Visual adaptation: Neural, psychological and computational aspects

Visual adaptation: Neural, psychological and computational aspects

The term 'visual adaptation' describes the processes by which the visual system alters its operating properties in response to changes in the environment. These continual adjustments in sensory processing are diagnostic as to the computational principles underlying the neural coding of information and can have profound consequences for our perceptual experience. New physiological and psychophys...

Parts of visual form: computational aspects

Underlying recognition is an organization of ob jects and their parts into classes and hierarchies A rep resentation of parts for recognition requires that they be invariant to rigid transformations robust in the presence of occlusions stable with changes in viewing geometry and be arranged in a hierarchy These constraints are captured in a general framework using notions of a part line and a p...

Computational and Neural Mechanisms for Visual Suppression

I investigate the computational and the neural mechanisms for suppressing retinal vascular image (RVI) and attempt to generalize some conclusions to other visual suppression phenomena. First I present a new observation demonstrating RVI in negative afterimages. Then I discuss RVI suppression from a computational perspective and suggest: (1) RVI is always there in the retinal stimulation; (2) RV...

Computational Aspects of Feedback in Neural Circuits

It has previously been shown that generic cortical microcircuit models can perform complex real-time computations on continuous input streams, provided that these computations can be carried out with a rapidly fading memory. We investigate the computational capability of such circuits in the more realistic case where not only readout neurons, but in addition a few neurons within the circuit, ha...

Psychological Function in Computational Models of Neural Networks