Efficient statistics, common currencies and the problem of reward-harvesting

The mammalian brain is equipped with reward-harvesting mechanisms that efficiently categorize and value the behavioral choices that lead to rewards necessary for survival. In this context, 'efficiency' embodies the idea of achieving maximum returns for minimal energetic investments and places a premium on how an animal represents its available options. But the capacity to efficiently represent choices is a profoundly difficult problem because representations for behavioral choice depend intimately on the statistics of information arriving not just from the sensory world and but also from within the creature itself. Any complete account of decision-making in mammals must efficiently connect the internal needs to the perceptual apparatus available to a creature moment-to-moment.     

Color and psychological functioning: the effect of red on performance attainment

This research focuses on the relation between color and psychological functioning, specifically, that between red and performance attainment. Red is hypothesized to impair performance on achievement tasks, because red is associated with the danger of failure in achievement contexts and evokes avoidance motivation. Four experiments demonstrate that the brief perception of red prior to an important test (e.g., an IQ test) impairs performance, and this effect appears to take place outside of participants' conscious awareness. Two further experiments establish the link between red and avoidance motivation as indicated by behavioral (i.e., task choice) and psychophysiological (i.e., cortical activation) measures. The findings suggest that care must be taken in how red is used in achievement contexts and illustrate how color can act as a subtle environmental cue that has important influences on behavior.     

Early adolescent empathy, parental support, and antisocial behavior

In this two-wave prospective study, the authors investigated whether level of dispositional affective empathy moderated the association between parental support and antisocial behavior in early adolescents. The sample consisted of 823 Dutch boys and girls (mean age = 12.8 years) enrolled in the first year of secondary education. Higher levels of affective empathy were associated with less delinquent and aggressive behavior. Contrary to expectations, structural equation modeling did not indicate that youth with higher levels of affective empathy were susceptible to parental support. Further analyses showed that gender moderated the association between parental support and future delinquent and aggressive behavior. Only for girls, were high levels of parental support associated with lower levels of antisocial behavior.     

Increased Cognitive Load during Video Game Play Reduces Rape Myth Acceptance and Hostile Sexism after Exposure to Sexualized Female Avatars

The present study investigated how task demand (cognitive load and interactivity) and avatar sexualization in a video game influenced rape myth acceptance (RMA), hostile sexism, and self-objectification. In a between-subjects design, 300 U.S. college students either played or watched someone else play a videogame as either a sexualized or non-sexualized female avatar under high (memorize 7 symbols) or low (memorize 2 symbols) cognitive load. Hypotheses were derived from the limited capacity model of motivated mediated message processing (LC4MP) and perspectives on stereotype processing. Results contradicted hypotheses that greater task demands and sexualization would produce greater RMA, hostile sexism, and self-objectification. Instead, we found that sexualization did not affect these variables. Greater cognitive load reduced rape myth acceptance and hostile sexism for those in the sexualized avatar condition, but it did not affect self-objectification. We discuss these results with respect to the LC4MP and suggest that the processing of stereotype-inconsistent information might be the underlying cause of these unexpected findings. These results provide tentative evidence that cognitively demanding video game environments may prompt players to focus on stereotype-inconsistent, rather than stereotype-consistent, social information.     

The similarity heuristic

Decision makers often make snap judgments using fast‐and‐frugal decision rules called cognitive heuristics. Research into cognitive heuristics has been divided into two camps. One camp has emphasized the limitations and biases produced by the heuristics; another has focused on the accuracy of heuristics and their ecological validity. In this paper we investigate a heuristic proposed by the first camp, using the methods of the second. We investigate a subset of the representativeness heuristic we call the “similarity” heuristic, whereby decision makers who use it judge the likelihood that an instance is a member of one category rather than another by the degree to which it is similar to others in that category. We provide a mathematical model of the heuristic and test it experimentally in a trinomial environment. In this environment, the similarity heuristic turns out to be a reliable and accurate choice rule and both choice and response time data suggest it is also how choices are made. We conclude with a theoretical discussion of how our work fits in the broader “fast‐and‐frugal” heuristics program, and of the boundary conditions for the similarity heuristic. Copyright © 2009 John Wiley & Sons, Ltd.     

