Abstract
Centre for Research in Human DevelopmentUniversity of Toronto, Mississauga, Ontario, CanadaLocalization responses to octave-band noises with center frequencies at 400 and4000 Hz were obtained from 12-month-old infants, first without reinforcementand with a 5-sec response interval and then with reinforcement and an unlimitedresponse interval. The percentage of correct responses was substantially greaterin the reinforced than in the nonreinforced condition. In a second experiment,12-month-old infants were tested in nonreinforced and reinforced sessions, as inthe previous experiment, with the exception that both sessions incorporated the5-sec response interval. Again, performance was superior in the reinforced ses-sion. It is suggested that auditory detection techniques that omit reinforcementmay be yielding attentional thresholds rather than thresholds of audibility.
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