“…Monkeys, for example, required more training trials with correction to produce as high a p(Ai) on a spatial (but not on a visual) problem, as they evidenced on the same spatial problem without correction (Wilson, 1960;Wilson & Rollin, 1959). Cats (Poland & Warren, 1967) and rats also take longer to maximize on spatial tasks with correction (Johnson, 1970;Parducci & Polt, 1958;Uhl, 1963).…”