Intuitive judgments of proportions, means, and variances: A review

Recent investigations of intuitive statistical inference have been far less optimistic regarding man’s ability as an “intuitive statistician” than were Peterson and Beach in 1967. Work on judgments of variance and central tendency formed a significant part of Peterson and Beach’s review but is now regarded as peripheral. Work in this area is discussed in this review and it is concluded that it yields some understanding of the Peterson and Beach view, as subjects appear to be reasonably competent “intuitive arithmeticians.” However, it is pointed out that these tasks involve a “lower level” type of statistical judgment and that several nonnormative biases are observed, even at this level. This review arises from research conducted by the author while employed on a Social Science Research Council grant held by Dr. J.St.B.T. Evans.     

Prevalence of various depressive symptoms in a sample of the general population.

Data on prevalence of and demographics associated with various symptoms of depression are reported for a sample of the general population. Of the nine symptoms assessed, the most frequently occurring were dysphoric mood (17.8%), increased sleep (15%), and loss of interest in other people or activities previously enjoyed (11.8%). 39% of subjects reported one or more symptoms of depression. 8% of subjects reported wondering if life is worth living, a symptom that in and of itself is suggestive of clinically significant depression. The number of depressive symptoms reported was related to income, education, age, and residence (city versus county), but not to sex. The findings provide evidence that various symptoms of depression may be more common in the general population than previously suspected.     

Human reasoning: Some possible effects of availability

This paper discusses some possible ways in which the availability heuristic (Tversky and Kahneman, 1973) may mediate subjects' responses to experimental ‘reasoning’ tasks. A brief review of some effects of availability in other areas is given and then the application of availability to reasoning data is considered with respect to problems employing both ‘thematic’ and ‘abstract’ content.In the case of thematic content, it is argued, with reference to a variety of studies, that to produce a differential effect (to abstract content), the content must provide available cues, resulting from the subjects' experience. Differential effects of content are thus interpreted as differential effects of availability. When abstract content is used, there are cues available from the experimental situation itself, and it is shown that several known error tendencies readily lend themselves to an explanation in terms of availability.In the final section, it is pointed out that a focus on available cues, rather than logical structure, provides a psychological, rather than logical, approach to human reasoning. It is argued that a bias may be psychologically, although not logically, optimal in that it may often produce correct responses in ‘real life’. Accordingly, the possible real life utility of availability is considered, and several ways in which the bias may lead to usually correct decisions are discussed. Given this, it is argued that availability is an effective heuristic and that observed biases on a range of experimental tasks may thus be interpreted as resulting from the application of a behavior that is optimal within the limits of human cognition. However, it is concluded that limitations in both deterministic and probabilistic problem solving may lead to a consistent, but erroneous, view of the world.     

Average faces are average faces

Photographs of faces of young adult male and female Scots were measured on nineteen frontal dimensions. Measures in each dimension were converted to z-scores and summed for each face. For each sex, the ten faces closest to the average summed z-score and the ten most distant from it were rated for attractiveness by white male and female New Zealand undergraduates. Raters agreed significantly in ordering the faces in attractiveness, but did not rate faces close to the “population” average differently from those distant from it. Tested for the first time with actual rather than contrived faces, the commonly reported hypothesis that faces representing the average of a population are attractive is not supported.     

Pornography and sexual aggression

This paper reviews work on the relation between pornography and sexual aggression, covering experimental research on arousal, attitudes, and laboratory aggression, and some correlational studies. The termpornography is intended to cover the materials used in the relevant research, although not all of these would necessarily be seen as “pornographic.” The main body of the review is divided between “aggressive” and “not specifically aggressive” pornography, with some consideration in the discussion of the nature of supposedly “nonaggressive” pornography. In the case of sexually aggressive pornography, a variety of undesirable effects have been observed. Males show equal sexual arousal to pornographic rape depictions and consenting intercourse depictions under certain “disinhibiting” circumstances, such as anger or depicted victim pleasure, and these disinhibitors can also produce increased laboratory aggression against female targets by males exposed to aggressive pornography. Aggressive and, to some extent, not specifically aggressive pornography have also been found to increase the endorsement of attitude statements that are supportive of sexual aggression. The paper concludes with a discussion of ethical considerations, possible psychological bases of the effects, and the question of censorship. It is concluded that although several types of materials may produce behavioral orientation toward, and/or attitudinal support for, sexual aggression, this is a function of aggression and dominance themes rather than the explicitness of the sexual cues. These themes extend beyond explicit pornography, through extremely violent stimuli that lack explicit sexual elements, to widely consumed “normal” films and reading matter.     

PMF: a stereo correspondence algorithm using a disparity gradient limit

The advantages of solving the stereo correspondence problem by imposing a limit on the magnitude of allowable disparity gradients are examined. It is shown how the imposition of such a limit can provide a suitable balance between the twin requirements of disambiguating power and the ability to deal with a wide range of surfaces. Next, the design of a very simple stereo algorithm called PMF is described. In conjunction with certain other constraints used in many other stereo algorithms, PMF employs a limit on allowable disparity gradients of 1, a value that coincides with that reported for human stereoscopic vision. The excellent performance of PMF is illustrated on a series of natural and artificial stereograms. Finally, the differences between the theoretical justification for the use of disparity gradients for solving the stereo correspondence problems presented in the paper and others that exist in the stereo algorithm literature are discussed.     

A meta‐analysis of home visiting programs: Moderators of improvements in maternal behavior

A meta‐analysis of home visiting programs for at‐risk families (K = 35, N = 6,453) examined differences in the effects of programs on maternal behavior. On average, programs with more frequent visitation had higher success rates. The frequency of home visits explained significant variance of effect sizes among studies in the United States, with two visits per month predicting a small, substantive effect. Intensive programs or programs with at least three visits per month were more than twice as effective as were less intensive programs. Home visiting programs using nurses or mental health professionals as providers were not significantly more effective than were programs using paraprofessionals. In general, programs showed a positive effect on maternal behavior, but programs with frequent home visits were more successful.     

The role of competition in word learning via referent selection

Previous research suggests that competition among the objects present during referent selection influences young children’s ability to learn words in fast mapping tasks. The present study systematically explored this issue with 30‐month‐old children. Children first received referent selection trials with a target object and either two, three or four competitor objects. Then, after a short delay, children were tested on their ability to retain the newly fast‐mapped names. Overall, the number of competitors did not affect children’s ability to form the initial name–object mappings. However, only children who encountered few competitors during referent selection demonstrated significant levels of retention. Results and implications are discussed in terms of the role of competition in studies of children’s fast mapping. The relationship between referent selection and full word learning is also discussed.