Abstract

Time estimation was measured in 23 smokers, 21 non-smokers, and seven ex-smokers. All smokers abstained from smoking for 1 h prior to the session. The subjects performed a temporal estimation task of a short interval (10 s) with and without feedback, using a computerized method. The task included three training trials, immediately followed by 10 test trials. There was a significant interaction between group, feedback and trial (p<0·03). Only in the smoker group did time estimation differ in the presence or absence of feedback: subjects overestimated to a greater degree without feedback than with feedback. These findings are discussed in relation to the effects of abstinence of smoking, suggesting that even a very short abstinence period implies a modification in the correcting effects of feedback. Copyright © 1998 John Wiley & Sons, Ltd.

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