Three lines of evidence motivated the studies presented here. These are (1) the well
recognized phenomenon of high rates of smoking in schizophrenia,(2) the existence of …

Schizophrenia patients have been reported to be vulnerable to excessive irrelevant sensory
input and consequently experience cognitive disorganization. Additionally, these patients …

We studied the oscillatory activity of the scalp-recorded EEG in healthy humans performing a
task that required a particular eye-movement response choice according to the shape of a …

Visual-spatial attention enables individuals to orient selectively to objects and/or events in
visual space. In order to orient attention in visual space, attention is first disengaged from its …

The following work was conducted at the Medical Research Council Cognition and Brain
Sciences Unit, Cambridge, UK during the period 1998-2001 under the supervision of Dr …

The current experiment used rapid acquisition event-related FMRI to examine neural
substrates of inhibition of return (IOR) and endogenous versus exogenous attentional …

A research-based, neuropsychological measure based on Michael I. Posner's theory of
anterior/posterior attention systems in visual-spatial selective attention was administered to …

This thesis examines the role of color in object representation using a variant of the Stroop
paradigm (Stroop, 1935). In a series of experiments, observers were presented with pictures …

The human brain processes information in many parallel streams, but mental life is
experienced as a single stream of complex events ranging from episodic memories to object …

Hemispatial neglect (HSN) is an important predictor of poor outcome after stroke. It is
hypothesized to result from the damage to a network for directed attention which involves the …