Involuntary grasping and groping responses to space-related visual stimuli.
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.
D000328:Adult; D001927:Brain Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009949:Orientation / Q000502:physiology; D010550:Personal Space; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology*; D012021:Reflex, Abnormal / Q000503:physiopathology*; D014057:Tomography, X-Ray Computed; D014110:Touch / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*