title: Concurrent activities and instructed human fixed-interval performance.
abstract: Two experiments explored the effects of two types of concurrent activity on human fixed-interval performance. Eight adult subjects were given access to either reading material or a working television set across three fixed-interval values (60 s, 300 s, and 600 s). During Experiment 1, 2 subjects produced "scalloped" patterns and reported no verbal regulation (e.g., counting) in the presence of the reading material, but shifted to low-rate patterns and reported verbal regulation when the reading material was withdrawn. The 2 other subjects in Experiment 1 produced consistent low-rate performances and reported verbal regulation during access to reading material. However, when these subjects were given access to a working television set, they produced scalloped patterns and reported no verbal regulation. During Experiment 2, 4 experimentally naive subjects showed consistent scalloped patterning and no verbal regulation across fixed-interval values when they were allowed to watch television. When access to the television was denied, subjects reliably reported verbal regulation, and low-rate patterns emerged. These behavioral effects focus our attention on the contingencies that control human performance on fixed-interval schedules.
authors.affiliation: Department of Applied Psychology, University College Cork, Ireland.
authors.forename: D
authors.initials: D
authors.lastname: Barnes
authors.forename: M
authors.initials: M
authors.lastname: Keenan
mesh_terms: D000328:Adult; D001519:Behavior; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time; D011932:Reading; D013647:Task Performance and Analysis; D013690:Television; D014705:Verbal Behavior