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Search Results to John H.R. Maunsell

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One or more keywords matched the following properties of Maunsell, John H.R.

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overview Our research is aimed at understanding how neuronal signals in visual cerebral cortex generate perceptions and guide behavior. Our approach is to record from individual neurons in trained, behaving monkeys and mice while they perform visual tasks. Much of our work is directed at understanding how paying attention to specific visual targets affects the way that they are represented in the brain, and how changes in the sensory representation caused by attention relate to changes in perception and behavior. We have shown that attention increases the strength of neuronal responses without changing their selectivity, effectively representing the attended stimulus as if it were more intense than it really is. Paired measurements of neuronal responses and behavioral performance have shown that much of the behavioral advantage conferred by attention may be explained by this change it causes in the sensory representation, rather than decision processes. Another line of research has been exploring the more general question of how the activity of given neurons contributes to specific visual behaviors. Measurements of the trial-to-trial correlation between the strength of a neuron's responses to a weak stimulus and the animal's performance detecting that stimulus have shown that different neurons contribute to a greater or lesser degree to particular behaviors depending on which stimuli they are most sensitive to. We also use electrical and optical microstimulation to explore how different regions in visual cortex contribute to visual perceptions. By measuring the stimulus strength needed to produce a just-detectable stimulus in different cortical areas, we have found that all regions of cerebral cortex are comparable in their ability to produce detectable percepts.

One or more keywords matched the following items that are connected to Maunsell, John H.R.

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Concept Electrophysiology
Academic Article Effects of attention on the reliability of individual neurons in monkey visual cortex.
Academic Article Magnocellular and parvocellular contributions to the responses of neurons in macaque striate cortex.
Academic Article Attentional modulation of MT neurons with single or multiple stimuli in their receptive fields.
Academic Article Effects of task difficulty and target likelihood in area V4 of macaque monkeys.
Academic Article Attentional modulation of behavioral performance and neuronal responses in middle temporal and ventral intraparietal areas of macaque monkey.
Academic Article Neuronal representations of cognitive state: reward or attention?
Academic Article The effect of perceptual learning on neuronal responses in monkey visual area V4.
Academic Article Deficits in speed discrimination following lesions of the lateral suprasylvian cortex in the cat.
Academic Article A neuronal population measure of attention predicts behavioral performance on individual trials.
Academic Article Electrical microstimulation thresholds for behavioral detection and saccades in monkey frontal eye fields.
Academic Article Behavioral detection of electrical microstimulation in different cortical visual areas.
Academic Article Anterior inferotemporal neurons of monkeys engaged in object recognition can be highly sensitive to object retinal position.
Academic Article Physiological correlates of perceptual learning in monkey V1 and V2.
Academic Article Extraretinal representations in area V4 in the macaque monkey.
Academic Article Attention can be subdivided into neurobiological components corresponding to distinct behavioral effects.
Academic Article The Correlation of Neuronal Signals with Behavior at Different Levels of Visual Cortex and Their Relative Reliability for Behavioral Decisions.

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  • Behavioral
  • Electrophysiology