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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.

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.

Item TypeName
Concept Signal Processing, Computer-Assisted
Concept Signal Detection, Psychological
Academic Article Cortical neural populations can guide behavior by integrating inputs linearly, independent of synchrony.
Academic Article Attentional modulation of MT neurons with single or multiple stimuli in their receptive fields.
Academic Article Motion processing in macaque V4.
Academic Article Attentional modulation of visual motion processing in cortical areas MT and MST.
Academic Article Mixed parvocellular and magnocellular geniculate signals in visual area V4.
Academic Article Visual processing in monkey extrastriate cortex.
Academic Article A strong constraint to the joint processing of pairs of cortical signals.
Academic Article Microstimulation reveals limits in detecting different signals from a local cortical region.
Academic Article Computer-controlled electrical stimulation for quantitative mapping of human cortical function.
Academic Article The role of attention in visual processing.
Academic Article Tuned normalization explains the size of attention modulations.
Academic Article Using neuronal latency to determine sensory-motor processing pathways in reaction time tasks.
Academic Article Effects of attention on the processing of motion in macaque middle temporal and medial superior temporal visual cortical areas.
Academic Article Graded Neuronal Modulations Related to Visual Spatial Attention.
Academic Article Spatially tuned normalization explains attention modulation variance within neurons.
Academic Article Neuronal Effects of Spatial and Feature Attention Differ Due to Normalization.
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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  • Processing