Covert Shift of Attention - TAP 2.3
Covert shift of attention refers to the ability to focus visual attention to part of the surrounding space without changing the direction of gaze. This shift of attentional focus may be elicited exogenously by stimuli that catch the eye, or endogenously by voluntary orientation of attention to an expected or given event at a point in space.
In the present task, a central cue (an arrow directed to the left or right) indicates the expected side of the target stimulus. This allows the examination of endogenous control of attention of focus. The cue is correct (valid) in 80 per cent of the trials and incorrect (invalid) in 20 per cent. Following an invalid cue, attentional focus is initially shifted to the cued side (orienting), after which there is a new shift of focus to the actual occurrence of the target stimulus (reorienting).
The instruction screen of the subtest "Covert shift of attention" of TAP 2.3 (to get a larger view (1024*768) - opening in a new browser window - please click on the image)
Execution time: 4,5 minutes