Complex spatial distributions of attention

Attention, spatial integration, and the tail of response time distributions in Stroop task performance.

A few studies have examined selective attention in Stroop task performance through ex-Gaussian analyses of response time (RT) distributions. It has remained unclear whether the tail of the RT distribution in vocal responding reflects spatial integration of relevant and irrelevant attributes, as suggested by Spieler, Balota, and Faust (2000). Here, two colour-word Stroop experiments with vocal r...

Spatial Distributions of Young Stars

We analyze the spatial distribution of young stars in Taurus-Auriga and Upper Sco, as determined from the two-point correlation function (i.e., the mean surface density of neighbors). The corresponding power-law fits allow us to determine the fractal dimensions of each association’s spatial distribution, measure the stellar velocity dispersions, and distinguish between the bound binary populati...

Electrophysiological abnormalities of spatial attention

Objective: We evaluated event-related potentials (ERPs) elicited by attentional disengagement in individuals with autism. Methods: Sixteen adults with autism, 17 adults with mental retardation and 14 healthy adults participated in this study. We recorded the pre-saccade positive ERPs during the gap/overlap task under which a peripheral stimulus was presented subsequent to a stimulus in the cent...

Computational modeling of spatial attention

Hemispheric control of spatial attention.

According to the activation-orienting hypothesis the distribution of attention in space is biased in the direction contralateral to the more activated hemisphere. The present investigation tested this proposal and evaluated the nature of hemispheric differences in orienting control. Activation imbalance was produced by a unilateral visual stimulus. The distribution of attention was measured usi...