An experimental and theoretical investigation of the constant-ratio rule and other models of visual letter confusion

The constant-ratio rule (CRR) and four interpretations of R. D. Luce's (In R. D. Luce, R. R. Bush, & E. Galanter (Eds.), Handbook of mathematical psychology (Vol. 1). New York: Wiley, 1963) similarity choice model (SCM) were tested using an alphabetic confusion paradigm. Four stimulus conditions were employed that varied in set size (three, four or five stimulus elements) and set constituency (block letters: A, E, X; F, H, X; A, E, F, H; A, E, F, H, X), and were presented to each subject in independent blocks. The four interpretations of the SCM were generated by constraining one, both, or neither of its similarity and bias parameter sets to be invariant in across-stimulus set model predictions. The strictest interpretation of the SCM (both the similarity and bias parameters constrained), shown to be a special case of the CRR, and the CRR produced nearly equivalent across-set predictions that provided a reasonable first approximation to the data. However, they proved inferior to the least strict SCM (neither the similarity nor bias parameters were constrained; the common interpretation of the SCM in visual confusion). Additionally, the least strict SCM was compared to J. T. Townsend's (Perception and Psychophysics, 1971, 9, 40–50, 449–454) overlap model, the all-or-none model (J. T. Townsend, Journal of Mathematical Psychology, 1978, 18, 25–38), and a modified version of L. H. Nakatani's (Journal of Mathematical Psychology, 1972, 9, 104–127) confusion-choice model. Both the least strict SCM and confusion-choice models produced nearly equivalent within stimulus set predictions that were superior to the overlap and all-or-none within-set predictions. Measurement conditions related to model structure and equivalence relations among the models, many of them new, were examined and compared with the statistical fit results of the investigation.     

Wage rate,nonlabor income,and labor supply in rats

Thirsty rats pressed a lever for water under fixed-ratio schedules, with or without free water at the start of the 1-hr session. Total water intake fell steadily as the fixed-ratio requirement increased; when the fixed-ratio requirements covered a relatively broad range, total lever presses rose and then fell as the requirement increased. Free water decreased total lever presses but increased total intake, especially at the higher fixed-ratio requirements; its effect on total intake proved relatively hard to detect, but grew more apparent as the amount of free water increased. The results conformed more closely to a recent revision of the conservation model than to the original model. By viewing milliliters per press as a wage rate, and free water as nonlabor income, results are brought to bear on predictions derived from economic labor supply theory. In economic terms, rising wage rates were accompanied by a rise followed by a fall in total labor supply, but a steady rise in total income, in conformity with the backward bending labor supply curve. Nonlabor income cut the supply of labor but raised total income, especially at the lower wage rates.     

Hypothesis analysis of sameness-difference learning-set by capuchin monkeys

Sameness-difference discriminations were presented to capuchin monkeys and hypothesis analysis was applied to the data. Learners and nonlearners evidenced differences in overall performance and in relative strengths of hypotheses. Learners initially displayed markedly more random than position responding whereas nonlearners evidenced more position than random responding and remained particularly prone to position habits. Stimulus preference and aversion, suppressed by learners by the end of training, reemerged at the onset of two-object discriminations containing previously preferred and aversive stimuli. Hypothesis analysis indicated that when preferred stimuli were positive the correct hypothesis was more evidenced, and stimulus preference or aversion as well as random hypotheses were less evidenced, than when aversive stimuli were positive.     

A developmental model for the occupational socioeconomic status of American men

Prior research suggested that psychological, sociological and economic variables, measuring both differential and developmental dimensions, must be considered for an exhaustive analysis of adult vocational status. From the resulting estimated predictive model, occupational socioeconomic status was examined through 16 selected family, ecological, educational, ethnoreligious, and political predictor variables. The data were obtained from a national sample of 1355 American men. Factor analysis supported the hypothesized existence of an educational-socioeconomic factor and a political identification factor, plus a less discrete religiousity factor. Path analysis confirmed that a respondent's education, adult social class, and father's occupational socioeconomic status were principle predictors of the respondent's occupational socioeconomic status.     

Occupational mobility as measured by Holland's theory of career selection

This study examined the occupational mobility of men ages 45–59 as measured by Holland's theory of career selection and its relationship to men in the work force. Stability was discussed in two distinct ways: (1) stability within a job, and (2) stability in the kind of work a man does over a career. In his research Holland concluded that Realistic and Investigative personality types would change personality type less often and have more stable job choices in comparison to other personality types. The results of this study supported these findings to some extent, but also concluded that stability in a personality type was strongly influenced by the number of jobs available in a particular personality type and the structure of the labor market demand. In addition the results showed that psychological concepts seem to be more important in changing jobs than in selecting initial jobs.     

Predicting social behavior from personality traits

The classic view of traits as dispositions was examined and a number of ambiguities noted. When clarified, implications for predicting social behaviors from personality variables were derived. Two types of behavioral criterion were delineated, and it was argued that personality measures should be systematically related to multiple act criteria, but not necessarily to single act criteria. It was suggested that behaviors could be treated as items on a behavioral measure of personality and that standard scaling criteria be applied in identifying behaviors that should be related to a given trait dimension. In attempting to identify behaviors which are linearly related to a personality trait, the application of Bayes theorem was shown to be of theoretical interest. Two indices, a validity index and a linearity index, were derived from Bayes theorem and it was shown that validity is a necessary but not sufficient condition for linearity.     

Religion and pseudo-religion: an elusive boundary

This paper examines the possibility of setting a boundary between religion and “pseudo-religion” (or superstition). Philosophers of religion inspired by Ludwig Wittgenstein’s ideas, in particular, insist that religious language-use can be neither legitimated nor criticized from the perspective of non-religious language-games. Thus, for example, the “theodicist” requirement that the existence of evil should be theoretically reconciled with theism can be argued to be pseudo-religious (superstitious). Another example discussed in the paper is the relation between religion and morality. The paper concludes by reflecting on the issue of relativism arising from the Wittgensteinian contention that the religion vs. pseudo-religion division can only be drawn within a religious framework, and on Wittgenstein’s own suggestion that the religious person “uses a picture”.