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Parallel and Serial Neural Mechanisms for Visual Search in Macaque Area V4
Serial and parallel mechanisms of response enhancement and neural synchrony work together to identify objects in a scene by recordings of neurons freely scanning a complex array to find a target defined by color, shape, or both.
Carbon nanotube coating improves neuronal recordings.
- E. Keefer, B. Botterman, M. Romero, A. Rossi, G. Gross
- Materials ScienceNature nanotechnology
- 1 July 2008
Carbon nanotube-coated electrodes are expected to improve current electrophysiological techniques and to facilitate the development of long-lasting brain-machine interface devices.
Contextual Modulation in Primary Visual Cortex of Macaques
V1 neurons appear to signal texture boundaries rather than figures per se, and are influenced by stimuli outside the classical RF, but they do not appear to segregate figures from ground.
Temporal limits of brightness induction and mechanisms of brightness perception
Neural Correlates of Perceived Brightness in the Retina, Lateral Geniculate Nucleus, and Striate Cortex
It is suggested that brightness information is explicitly represented in the responses of neurons in striate cortex as part of a neural representation of object surfaces.
Top–Down Attentional Deficits in Macaques with Lesions of Lateral Prefrontal Cortex
- A. Rossi, N. P. Bichot, R. Desimone, Leslie G. Ungerleider
- Psychology, BiologyThe Journal of Neuroscience
- 17 October 2007
The PFC appears to play a critical role in the ability to flexibly reallocate attention on the basis of changing task demands and is removed unilaterally in combination with transection of the corpus callosum and anterior commissure in two macaques.
Lesions of prefrontal cortex reduce attentional modulation of neuronal responses and synchrony in V4
- G. Gregoriou, A. Rossi, Leslie G. Ungerleider, R. Desimone
- Biology, PsychologyNature Neuroscience
- 1 June 2014
To identify critical sources of attentional feedback to area V4, the entire lateral PFC was removed, including the FEF, in one hemisphere and transected the corpus callosum and anterior commissure in two macaques.
The Representation of Brightness in Primary Visual Cortex
A significant percentage of neurons in primary visual cortex were shown to respond in a manner correlated with perceived brightness, rather than responding strictly to the light level in the receptive fields of the cells, suggesting that even at the first stage of visual cortical processing, spatial integration of information yields perceptual qualities that are only indirectly related to the pattern of illumination of the retina.
Depth in anticorrelated stereograms: Effects of spatial density and interocular delay