new VEP paradigm - the Jitter Spatial Frequency (JSF) Sweep VEP - that permits efficient mapping of the spatiotemporal tuning of the…”
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The Jitter Spatial Frequency Sweep VEP: a new paradigm to study spatiotemporal development of pattern- and motion-processing mechanisms in human infants by Hamer, Russell D., Norcia, Anthony M.

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Rayleigh discriminations in young human infants by Hamer, R D, Alexander, K R, Teller, D Y

“…The capacity of young infants to discriminate 3 x 3 degrees broadband red or 550 nm green squares from a 589 nm yellow surround was tested by means of the…”
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Analysis of Ca++-dependent gain changes in PDE activation in vertebrate rod phototransduction by Hamer, R D

“…Recent biochemical and physiological data point to the existence of one or more Ca++-mediated feedback mechanisms modulating gain at stages early in the…”
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On the reproducibility of single photon responses (SPRs): the gordian knot of rod phototransduction perseveres by Hamer, R. D., Nicholas, S. C., Tranchina, D., Liebman, P. A.

“…Abstract only…”
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Development of contrast sensitivity in the human infant by Norcia, A M, Tyler, C W, Hamer, R D

“…Contrast sensitivity and grating acuity were measured using the sweep VEP method in a group of 48 infants from 2 to 40 weeks of age and in a group of 10…”
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Plasticity of human motion processing mechanisms following surgery for infantile esotropia by Norcia, Anthony M., Hamer, Russell D., Jampolsky, Arthur, Orel-Bixler, Deborah

“…Monocular oscillatory-motion visual evoked potentials (VEPs) were measured in prospective and retrospective groups of infantile esotropia patients who had been…”
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The development of motion sensitivity during the first year of life by Hamer, R D, Norcia, A M

“…Using the sweep visual evoked potential (VEP), we have measured oscillatory displacement thresholds (OMTs) in 49 infants ranging in age from 7 to 54 weeks of…”
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Eccentricity and the Ferry-Porter law by Tyler, C W, Hamer, R D

“…Is the flicker limit governed by the Ferry-Porter law or by some other law? We previously obtained strong evidence for the wide applicability of the…”
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Measurement of spatial contrast sensitivity with the swept contrast VEP by Norcia, A M, Tyler, C W, Hamer, R D, Wesemann, W

“…Contrast response functions (CRFs) for the VEP were obtained with a Discrete Fourier Transform (DFT) technique employing swept contrast gratings. VEP CRFs in…”
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Phototransduction: modeling the primate cone flash response by Hamer, R D, Tyler, C W

“…We have developed a new model of phototransduction that accounts for the dynamics of primate and human cone flash responses in both their linear and saturating…”
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