Orientation-specific mechanisms in the human visual system

Orientation-specific adaptation in human visual cortex.

Nearly all methods for analyzing and interpreting functional magnetic resonance imaging (fMRI) data assume that the fMRI signal behaves in an approximately linear manner. However, it has been shown that the mean fMRI response to a pair of briefly presented visual stimuli is significantly smaller than would be expected from the response to a single stimulus. This smaller response could be the re...

Studying Feature Specific Mechanisms of the Human Visual System

Mechanisms involved in visual orientation constancy.

Visual orientation judgments made during body tilt (Eand A-effects), during centrifugation (oculogravic effect), and following prolonged tilt (aftereffect) are interpreted in terms of visual orientation constancy. Data from two classes of experiments, those using labyrinthine-defective subjects and those involving different combinations of posture, indicate that three systems are involved in or...

Mechanisms of Spatial Localization in the Human Visual System

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Neural mechanisms of orientation selectivity in the visual cortex.

The origin of orientation selectivity in the responses of simple cells in cat visual cortex serves as a model problem for understanding cortical circuitry and computation. The feed-forward model posits that this selectivity arises simply from the arrangement of thalamic inputs to a simple cell. Much evidence, including a number of recent intracellular studies, supports a primary role of the tha...