A COMPARISON OF THE EFFECTS OF FIXED AND VARIABLE RATIO SCHEDULES OF REINFORCEMENT ON THE BEHAVIOR OF DEAF CHILDREN

The performance of all five students in an adjustment class for deaf children was compared under fixed and variable ratio schedules of reinforcement. During the fixed ratio (FR) condition, students earned checks if they were attentive and did not engage in disruptive behavior. These checks could be exchanged for the opportunity to draw a prize from a grab bag. During the variable ratio (VR) condition, they earned a draw from the grab bag according to a variable ratio schedule with a mean ratio equal to the value of the preceding FR schedule. During the VR condition, students visually attended more and engaged in disruptive behavior less often than during the FR condition. The number of math problems completed per minute was also higher during the VR condition although no specific consequences were applied to math performance.     

Studying the vocational counseling process: A preliminary examination

In this study, we examined the effects of counselor empathic and coping/mastery self-disclosure statements on clients' impressions of an initial vocational counseling interview. A primary purpose of our study was to reconsider one aspect of the investigation of Watkins et al(1990), in which the counselor responses of self-disclosure, self-involvement, empathy and open question were found to have no differential effects on clients' impressions of vocational counseling. Even though we attempted to provide a more specific test of empathy versus self-disclosure responses, we for the most part also obtained a general lack of significance on the dependent variables. In conjunction with Watkins et al.'s findings, we provide some discussion of our results, and their potential meanings for vocational counseling and future vocational counseling research.     

Friendship Context Matters: Examining the Domain Specificity of Alcohol and Depression Socialization Among Adolescents

Driven by existing socialization theories, this study describes specific friendship contexts in which peer influence of alcohol misuse and depressive symptoms occurs. In the fall and spring of the school year, surveys were administered to 704 Italian adolescents (53?% male, M (age)?=?15.53) enrolled in Grades 9, 10 and 11. Different friendship contexts were distinguished based on two dimensions referring to the level (i.e., best friendships and friendship networks) and reciprocity (i.e., unilateral and reciprocal) of the relationships. Social network and dyadic analyses were applied in a complementary manner to estimate peer socialization effects across the different friendship contexts. Results showed that within friendship networks both male and female adolescents' alcohol misuse was affected by friends' alcohol misuse, regardless of whether the relationship was reciprocated or not. Conversely, peer socialization of depressive symptoms only emerged within very best friendship dyads of female adolescents. Findings suggest that the effects of peer socialization depend on the friendship context and specific types of behaviors. The theoretical and methodological implications of the findings are discussed.     

Computational heterogeneity in the human mesencephalic dopamine system

Recent evidence in animals has indicated that the mesencephalic dopamine system is heterogeneous anatomically, molecularly, and functionally, and it has been suggested that the dopamine system comprises distinct functional systems. Identifying and characterizing these systems in humans will have widespread ramifications for understanding drug addiction and mental health disorders. Model-based studies in humans have suggested an analogous computational heterogeneity, in which dopaminergic targets in striatum encode both experience-based learning signals and counterfactual learning signals that are based on hypothetical information. We used brainstem-tailored fMRI to identify mesencephalic sources of experiential and counterfactual learning signals. Participants completed a decision-making task based on investing in markets. This sequential investment task generated experience-based learning signals, in the form of temporal difference (TD) reward prediction errors, and counterfactual learning signals, in the form of “fictive errors.” Fictive errors are reinforcement learning signals based on hypothetical information about “what could have been.” An additional learning signal was constructed to be relatable to a motivational salience signal. Blood oxygenation level dependent responses in regions of substantia nigra (SN) and ventral tegmental area (VTA), where dopamine neurons are located, coded for TD and fictive errors, and additionally were related to the motivational salience signal. These results are highly consistent with animal electrophysiology and provide direct evidence that human SN and VTA heterogeneously handle important reward-harvesting computations.