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Posner cueing task
The Posner Cueing Task, also known as the Posner paradigm, is a neuropsychological test often used to assess attention. Formulated by Michael Posner, the task assesses an individual’s ability to perform an attentional shift. It has been used and modified to assess disorders, focal brain injury, and the effects of both on spatial attention.
==Method==
Posner's spatial cueing task has been used to measure manual and eye-movement reaction times to target stimuli in order to investigate the effects of covert orienting of attention in response to different cue conditions.
In the general paradigm, observers are seated in front of a computer screen situated at eye level. They are instructed to fixate at a central point on the screen, marked by a dot or cross. To the left and the right of the point are two boxes. For a brief period, a cue is presented on the screen. Following a brief interval after the cue is removed, a target stimulus, usually a shape, appears in either the left or right box. The observer must respond to the target immediately after detecting it. To measure reaction time (RT), a response mechanism is placed in front of the observer, usually a computer keyboard which is pressed upon detection of a target. Following a set inter-trial interval, lasting usually between 2500 and 5000 ms, the entire paradigm is repeated for a set number of trials predetermined by the experimenter. This experimental paradigm appears to be very effective in recasting attentional allocation.〔Bashinski H S, Bacharach V R (1980). Enhancement of perceptual sensitivity as the result of selectively attending to spatial locations. Perception & Psychophysics, 28(3):241-248.〕
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