Three experiments examined the effects of changes in retinal locus and locational
uncertainty in the processing of hierarchical stimuli. In Experiment 1, stimuli were presented …

Examined the order in which 24 undergraduates recognize and respond to different levels of
structure within a visual display. Previous experiments show that information about global …

The present experiments were designed to test whether or not processing in visual
information channels defined by spatial position is independent in the visual search …

Two letters varying in level of confusability were presented either simultaneously for 75
msec or sequentially for 75 msec each in adjacent retinal locations. The retinal locus of …

In Experiment 1, subjects responded with a buttonpress to a target letter O embedded in a
pair of vertical lines. A flanker control method was used to constrain the location and size of …

Three experiments examined the flexibility of attention to the color and location dimensions
of visual stimuli. Displays typically consisted of two curved lines, one a target and the other a …

When unrelated letter strings are presented tachistoscopically, the end letters are reported
more often than their neighbors; and when spaces are inserted into strings, performance on …

If several positions must be attended in a large visual display, does the efficiency of
performance vary as a function of the display distance between these to-be-attended …

In order to secure useful information the perceptual system must combine information
present in the retinal counterpart of the to-be-discriminated distal variable with information …

Abstract Navon's (1977) global precedence hypothesis was based primarily on the joint
occurrence of two effects: a response time (RT) advantage for identifying global targets, and …