The effects of the contingence during the visual habituation task in 3 and 6 months old infants]

Thirty-six 3-month old infants and the same number of 6-month old infants underwent three visual habituation procedures differentiated by degree of behavioural contingency. Results showed significant differences between conditions only for the six-month olds: the lower the contingency, the higher the visual fixation scores. Results support some of the propositions that Gergely and Watson (1996, 1999) have put forth regarding the developmental model for detecting contingencies. The results also challenge the traditional model for visual habituation which suggests that varied durations of visual fixation should basically be determined by the visual characteristics of the stimulus.     

Concurrent operant preference assessment to identify social consequences to decrease task latency for adolescents with dual diagnosis

Identifying effective reinforcers to use to increase desired behaviors is essential to the success of an intervention. Conducting preference assessments is a proven method for identification of effective reinforcers. In the current study, reinforcers were identified to decrease the latency of initiation of daily living skills such as laundry, showering, and chores in five individuals with dual diagnoses. A Concurrent Operant Preference Assessment measuring response allocation to social stimuli was completed with each individual to determine preferred consequence to increase task compliance. Results showed that all five participants decreased latency to initiate daily tasks once treatment was implemented compared with that during the baseline phase. These results were perceived as socially acceptable by staff, and the improvement was maintained 2 weeks beyond the completion of treatment.     

Ambition as a motivational basis of organizational and professional commitment: preliminary analysis of a proposed career advancement ambition scale

This study proposes that the ambition to advance in one's career may serve as a motivational basis of organizational and professional commitment. In support of this notion, preliminary evidence of the reliability and construct validity of a proposed Career Advancement Ambition Scale is presented, and exploratory analyses of a secondary data set show that the scale and original scales of organizational and professional commitment can predict turnover intentions. Limitations and implications for future research are discussed.     

Back to the future: A review essay of paul hawken, amory lovins and L. Hunter Lovins’ Natural capitalism and Bjørn Lomberg’s The skeptical environmentalist

Conclusion Despite all the hyperbole, Natural Capitalism is not a great book and even less of a radical concept. Indeed, the "natural" is wholly unnecessary, for most of its "radical insights" amounts to nothing more than a rediscovery of the fundamental tenets of a market economy. Good capitalist entrepreneurs have always been able to figure out that pollution and waste are both inefficient and expensive. They never needed government officials or business consultants to tell them that you can do well financially and environmentally at the same time. In spite of all this, if Natural Capitalism succeeds in convincing a large segment of the population that economic growth needn’t coincide with environmental degradation, it will have played a useful role—perhaps one that long-time advocates of market economies simply cannot play. One nonetheless hopes that Hawken and the Lovins will one day take a good look at what their ancestors achieved and give some credit to writers who made all of their good points—and most of their bad ones—long before they were born. He received his Ph.D. in Geography from the University of Montreal and recently completed a two year post-doctoral fellowship at the Johns Hopkins University. His main research interests are environmental and economic development issues and intellectual property. Much of the research leading to this article was completed while the author was a research fellow at the Political Economy Research Center (Bozeman, Montana) in the Summer of 2000.     

Subjective frequency and imageability ratings for 3,600 French nouns

Subjective frequency and imageability estimates for a sample of 3,600 French nouns were collected from two independent groups of 72 young adults each. Both groups received standard instructions and provided their ratings on a 7-point scale. The timing, sequencing, presentation of lexical stimuli, and recording of responses were controlled by a computer. All estimates of internal consistency and test—retest reliability (≥.98) confirm the high level of precision and reliability of the ratings. Correlations with ratings drawn from similar studies were found to be positive and significant for subjective frequency (r ≥ .85) and for imageability (r ≥ .69). Subjective frequency was positively and significantly correlated with objective frequency estimates drawn from 10 different sources (r ≥ .42). Subjective frequency and imageability were significantly correlated (r=.26), a relationship that was driven primarily by a sudden drop in imageability ratings for words with a subjective frequency rating below 2.5. The methodological implications of these findings are discussed. The ratings can be downloaded as supplemental materials from brm.psychonomic-journals.org/content/supplemental.     

