Abstracts » Zoology and wildlife conservation

Attention is everywhere

Article Abstract:

Visual attention in primates is modulated by two cortical pathways, which are organized hierarchically and in which attentional effects are seen early in the hierarchy. The dorsal pathway transmits messages to the parietal cortex, while the ventral pathway transmits information to the temporal lobe and is responsible for object recognition and visual working memory. Attentional control or selection mechanisms appear early in the cortical pathways and the visual system contains only one set of mechanisms which is responsible for selective attention.

Physiological aspects, Cerebral cortex, Attention (Psychology), Attention

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Collinear stimuli regulate visual responses depending on cell's contrast threshold

Article Abstract:

It is shown that neuronal facilitation occurs preferentially when a near-threshold stimulus within the receptive field is flanked by higher-contrasting collinear elements sited in the surrounding areas of visual space. Collinear and orthogonally oriented flanks work to reduce the response to high-contrast stimuli within the receptive field. Neuronal response modulation by stimuli outside of the receptive field, may be an early neural mechanism to encode objects and improve their perceptual saliency.

Research, Visual cortex

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Convergence of magno- and parvocellular pathways in layer 4B of macaque primary visual cortex

Article Abstract:

Inputs from magnocellular-stream-recipient layer 4C-alpha neurons and parvocellular-stream-recipient layer 4C-beta neurons converge at layer 4B neurons of the primary visual cortex. The parvocellular pathway of visual processing considerably affects the cortical regions receiving direct or indirect input from layer 4B. Laser-scanning photostimulation is used with intracellular recording and biocytin labeling to determine the sources of the local functional inputs to the layer 4B neurons.

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