Stereopsis provides a constant feed to visual shape representation.

The contribution of stereopsis in human visual shape perception was examined using stimuli with either null, normal, or reversed binocular disparity in an old/new object recognition task. The highest levels of recognition performance were observed with null and normal binocular disparity displays, which did not differ. However, reversed disparity led to significantly worse performance than either of the other display conditions.

A surface-based code contributes to visual shape perception.

Considerable uncertainty remains regarding the types of features human vision uses for shape representation. Visual-search experiments are reported which assessed the hypothesis of a surface-based (i.e.

An ERP study on hostile attribution bias in aggressive and nonaggressive individuals.

Hostile attribution bias (e.g., tendency to interpret the intention of others as hostile in ambiguous social contexts) has been associated with impulsive aggression in adults, but the results are mixed and the complete sequence of hostile inferential processes leading to aggression has not been investigated yet.

Neural mechanisms underlying attribution of hostile intention in nonaggressive individuals: An ERP study.

Although the perception of hostile intentions in other people can have a clear adaptive function, researchers have paid little attention to the capacity of nonaggressive individuals to infer hostile intentions in others. The goal of the present study was to study brain mechanisms associated with expectations of hostile/non-hostile intent and their on-line evaluation. Scenarios with a hostile versus non-hostile social context followed by a character's ambiguous aversive behavior were presented to readers, and we recorded and analyzed event-related brain potentials (ERPs) to critical words that disambiguated the hostile versus non-hostile intent behind the behavior.

Decoding the Locus of Covert Visuospatial Attention from EEG Signals.

Visuospatial attention can be deployed to different locations in space independently of ocular fixation, and studies have shown that event-related potential (ERP) components can effectively index whether such covert visuospatial attention is deployed to the left or right visual field. However, it is not clear whether we may obtain a more precise spatial localization of the focus of attention based on the EEG signals during central fixation. In this study, we used a modified Posner cueing task with an endogenous cue to determine the degree to which information in the EEG signal can be used to track visual spatial attention in presentation sequences lasting 200 ms.

Stereo and shading contribute independently to shape convexity-concavity discrimination.

The present study examined the joint contribution of shading and stereopsis to the perception of shape convexity-concavity. The stimuli were the images of a synthetic convex 3-D shape seen from viewpoints leading to ambiguity as to its convexity. Illumination came from either above or below, and from either the right or the left, and stimuli were presented dichoptically with normal binocular disparity, reversed disparity, or no disparity.