PROCTOR: An on-line student evaluation and monitoring system for use with PSI format courses

PROCTOR, an on-line interactive system for student evaluation and monitoring in courses employing the PSI format, is described. This system involves a tester module that assumes many of the routine managerial duties traditionally assigned to the student proctor, such as quiz administration and scoring, performance feedback, and complete record keeping. Also, PROCTOR includes a multipurpose editor that allows an instructor to enter, examine, or modify any information in the disk files accessed by the tester. Factors related to the implementation and use of this system are considered, and its advantages for management, quality control, and staffing in PSI courses are discussed.     

The detection of anisochrony in monaural and interaural sound sequences

Nakao and Axelrod (1976) and van Noorden (1975) showed that the threshold for discriminating an anisochronous duple rhythm (a series of clicks with a temporal offset on every other one) from an isochronous rhythm (no offset) is poorer when the clicks are presented alternately to the two ears than when they are presented to the same ears. Van Noorden reported that the difference between the thresholds in the alternating and nonalternating conditions varied with the tempo of the sequence. Nakao and Axelrod found invariance of this threshold difference with sequence speed. According to our quantification of temporal processing of interaural sequences, the latter result should be expected. We carried out five psychophysical experiments to establish interaural and monaural discrimination between isochronous and anisochronous rhythms. Across experiments, base time intervals of 60–720 msec were spanned. The main result was that we replicated the poorer discrimination for interaural sequences. This deterioration in discrimination was the same for all sequence speeds. It was also the case that the thresholds were almost constant up to a sound repetition rate of about 3 per second, but increased linearly with slower rates. This result supports evidence in the literature that temporal processing of sequences faster than about 3–4 sounds per second differs from temporal processing of slower sequences.     

Evaluative language,cognitive effort and attitude change

The present article deals with the effects of the use of evaluatively biased language on attitudes, and with the role of cognitive effort. We tested whether active information processing — formulating arguments on the basis of evaluatively biased language — was a necessary condition for attitude change. Results of the present study support the prediction that using evaluative language can infuence attitudes, but that these effects depend on the amount of cognitive effort.     

Anticipated Regret and Precautionary Sexual Behavior1

This study investigated the impact of anticipated regret on precautionary sexual behavior. Results show that anticipated regret predicts a significant and independent proportion of variance in expectations about future contraceptive behavior. A simple model combining attitudes, subjective norms, perceived behavioral control, and anticipated regret explained 65% of the variance in behavioral expectations. Behavioral expectations explained 34% of the variance in contraceptive behavior of respondents who had casual sex in the 4 weeks following the first session of the study. Implications for our understanding of precautionary sexual behavior and for campaigns aiming to increase safer sexual practices are discussed.     

Belief Importance in Expectancy-Value Models of Attitudes1

In this study, 312 respondents were asked to indicate their attitude toward smoking and their smoking behavior. Attitudes were assessed by a direct attitude measure (4 items) and a series of 15 belief statements about the possible consequences of smoking. Next, respondents were asked to select the 3 consequences they found most important. Attitude scores derived from these important beliefs were more predictive of behavior than those based on all 15 beliefs, and far superior to attitude scores based on the remaining 12 beliefs. Differences between the 2 groups (smokers vs. nonsmokers) were more pronounced when attitude scores were based on important beliefs, and disappeared for scores based on nonselected, less important beliefs. It is argued that incorporating belief importance in expectancy-value models helps to assess the structure of attitudes and could improve our insight in the determinants of behavioral preference.     

Nicolas Bourbaki and the concept of mathematical structure

In the present article two possible meanings of the term mathematical structure are discussed: a formal and a nonformal one. It is claimed that contemporary mathematics is structural only in the nonformal sense of the term. Bourbaki's definition of structure is presented as one among several attempts to elucidate the meaning of that nonformal idea by developing a formal theory which allegedly accounts for it. It is shown that Bourbaki's concept of structure was, from a mathematical point of view, a superfluous undertaking. This is done by analyzing the role played by the concept, in the first place, within Bourbaki's own mathematical output. Likewise, the interaction between Bourbaki's work and the first stages of category theory is analyzed, on the basis of both published texts and personal documents.Several persons have read and criticized earlier drafts of this paper. I thank them all for forcing me to formulate my ideas more simply and convincingly. Special thanks are due to Professors Pierre Cartier (Bures-sur-Yvette), Giorgio Israel (Rome), and Andrée C. Ehresmann (Amiens) for stimulating and illuminating conversations.