Counterconditioning of memory in rats

Two experiments examined the counterconditioning of an aversively motivated response in rats. Presentation of a highly palatable sugar solution (maltose in Experiment 1; sucrose in Experiment 2) to thirsty rats was used as the counterconditioning treatment. In Experiment 1, the counterconditioning procedure was found to be effective in modifying both a newly acquired and a cue-reactivated fear memory. In Experiment 2, the counterconditioning effect was shown to occur when the fear memory was reactivated with a noncontingent exposure to the unconditioned stimulus rather than the conditioned stimulus. This outcome supports the interpretation of counterconditioning as a modification of some central representation of the original training memory, rather than the acquisition of a competing peripheral response. The methodological implications of the present approach to counterconditioning are considered.     

Anonymity

Anonymity is a form of nonidentifiability which I define as noncoordinatability of traits in a given respect. This definition broadens the concept, freeing it from its primary association with naming. I analyze different ways anonymity can be realized. I also discuss some ethical issues, such as privacy, accountability and other values which anonymity may serve or undermine. My theory can also conceptualize anonymity in information systems where, for example, privacy and accountability are at issue.     

Experience and brain development

This article considers how experience can influence the developing and mature brain and proposes a new categorization scheme based upon the type of information stored and the brain mechanisms that appear to be involved in storing it. In this scheme, experience-expectant information storage refers to incorporation of environmental information that is ubiquitous in the environment and common to all species members, such as the basic elements of pattern perception. Experience-expectant processes appear to have evolved as a neural preparation for incorporating specific information: in many sensory systems, synaptic connections between nerve cells are overproduced, and a subsequent selection process occurs in which aspects of sensory experience determine the pattern of connections that remains. Experience-dependent information storage refers to incorporation of environmental information that is idiosyncratic, or unique to the individual, such as learning about one's specific physical environment or vocabulary. The neural basis of experience-dependent processes appears to involve active formation of new synaptic connections in response to the events providing the information to be stored. Although these processes probably do not occur entirely independently of one another in development, the categories offer a new view more in accord with neural mechanisms than were terms like "critical" or "sensitive period."     

Factor structure,reliability and validity of the Parental Support for Learning Scale: Adolescent Short Form (PSLS-AS)

Parental involvement in children’s learning has been found to influence academic success. However, very few tools exist for measuring parental involvement, particularly ones that target adolescents’ self-report. The present study assessed the factor structure, reliability and convergent validity of a new scale to assess adolescents’ perceptions of their mothers’ and fathers’ educational involvement: the Parental Support for Learning Scale: Adolescent Short Form (PSLS-AS). The PSLS-AS, as well as a questionnaire measuring the risk of high school drop-out, was administered to a sample of 825 youth (aged 13–14 years). Exploratory factor analysis revealed a two-factor structure representing parental involvement: Controlling Involvement and Autonomy Supportive Involvement. Adolescents’ perceptions of their parents’ involvement correlated with a risk of high school drop-out. Implications and future directions for further validation of the PSLS-AS are discussed.