Graduate School, City University of New York, New York, New York (A.B.) and Central Institute for the Deaf, St. Louis, Missouri (A.E.G., J.S.M.) Address reprint request to Arthur Boothroyd, Graduate School, City University of New York, 33 W 42 Street, New York, NY 10036.
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Boothroyd et al. (1991) studied this question.