To the Editor.—
A recent article by Jacobs and Bender (Arch Neurol 33:289, 1976) warrants clarification of Bell phenomenon. Bell implied that an upward rotation of the eyes took place during any brief eye closure.1 However, Hall2 questioned the presence of Bell phenomenon during a spontaneous blink because of its short duration. A few attempts to estimate an upward ocular rotation during a blink yielded a figure of a few degrees at most.3.4Evaluation of 225 Right-Handed Focal Brain-Damaged Patients No. (%) of Patients With Left Hemisphere Lesions Aphasic Nonaphasic Right Hemisphere Lesions Literate (n = 182) 115 (63) 42 (23) 25 (14) Illiterate (n = 43) 29 (67) 5 (12) 9 (21)200μV I SECElectro-oculogram of a blink by a normal individual when eyes are in primary position, with both eyes open (A) and after the left eye is closed (B). (Electroencephalograph with the time constant 0.12 seconds.)
Matsuo F. Absence of Bell Phenomenon During a Blink. Arch Neurol. 1976;33(9):662. doi:10.1001/archneur.1976.00500090068017
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