“…A number of studies have shown some kinds of performance differences between introverts and extraverts on motor tasks (Eysenck, 1956;Lynn, 1960;Meier, 1961;Ray, 1959;Star, 1957;Treadwell, 1956), while others (Bendig & Vaughn, 1959;Rechtschaffen, 1958) have found no differences whatsoever. Eysenck (1957) cites three investigations in support of the hypothesis that introverts and extraverts differ in regards to KAE, but Harvarth (1963), Meier (1961), Norcross, Lipman, and Spitz (1960), and Rechtschaffen and Bookbinder (I960) found no such differences. Moreover, two studies have directly explored the relationship between KAE and work decrement (Lipman & Spitz, 1961;Meier, 1961).…”