Involuntary grasping and groping responses to space‐related visual stimuli

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Abstract
Involuntary groping‐grasping responses to visual stimuli were studied in relation to the location of the stimuli in the space surrounding the patient. The following space‐related patterns of stimulus‐response were observed in four patients: (a) responses were evoked only by visual stimuli in the hemispace ipsilateral to the arm involved; (b) responses were evoked only by visual stimuli within the reach of maximal arm extension; (c) responses were evoked only by visual stimuli in the space around the hand; (d) all such patterns were variously combined. These findings are discussed in relation to the general problem of specific correlations between sensorimotor subsystems and peripersonal behavioral space.