What we see is how we are: New paradigms in visual researchReportar como inadecuado

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As most sensory modalities, the visual system needs to deal with very fast changes in the environment.Instead of processing all sensory stimuli, the brain is able to construct a perceptual experience by combiningselected sensory input with an ongoing internal activity. Thus, the study of visual perception needs to beapproached by examining not only the physical properties of stimuli, but also the brain’s ongoing dynamicalstates onto which these perturbations are imposed. At least three different models account for this internaldynamics. One model is based on cardinal cells where the activity of few cells by itself constitutes theneuronal correlate of perception, while a second model is based on a population coding that states that theneuronal correlate of perception requires distributed activity throughout many areas of the brain. A thirdproposition, known as the temporal correlation hypothesis states that the distributed neuronal populationsthat correlate with perception, are also defined by synchronization of the activity on a millisecond timescale. This would serve to encode contextual information by defining relations between the features of visualobjects. If temporal properties of neural activity are important to establish the neural mechanisms ofperception, then the study of appropriate dynamical stimuli should be instrumental to determine how thesesystems operate. The use of natural stimuli and natural behaviors such as free viewing, which features fastchanges of internal brain states as seen by motor markers, is proposed as a new experimental paradigm tostudy visual perception.

Autor: Maldonado Arbogast, Pedro; -

Fuente: http://repositorio.uchile.cl/


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