Rats build and update topological representations through exploration

Although rats are able to build complex spatial representations of their surroundings during exploration, the nature of the encoded information is still a matter for debate. In particular, it is not well established if rats can process the topological structure of the environment in such a way that they are aware of the connections existing between remote places. Here, rats were first exposed for four 5-min trials to a complex environment divided into several sectors that were separated by doors allowing either unrestricted or restricted access to other sectors. In the fifth test trial, we measured the behavior of the animals while they explored the same environment in which, however, they faced changes that either altered or did not alter the topological structure of the environment. In experiment 1, closing previously opened doors prevented the rat from having direct access between corresponding sectors. In experiment 2, opening previously closed doors allowed direct access between sectors that had not been directly accessible. In each experiment, control doors allowed us to discard the mere influence of door manipulation. We compared the rats’ exploratory behavior in response to door manipulations that either strongly altered or did not alter the ability to commute between sectors and found evidence that the animals displayed differential reactions to the two types of door manipulations. This implies that during exploration rats build a precise map of the connectivity of space that can be flexibly updated and used for efficient navigation.     

Item and order information in semantic memory: students’ retention of the “CU fight song” lyrics

University of Colorado (CU) students were tested on memory for the “CU Fight Song” in order to examine serial position effects in semantic memory while controlling for familiarity across positions. In Experiment 1, students reconstructed the order of the nine lines of the song. Students with previous exposure to the song performed better and showed a more bowed serial position function than did students with no knowledge of the song. Experiment 2 added a task assessing memory of item information. One word was removed and replaced with a blank in each line, and an alternative word was offered as an option, along with the correct word. Students selected the word that fit into each blank and then reconstructed the order of the lines. There was a bow-shaped curve for order reconstruction, but not for item selection, which implies that the serial position function in semantic memory stems from order, rather than item, information.     

ENVISIONING ONESELF AS A LEADER: COMPARISONS OF WOMEN AND MEN IN SPAIN AND THE UNITED STATES

In an examination of aspirations for leadership in the United States and Spain, male and female students envisioned themselves as a chief executive officer, vice president, or mid-level manager in an industry with a feminine image (clothing manufacturing) or a masculine image (auto manufacturing). Although men and women perceived these roles as equally positive, women perceived them as less possible and less facilitative of close relationships and gender relationships. Other gender effects included more positive perceptions of the roles by women in the feminine industry and by men in the masculine industry. Cross-nationally men perceived the roles as more positive than women did only in Spain, and U.S. students perceived the roles as more possible than Spanish students did.     

Questioning Pygmalion in the twenty-first century: the formation,transmission, and attributional influence of teacher expectancies

Teacher expectancy effects, the class of phenomena in which teacher beliefs about students influence student outcomes, are widely believed to operate through recursive processes of teacher-student interaction. Recent work in “wise” interventions has shown profound and robust effects in educational domains, and has attributed these effects to similar recursive processes (Yeager and Walton 2011). In this paper, we lay a foundation for forging connections between what we know about expectancy effects and how we might envision applying that knowledge as a lever in intervention research. We review the evidence for the existence and significance of teacher expectancy effects, as well as their possible mediators, including perceptual biases, confirmation biases, stereotyping, and attributional biases. We also hypothesize that empathy could play a role in mediating a relationship between expectancies and attributions. Finally, we propose a research agenda focused on the transmission, mediation, and attributional effects of teacher expectancies.