Subjective frequency norms for 330 Spanish simple and compound words

Ratings were collected from 102 native speakers of Spanish on the subjective frequency of occurrence of 330 Spanish words, including 120 deverbal compounds and their constituents. These ratings were found to be highly reliable, whether items were analyzed together or separately by type (i.e., compounds, nouns, verbs), as evidenced by indexes of internal consistency and test-retest reliability that were equal to or greater than.98. The validity of the normative ratings was attested to by statistically significant correlations with objective frequency, estimated at.63 for all items together, and.41,.51, and.78 for compounds, nouns, and verbs, respectively. Among the substantive issues addressed was the potential dependency in ratings for compounds and their associated verb-noun constituents. No relationship was discerned, supporting the idea that compound and constituent ratings are statistically independent in this experimental task. The theoretical and methodological implications of the findings are discussed. The ratings can be downloaded from http://brm.psychonomic-journals.org/content/supplemental.     

Finding parallels in fronto-striatal organization

Evidence suggests that lateral frontal cortex is hierarchically organized such that rostral frontal regions support more abstract representations than caudal regions. A recent fMRI study of language processing proposes that striatum may exhibit an analogous organization. We consider this hypothetical correspondence at both the cognitive and anatomical levels.     

Infants' Processing of Causal and Noncausal Events at 3.5 Months of Age

Infants' processing of causal (direct launching) and noncausal (delayed reaction, launching without collision) events was investigated with 30 infants who were 3.5 months old. The habituation-dishabituation technique was used. Results showed that the infants did not process direct launching as causal. However, their pattern of responding revealed a tendency to key on the spatial and temporal properties of the events. Those findings are discussed in terms of their compatibility with a modular, an information-processing, and a Piagetian framework.     

SIDDS: Simulations in developmental disabilities

SIDDS, or simulations in developmental disabilities, is a computer system that provides students with the opportunity to acquire and practice skills in behavioral psychology. During the simulation, the student assumes the role of a psychologist whose professional duties involve the assessment and treatment of the severe problem behavior displayed by a child with a developmental handicap. Following an introduction to the use of the program, SIDDS guides the student/clinician through a series of steps involved in reducing a behavior problem. With the goal of eliminating the client’s behavior problem, the student/clinician proceeds through referral, problem identification, assessment, functional hypothesis, and treatment stages. This article describes the content and structure of SIDDS and provides a glimpse of what future developments of this system will entail.     

Norms of subjective frequency of use and imagery for a sample of 1,916 French nouns.

Norms of rated subjective frequency of use and imagery on seven-point scales are reported for 1,916 French nouns. Subjective frequency was defined as the rated frequency of occurrence of words in spoken French, and imagery was defined as the rated case with which a word aroused a mental image. The mean, standard deviation, and percentile rank of the frequency and imagery ratings for each item are presented in the Appendix together with their objective frequency of occurrence in Baudot's (1992) dictionary. Interjudge reliability was assessed by calculating the correlation between the mean ratings of items repeated in the booklet, between the mean ratings obtained from odd-numbered and even-numbered respondents, and by computing the Cronbach alpha statistic for each page of the booklet. These reliability estimates were equal to or greater than .92 for frequency and for imagery, confirming the high level of interjudge consistency. Although the estimates provided by female and male participants were highly correlated (r = .97), the former gave a slightly higher frequency rating to the word sample but a slightly lower imagery rating than the latter did. Moreover, female respondents gave slightly more extreme ratings on the frequency and imagery scales. An analysis of the absolute difference between female and male ratings revealed a discrepancy of one half point or more on 20% of the word sample for frequency and 13% for imagery. On both scales, the mean absolute difference between male and female ratings was larger than that obtained by chance alone. This finding highlights the possibility that some words may not be equally familiar to women and men or may not evoke imagery with the same ease in these groups. Validity estimates for the frequency and imagery ratings were derived from correlations with scale values drawn from other normative studies. These correlation coefficients were equal to or greater than .78 for frequency and .86 for imagery, confirming the high level of consistency between this and other studies. An analysis of the relationship between subjective frequency and imagery ratings indicated that these variables are generally uncorrelated but exceptions occur. In the present study the coefficient of the correlation between subjective frequency and imagery was .24. However, when items with extreme mean frequency were excluded from the calculation, the correlation coefficient dropped to .04 and was no longer significant. Imagery ratings from five independent studies were all positively and significantly correlated with Vikis-Freibergs's (1974) frequency estimates, which were obtained from a free-association task. This finding suggests that word association, as a form of cued recall, may be influenced by several stimulus attributes including prior frequency of association and imagery-evoking value. The pattern of correlation between imagery ratings and text-based frequency estimates is not coherent. It reveals significant correlations only in select cases and no consistent polarity of linear relationship. The main contribution of this research is to provide reliable estimates of subjective frequency and imagery value for a word sample that is larger than those included in previous studies. A close examination of the linear relationship among the various sources of frequency and imagery data underscores the risk of confounding these variables in the selection of lexical stimuli for research.