The role of the dorsal striatum and dorsal hippocampus in probabilistic and deterministic odor discrimination tasks

Three experiments explored the contribution of the cortico-striatal system and the hippocampus system to the acquisition of solutions to simultaneous instrumental odor discriminations. Inactivation of the dorsal striatum after rats had reached criterion on a three problem probabilistic set of discriminations--A (80%) vs. B (20%), C (67%) vs. D (33%), E(67%) vs. F(33%)--impaired test performance and disrupted performance when the rats were tested with novel cue combinations (C vs. F and E vs. D), where control animals chose C and F. In contrast, inactivating the dorsal hippocampus enhanced performance on this task and on a deterministic discrimination A (100%) vs. B (0%). These results are consistent with the complementary learning systems view, which assumes that the cortico-striatal and hippocampal system capture information in parallel. How this information combines to influence task performance depends on the compatibility of the content captured by each system. These results suggest that the trial-specific information captured by the hippocampal system can be incompatible with the across-trial integration of trial outcomes captured by the cortico-striatal system.     

Is there a baby in the bathwater? Maybe: some methodological issues for the de novo protein synthesis hypothesis

The de novo protein synthesis hypothesis has a long history and will no doubt continue to influence research. Yet, the primary behavioral evidence for this claim continues to come from studies in which amnesia is produced by broad scale protein synthesis inhibitors such as anisomycin. What is remarkable is the uncritical acceptance of the idea that because anisomycin is a protein synthesis inhibitor then it must have produced amnesia because it prevented translation. Several viable alternative interpretations of such experiments are discussed here and it is concluded that there is nothing to be gained by the continued use of broad-scaled antibiotics to address this hypothesis. Moreover, this approach cannot answer two critical and related questions - why must new proteins be synthesized and what are they? A focus on specific proteins such as those synthesized locally and upregulate the translation of other proteins may be a promising approach to answering these questions.     

What's in it for Me? Motivational Differences between Farmers' Subsidised and Non‐Subsidised Conservation Practices

Through nature conservation practices, farmers can strongly enhance nature quality and biodiversity in rural areas. In this paper, the social psychological underpinnings of farmers' nature conservation practices are investigated using the Theory of Planned Behavior, to which the concepts of self‐identity and personal norms were added. A distinction is made between nature conservation practices done on a non‐subsidised basis and nature conservation practices for which farmers receive some form of remuneration from the Dutch government. Eighty‐five arable farmers participated in our survey. Results show that our model explains more variance in the intention to perform non‐subsidised than subsidised nature conservation practices. Also, the concepts of self‐identity and personal norms appear to be related to the intention to perform non‐subsidised, not subsidised conservation.     

Personality,Social Activities,Job-Search Behavior and Interview Success: Distinguishing Between PANAS Trait Positive Affect and NEO Extraversion

Past research has found that trait positive affect as measured by the Positive and Negative Affect Schedule (PANAS) and extraversion as measured by the NEO-Five Factor Inventory (NEO-FFI) are highly correlated. We examined the relation between these two measures within the context of three social behaviors. Approximately 4 months before graduation, college seniors entering the job market completed the PANAS and the NEO-FFI and reported on their social activities during college. Three months later, these students were contacted again and described their job search strategies and success at obtaining follow-up job interviews. Trait positive affect scores and extraversion scores were highly correlated and both predicted behavior in each of the three areas investigated. Regression analyses indicated that trait positive affect predicted behavior in all three areas after the effects of extraversion were removed. However, extraversion did not add significantly to predicting behavior in any of the three areas after the effects of trait positive affect were removed. The findings have implications for the conceptual relation between extraversion and trait positive affect.     

The Moderating Effect of the Service Context on the Relationship Between Price and Post-Consumption Perceptions of Service Quality

A stream of marketing research indicates that price often affects consumers' pre-purchase perceptions of quality. Interestingly, however, most studies that have assessed the effect of price on quality have utilized physical products rather than services. Moreover, the effect of price on assessments of quality has typically measured before respondents have an opportunity to consume the target product. This paper reports the results of a study that found that the effect of price on post-purchase perceptions of service quality is contingent on consumers' perceptions of contextual cues. Specifically, only when consumers evaluate contextual cues to be worse than their expectations does a higher price increase their perceptions of service quality. Implications of these findings and avenues for future research in services are discussed.