“…On the other hand, there are also reports of declines both within sessi ons and between sessions f or a variety of test procedures (Schoenfeld, Antonitus and Bersh, 1950;Anderson, 1938;Berlyne, 1955;Zimbardo and Montgomer,r, 1957;Glickman, 1958). In a third group of experimenta, declines were observed neither within nor between testing sessions (Butler and Alexander, 1955;Butler and Harlow, 1954).…”