Neuronal synchrony does not represent texture segregation

Article Abstract:

It has been suggested that the discrepancy between visualizing the world as a whole and the activation of neurons by limited portions of a visual field is bridged because neurons representing similar portions of the same object fire simultaneously so that the components of a scene are recognized. A new study tests the theory by observing neuronal activity in the primary visual cortex areas of monkeys presented with a variety of textured scenes. It is concluded that synchrony in the primary visual cortex is not reflected by the binding of features necessary for texture segregation.

Observations, Vision research, Neural transmission, Synaptic transmission

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Object-based attention in the primary visual cortex of the macaque monkey

Article Abstract:

The processes responsible for the segregation of objects in natural visual scenes from each other and the background are subdivided into a pre-attentive and attentive system. The attentive system is recruited when objects do not segregate automatically. It is investigated whether the attentive system is also linked to modulation of firing rates in area VI of the brain of trained monkeys performing a curve-tracing task. It is suggested that object-based attention is linked to a response enhancement.

Attention (Psychology), Attention

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Contour from motion processing occurs in primary visual cortex

Article Abstract:

The role of the primary visual cortex in image segmentation processing was demonstrated. Moving random dot patterns were presented to human and monkey subjects and potentials that resulted from this stimulus were recorded. Analysis of neuronal activity revealed response components for contour from motion processing. These signals were found in various layers of the monkey's primary visual cortex.

Brain, Localization (Brain function), Motion perception (Vision), Motion perception

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