Reduction Invariance and Prelec's Weighting Functions

Within the framework of separable utility theory, a condition, called reduction invariance, is shown to be equivalent to the 2-parameter family of weighting functions that Prelec (1998) derived from the condition called compound invariance. Reduction invariance, which is a variant on the reduction of compound gambles, is appreciably simpler and more easily testable than compound invariance, and a simpler proof is provided. Both conditions are generalized leading to more general weighting functions that include, as special cases, the families of functions that Prelec called exponential-power and hyperbolic logarithm and that he derived from two other invariance principles. However, of these various families, only Prelec's compound-invariance family includes, as a special case, the power function, which arises from the simplest probabilistic assumption of reduction of compound gambles. Copyright 2001 Academic Press.     

Torgerson’s conjecture and Luce’s magnitude production representation imply an empirically false property

The prediction presented is based upon the empirically well sustained magnitude production representation that arose in both of Luce’s global psychophysical theories for subjective intensity of binary and unary continua coupled with Torgerson’s (1961) conjecture that respondents fail to distinguish subjective differences from subjective ratios. When applied to eqisections and fractionation the conjecture implies that the cognitive distortion function of the magnitude production representation is the identity function, which is firmly rejected by existing data.     

Life Events and Prosocial Behaviors Among Young Adults: Considering the Roles of Perspective Taking and Empathic Concern

The authors examined the altruism born of suffering model in a culturally diverse sample of young adults. They hypothesized that major life events would interact with perspective taking to predict empathic concern, which would predict multiple types of prosocial behaviors among young adults. The sample included 202 young adults (M age = 20.94?years; 76.5% girls; 36.5% White, 50.5% Latino) who reported on their exposure to major life events, perspective taking and empathic responding, and tendency to engage in six forms of prosocial behaviors. Life events indirectly, positively predicted prosocial behaviors via empathic concern. Empathic concern and perspective taking also interacted to predict empathic responding. The results demonstrated links that support the altruism born of suffering model, suggesting that life stressors might not always be negative and might promote resilience and social connection among young adults under specific conditions.     

Pre-counseling Education for Low Literacy Women at Risk of Hereditary Breast and Ovarian Cancer (HBOC): Patient Experiences Using the Cancer Risk Education Intervention Tool (CREdIT)

The Cancer Risk Education Intervention Tool (CREdIT) is a computer-based (non-interactive) slide presentation designed to educate low-literacy, and ethnically and racially diverse public hospital patients at risk of Hereditary Breast and Ovarian Cancer (HBOC) about genetics. To qualitatively evaluate participants’ experience with and perceptions of a genetic education program as an adjunct to genetic counseling, we conducted direct observations of the intervention, semi-structured in person interviews with 11 women who viewed CREdIT, and post-counseling questionnaires with the two participating genetic counselors. Five themes emerged from the analysis of interviews: (1) genetic counseling and testing for breast/ovarian cancer was a new concept; (2) CREdIT’s story format was particularly appealing; (3) changes in participants’ perceived risk for breast cancer varied; (4) some misunderstandings about individual risk and heredity persisted after CREdIT and counseling; (5) the context for viewing CREdIT shaped responses to the presentation. Observations demonstrated ways to make the information provided in CREdIT and by genetic counselors more consistent. In a post-session counselor questionnaire, counselors’ rating of the patient’s preparedness before the session was significantly higher for patients who viewed CREdIT prior to their appointments than for other patients. This novel educational tool fills a gap in HBOC education by tailoring information to women of lower literacy and diverse ethnic/racial backgrounds. The tool was well received by interview participants and counselors alike. Further study is needed to examine the varied effects of CREdIT on risk perception. In addition, the implementation of CREdIT in diverse clinical settings and the cultural adaptation of CREdIT to specific populations reflect important areas for future work.     

Process Versus Outcome Thought Focus and Advertising

Recent social psychological research demonstrates that certain types of mental simulation are particularly useful for helping individuals reach the future they envision (e.g., Taylor, Pham, Rivkin, & Armor, 1998). More specifically, Taylor's (Pham, Taylor, 1999; Taylor et al., 1998) recent research indicates that the most successful simulations focus on the process of reaching a goal rather than on the outcomes or attainment of the goal. In this article, we extend consideration of process‐ versus outcome‐focused thought to advertising. In studies manipulating the focus of participants’ thoughts while viewing a print advertisement, we find that process‐focused thought results in significantly higher behavioral intentions than outcome‐focused thought when advertisement arguments are strong. However, in the case of weak advertisement arguments, process‐focused thought actually lowers behavioral intentions compared to thoughts focusing on the end result or outcome of product usage. Thus, in addition to increasing the persuasive power of strong advertising claims, process‐focused thinking appears to make individuals better or more discerning consumers who do not form behavioral intentions when it is inappropriate to do so.     

A SUPERVISION PROGRAM FOR INCREASING FUNCTIONAL ACTIVITIES FOR SEVERELY HANDICAPPED STUDENTS IN A RESIDENTIAL SETTING

This study was designed to increase the amount of time severely handicapped students living in a residential facility engaged in age-appropriate and functional activities. After a brief in-service training, a program involving instructions to supervisors and staff feedback was implemented in a multiple-baseline design across settings. Results showed that after the supervision program was implemented, the students' participation in activities increased. Further, these increases maintained when feedback was reduced from an average of 3 days a week during treatment, to once a month for a 5-month period.     

The bow and sequential effects in absolute identification

The bow and sequential effects in absolute identification are investigated in this paper by following two strategies: (1) Experiments are performed in which sequential dependencies in signal presentations are manipulated, and 12) analyses are conducted (some of which are largely free of model-specific assumptions) which bear directly on the question of the origin of the sequential effects. The main result of the study is that absolute identification performance is greatly improved in a design in which each signal lies close to the preceding signal presented, even though the entire range of signals used is the same as in a random presentation design. This finding is consistent with the attention-band model of Luce, Green, and Weber (1976) and rejects hypotheses that suggest that the variability in the signal representation in absolute identification is a function solely of the range of signals being used. However, nonparametric analyses of sequential response errors show that a plausible assumption concerning the trial by-trial movement of the attention band provides an incomplete explanation of Seluential effects in absolute identification. These results are far better explained in terms of systematic shifts of category boundaries in a Thurstonian model, as suggested by Purks, Callahan, Braida, and Durlach (1980). Experiments are also performed which suggest that memory decay is not the major factor accounting for the bow effect in absolute identification.     

Attention bands in absolute identification

If both the number of one-dimensional signals and their range are sufficiently large (about 7 and 20 dB for loudness), the information transmitted in absolute identification is not much increased by increasing either variable (Miller, 1956; Braida & Durlach, 1972). The data can be represented in terms of Thurstonian discriminal dispersions in which the variance is proportional to the square of the signal range in decibels (Durlach & Braida, 1969; Gravetter & Lockhead, 1973), but it is by no means obvious what sorts of mechanisms would lead to this model. An alternative is proposed, namely, that there is a roving attention band, about 10 to 15 dB wide, such that signals falling within the band are represented by a sensory sample size about an order ot magnitude larger than when the same signal falls outside the band. With reasonable choices for parameters, including the subjective continuum growing as a power function of intensity with an exponent about 3, this nicely accounts for the data. In an attempt to examine the change of performance with range, we replicated the BraidaoDurlach experiment with many additional points. These data are not, however, adequate to decide between the two models.