The perceptual constancies are at the heart of the scientific and philosophical study of perceptual experience, for they are responsible for our enjoying stable percepts despite fluctuating proximal stimulation. For some time, it has therefore seemed natural to appeal to the constancies as a way of explaining the factivity of perception how (in veridical cases) we present or represent our envir...

The relationships between spatial attention and conscious perception are currently the object of intense debate. Recent evidence of double dissociations between attention and consciousness cast doubt on the time-honored concept of attention as a gateway to consciousness. Here we review evidence from behavioral, neurophysiologic, neuropsychological, and neuroimaging experiments, showing that dis...

A group of fifty epileptic patients were tested with neuropsychological tools for cognitive functions like memory, intelligence, visuomotor coordination, spatial perception and body schema perception. Patients were on carbamazepine and were tested after three months. Seizure improvement was shown to have different effects on different cognitive functions. Memory and intellectual deficits improv...

Cross-language differences in spatial language are not always reflected in nonlinguistic spatial representations. For example, the distinction between support and non-support relations among objects is obligatorily marked by basic spatial terms in English (”on” vs. ”above”), but not in Korean – yet spatial memory is sensitive to this distinction for speakers of both languages. Here, we provide ...

In a series of experimental investigations of a subject with a unilateral impairment of tactile object recognition without impaired tactile sensation, several issues were addressed. First, is tactile agnosia secondary to a general impairment of spatial cognition? On tests of spatial ability, including those directed at the same spatial integration process assumed to be taxed by tactile object r...

The ability to perceive causality is a central human ability constructed from elemental spatial and temporal information present in the environment. Although the nature of causality has captivated philosophers and scientists since antiquity, the neural correlates of causality remain poorly understood. In the present study, we used functional magnetic resonance imaging (fMRI) to generate hypothe...

Visual perception depends strongly on spatial context. A classic example is the tilt illusion where the perceived orientation of a central stimulus differs from its physical orientation when surrounded by tilted spatial contexts. Here we show that such contextual modulation of orientation perception exhibits trait-like interindividual diversity that correlates with interindividual differences i...