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Neuroscience Homepage  > Faculty List > Ghose

Geoffrey M. Ghose, Ph.D.

Associate Professor, Department of Neuroscience; link to lab web page

Strategies in Visual Cortex.

The cerebral cortex embodies an interesting dichotomy in the representation of information: on the one hand it must maintain a consistent and reliable representation of important information, and on the other hand it must be able to modify representations to adapt and learn. My broad research interest is how the cortex addresses these two potentially conflicting requirements. In particular I am interested in how strategies based on past experiences are used in the processing and execution of visually guided behavior.

Understanding how and why representations change in visual cortex will provide a powerful basis for studying a number of general issues concerning cortical information processing, including the interactions between behavior and sensation, the mechanisms underlying learning and development, and the neural coding of information.

Figure 1(above). Orientation change detection task. a, Stimuli of a typical trial. Animals fixated on a central spot throughout the trial (cross). Stimuli were located at four different locations: two adjacent locations within the receptive field (oval, positions 1 and 2) and opposite the receptive field (positions 3 and 4). If the animal was cued to attend to position 2 (an 'attend in' location), it would have to release a lever when a change happened at this location (middle and right panels), while ignoring the change at position 4 (left and middle panels). Attentional modulation was measured by comparing responses for visually identical trials in which the animal attended to different locations. b, Orientation changes occurred at random times after stimulus onset according to the indicated probability distribution. c, The behaviourally relevant probability is the probability that a change will occur at a given point in time given that one has not occurred already (hazard function). The hazard function is zero for the first 500 ms (no changes occurred) and then rises to a maximum 2.25 s after stimulus presentation.

Selected Publications
Ghose G.M. and Bearl D.W. (2010)
Attention directed by expectations enhances receptive fields in cortical area MT.
Vision Res. 50(4): 441-51
Ghose G.M. (2009)
Attentional modulation of visual responses by flexible input gain.
J Neurophysiol. 101(4): 2089-106
Ghose G.M. and Harrison I.T. (2009)
Temporal precision of neuronal information in a rapid perceptual judgment.
J. Neurophysiol. 101(3): 1480-93
Ghose G.M. and Maunsell J.H. (2008)
Spatial summation can explain the attentional modulation of neuronal responses to multiple stimuli in area V4.
J. Neurosci. 28(19): 5115-26
Yoshor D., Ghose G.M., Bosking W.H., Sun P. and Maunsell J.H. (2007)
Spatial attention does not strongly modulate neuronal responses in early human visual cortex.
J. Neurosci. 27(48): 13205-9
Yoshor D., Bosking W.H., Ghose G.M. and Maunsell J.H. (2007)
Receptive fields in human visual cortex mapped with surface electrodes.
Cereb. Cortex 17(10): 2293-302
Ghose G.M. (2006)
Strategies optimize the detection of motion transients.
J. Vis. 6(4): 429-40
Ghose G.M. (2004)
Learning in mammalian sensory cortex.
Curr. Opin. Neurobiol. 14(4): 513-18
Ghose G.M. and Maunsell J.H. (2002)
Attentional modulation in visual cortex depends on task timing.
Nature 419(6907): 616-20
Ghose G.M., Yang T. and Maunsell J.H. (2002)
Physiological correlates of perceptual learning in monkey V1 and V2.
J. Neurophysiol. 87(4): 1867-88
Ghose G.M. and Maunsell J. (1999)
Specialized representations in visual cortex: a role for binding?
Neuron 24(1): 79-85, 111-25
DeAngelis G.C., Ghose G.M., Ohzawa I. and Freeman R.D. (1999)
Functional micro-organization of primary visual cortex: receptive field analysis of nearby neurons.
J. Neurosci. 19(10): 4046-64
Maunsell J.H., Ghose G.M., Assad J.A., McAdams C.J., Boudreau C.E. and Noerager B.D. (1999)
Visual response latencies of magnocellular and parvocellular LGN neurons in macaque monkeys.
Vis. Neurosci. 16(1): 1-14
Ghose G.M. and Ts'o D.Y. (1997)
Form processing modules in primate area V4.
J. Neurophysiol. 77(4): 2191-96
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