Abstracts » Zoology and wildlife conservation

Small modulation of ongoing cortical dynamics by sensory input during natural vision

Article Abstract:

The relationship between spontaneous activity and the response of primary visual cortical neurons to dynamic natural-scene and random-noise film images in awake is examined, freely viewing ferrets from the time of eye opening to maturity. It is found that in both the developing and mature visual stimulation, irrespective of the sensory evoked neural activity represents the modulation and triggering of ongoing circuit dynamics by input signals, rather than directly reflecting the structure of the input signal itself.

Neurons

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Adaptive filtering enhances information transmission in visual cortex

Article Abstract:

An information-theoretic method that allows unbiased calculation of neutral filters (receptive fields) from responses to natural scenes or other complex signals with strong multipoint correlations is applied to assess whether the brain's coding strategy depends on the stimulus ensemble. It is found in the primary visual cortex that neural filters adaptively change with the input ensemble so as to increase the information carried by the neural response about the filtered stimulus.

Sensory stimulation

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Elements of visual perception

Article Abstract:

The brain's anterior inferotemporal cortex (IT) may provide the physiological basis for visual memory by arranging iconic figures into columns. A small number of these iconic figures are thought to be what the brain uses to record memories of perceived objects. Ichiro Fujita and co-workers tested the visual responses of monkeys and confirmed the hypothesis that the IT governs the processing of memory.

Physiological aspects, Neurobiology, Memory, Visual perception

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