“…For example, in a visual search paradigm, Schneider and Shiffrin (1977, Experiment 2) found that reaction times in conditions in which subjects could consistently attend and respond to stimuli were 580 msec; when attending was not consistent , reaction times were 1,290 msec. Previous research has shown that, in general, when subjects consistently attend and respond to stimuli, their performance becomes less dependent on processing load , requires less effort, is more accurate, and is faster (e.g., Corballis, 1975;Egeth, Atkinson , Gilmore, & Marcus, 1973;Kristofferson, 1972;Logan, 1978Logan, , 1979Neisser, 1974;Rabbitt, 1978;Schneider & Fisk, 1982a, 1982bSchneider & Shiffrin, 1977;Shiffrin & Schneider, 1977 ; for a review, see Schneider, Dumais, & Shiffrin, 1984).…”