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When asked to report the" 1st digit that comes to mind," 28.4% of 684 respondents chose 7 and only 2.2% chose 1. In contrast, when asked to report the" 1st 1-digit number that comes to mind," 18.0% of the respondents chose 1 and only 12.1% chose 7. Further experiments studied this phenomenon of response enhancement of availability. It was found that if the digit 1 was mentioned by the experimenter (E) as an example of a response, its frequency was much lower (5.4%) than when it was unobtrusively used by the E in the instructions (18.0%). Another experiment showed that if the 1st 4-digit number that comes to mind was requested, the frequency of 4 as the initial digit was 27.4%, whereas if the 1st number between 1,000 and 9,999 that came to mind was requested, the frequency of 4 as the initial digit was only 4.3%. Together with M. Kubovy and J. Psotka's (1976) findings, these results indicate that Ss initially …