The impact of an unpredictable context and intolerance of uncertainty on the electrocortical response to monetary gains and losses

There is growing evidence that unpredictability and uncertainty can alter reward system functioning. The present study examined the impact of (1) a task-irrelevant unpredictable relative to predictable context and (2) individual differences in intolerance of uncertainty (IU) on the reward-related positivity (RewP), an event-related potential (ERP) response to monetary gains relative to losses. Specifically, 64 participants listened to predictable and unpredictable tone sequences while electroencephalography was recorded during a monetary gambling task. Participants also completed the Intolerance of Uncertainty Scale, which measures both cognitive distress (prospective IU) and behavioral inhibition (inhibitory IU) elicited by uncertainty, in addition to the Depression Anxiety Stress Scale-21 and Penn State Worry Questionnaire. Results indicated that the RewP was reduced during the unpredictable relative to the predictable context. Greater self-reported anxiety elicited by the unpredictable context was associated with a decreased RewP, and a decreased RewP was associated with poorer lose-shift behavioral adjustment. Furthermore, the RewP mediated the relationship between self-reported anxiety elicited by the unpredictable context and lose-shift behavioral adjustment. The IU subscales demonstrated the opposite relationship with the RewP across both contexts—inhibitory IU was associated with an attenuated RewP and prospective IU was associated with an enhanced RewP. In contrast, anxiety, depression, stress, and worry symptomatology were not associated with the RewP. This is the first study to demonstrate that an unpredictable context and individual differences in the degree to which people cannot tolerate uncertainty impact an ERP measure of reward system functioning.     

Memory for event frequency as a function of depression, age, intentionality, and level of processing

In two experiments, we examined memory for event frequency among depressed and/or elderly subjects (depression was either naturally occurring or induced by the Velten technique). We also manipulated level of processing and instructional set to test the notion that memory for event frequency is relatively invariant across a variety of tasks. Results supported the proposal that memory for frequency is robust in the face of depression and old age. Memory for frequency was enhanced, however, by semantic processing and by an intentional learning instructional set. Finally, the results suggest that the Velten technique not only induced variation in mood but also may have induced a semantic processing strategy in our depressed and elated subjects.     

Full-time studying and long-term relationships: Make or break for mature students?

Results are reported of a 2-year longitudinal study looking at the effects of full-time degree study on full-time mature students who were also in long-term committed relationships. The findings from the first year of the research suggested that while there were particular stresses for students with domestic responsibilities; the single most buffering effect was support from the student's partner. The follow-up study in the second year confirmed these findings, but also suggested that there was a decrease in the amount of partner support experienced in the second year. The implications for counselling and student support services are discussed.     

Formation of food aversions in cancer patients receiving repeated infusions of chemotherapy

Patients receiving emetogenic chemotherapy for cancer have been found to develop aversions to normal dietary items consumed in close temporal relation to treatment administrations. These aversions are presumed to develop via conditioning processes as demonstrated in experimental studies of food aversion learning. The present study used a prospective, longitudinal design to evaluate the possible role of conditioning in the formation of aversions to normal dietary items in women receiving adjuvant chemotherapy for breast cancer. Patients were monitored for the development of aversions to foods and beverages consumed in the 24 hr periods before and after each of eight consecutive chemotherapy infusions beginning with the initial infusion. Data on the prevalence, course, and prediction of aversions to normal dietary items are reported. These results pointed to similarities and differences between aversions formed to normal dietary items during chemotherapy treatment and aversions formed to taste stimuli during experimental conditioning studies. In addition to their theoretical significance, results also suggest possible strategies for preventing the clinical problem of aversions to normal dietary items in chemotherapy patients.     

Landmark Discrimination Learning in the Dog

Allocentric spatial memory was studied in dogs of varying ages and sources using a landmark discrimination task. The primary goal of this study was to develop a protocol to test landmark discrimination learning in the dog. Using a modified version of a landmark test developed for use in monkeys, we successfully trained dogs to make a spatial discrimination on the basis of the position of a visual landmark relative to two identical discriminanda. Task performance decreased, however, as the distance between the landmark and the “discriminandum” was increased. A subgroup of these dogs was also tested on a delayed nonmatching to position spatial memory task (DNMP), which relies on egocentric spatial cues. These findings suggest that dogs can acquire both allocentric and egocentric spatial tasks. These data provide a useful tool for evaluating the ability of canines to use allocentric cues in spatial learning.     

The determination of theory by evidence: The case for quantum discontinuity, 1900–1915

The thesis that observation necessarily fails to determine theory is false in the sense that observation can provide overwhelming evidence for a particular theory or even a hypothesis within the theory. The saga of quantum discontinuity illustrates the power of evidence to determine theory and shows how that power can be underestimated by inadequate caricatures of the evidential case. That quantum discontinuity can save the phenomena of black body radiation is the widely known result, but it leaves open the possibilities of other accounts. That these phenomena, with the aid of minimal assumptions, entail quantum discontinuity is the crucial but now largely forgotten result. It was first demonstrated by Ehrenfest and Poincaré in 1911 and 1912.     

Primacy of Affect Over Cognition in Determining Adult Men's Condom–Use Behavior: A Review1

Prior research suggests that failure to use condoms can be understood within the context of condom‐related attitudes. We reviewed quantitative and qualitative literature on adult men's condom‐use attitudes; condom‐related attitudinal beliefs were classified as cognitive (e.g., effectiveness) or affective (e.g., pleasure‐related), and their relationships to behavior were examined. To determine differences in the effects of cognitive and affective beliefs, we conducted a critical qualitative review, a meta‐analysis, and a “vote‐count.” In support of the primacy of affect hypothesis (Zajonc, 1984), cognitive beliefs were weaker predictors of condom use than were affective beliefs. Results suggest that HIV‐prevention interventions will have greater success by addressing negative affective reactions to condom use in addition to promoting the protective value of condoms.