For about twenty years I have been eliciting certain ocular signs in cases of Parkinson's disease (paralysis agitans), and I believe that the observations merit a short report. I have called these signs the "tap reaction" and the "thrust response."
THE TAP REACTION
This response is obtained when the bridge of the nose and/or the forehead up to the hair line is tapped gently with the forefinger. In the positive reaction the eyes close spasmodically, and against the will of the patient, with each tap, and will close as often as the tap is repeated. In certain extreme positive responses the eyes close spasmodically, and after the first tap remain closed throughout the tapping and do not open again until it ceases.In normal persons a few blinks are obtained when the forehead and the bridge of the nose are tapped in this manner. This reaction ceases after the first
Myerson A. TAP AND THRUST RESPONSES IN PARKINSON'S DISEASE. Arch NeurPsych. 1944;51(5):480. doi:10.1001/archneurpsyc.1944.02290290067012
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