Overt and covert attention and vibrotactile reaction times: Gaze direction, spatial compatibility and hemispatial asymmetry.

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Abstract
Two vibrotactile RT experiments were performed with the stimulated and responding hand held on one or other side of the body. Subjects could or could not predict which hand would be stimulated and have to respond, and overt gaze was directed to that or to the other (inoperative) hand. The effects were studied of hemispatial asymmetries (present only in the absence of position uncertainty), spatial compatability effects (occurring only in its presence), and overt (directed gaze) and covert (expectancy based) directed attention. Sustained and transient aspects of holding and shifting attention were seen to be important determinants of hemispatial asymmetries.