Delayed symbolic matching in honeybees (Apis mellifera)

In a recent experiment on short-term memory (P. A. Couvillon, T. P. Ferreira, & M. E. Bitterman, 2003), honeybees (Apis mellifera) learned to choose between 2 colors on the basis of immediately preceding experience with 1 of them. Some learned to choose the same color as the sample (perseveration or matching), others to choose the alternative color (alternation or nonmatching). Performance in the 2 problems was very much the same. In the present experiment, honeybees learned no less readily to choose between the 2 colors on the basis of sample stimuli that were different from the colors (symbolic matching). A simple associative interpretation of the results is proposed.     

Too much of a good thing? Examining the relationship between passion for exercise and exercise dependence

ObjectivesTo examine the relationship between passion (i.e., love for an activity that is valued for which and a great deal of time is invested) for exercise and exercise dependence symptoms.DesignA cross-sectional correlational survey design was utilised.MethodA total of 480 participants (n = 275 females, n = 205 males; M_age = 18.58, SD = 1.66) completed the Leisure Time Exercise Questionnaire (Godin, Jobin, & Bouillon, 1986), the Passion Scale (Vallerand et al., 2003), and the Exercise Dependence Scale-Revised (Hausenblas, Symons-Downs, & Nigg, 2004). Path analysis using structural equation modelling was used to assess the relationships between passion and exercise dependence.ResultsPath analysis using structural equation modelling via AMOS 20.0 (Arbuckle, 2011) revealed that harmonious passion (i.e., being in control of the activity and deciding when and when not to engage in it) was positively related to the exercise dependence dimensions of time and tolerance. On the other hand, obsessive passion (i.e., an internal compulsion to engage in the activity even when not appropriate to do so) was positively related to all seven exercise dependence dimensions: time, tolerance, withdrawal, continuance, intention effects, lack of control, and reduction in other activities (CFI = .91, RMSEA = .05, SRMR = .06).ConclusionAn empirical relationship has been established to support the proposed theoretical link between passion (harmonious and obsessive) for exercise and exercise dependence dimensions.     

Sort-Score Correlates of Schizophrenia

The Structured Objective Rorschach Test was administered to 61 schizophrenic patients in a psychiatric hospital. Ss scored within the average range on all but 2 of 27 attributes; these were the attributes Popular and Original. Popular and Original scores were inversely related and differentially related to W, Dd, and F-. When P and O were combined the score for the Conformity attribute was within the average range. A validity scale is discussed.     

Empathic understanding: Benefits of perspective-taking and facial mimicry instructions are mediated by self-other overlap

The current study sought to better understand the utility of two strategies—perspective-taking and facial mimicry—proposed to increase empathic responding. Thirty-seven female participants were presented an interpersonal situation (a betrayal) that would elicit the use of empathic responding to achieve conflict resolution between friends. Each participant was given instructions to partake in either perspective-taking, facial mimicry, or to remain neutral (control condition). The results demonstrated that individuals who engaged in perspective-taking reported significantly higher state empathy than the control condition, but there was no significant difference in state empathy between the mimicry and control condition. Also, those who engaged in either strategy reported significantly higher self-other overlap relative to those not instructed to engage in a particular strategy. Importantly, self-other overlap mediated the association between the instructional sets and state empathy. Both strategies are arguably means of enhancing interpersonal understanding.     

The role of context and timeframe in moderating relationships within the theory of planned behaviour

This study examined the moderating effect of context and timeframe on the predictive ability of Theory of Planned Behaviour (TPB) constructs. Three hundred and eighty-three students completed TPB measures either in a campus bar or a library and were randomly allocated to one of three timeframe conditions: tonight, tomorrow or next week. There was a three-way interaction such that the subjective norms of participants in a bar were more predictive of their intentions to binge drink that night, whereas the subjective norms of participants in a library were less predictive of intentions to binge drink that night. This research provides empirical evidence that ignoring context may result in underestimation of the importance of normative factors in binge drinking. It also suggests that other research utilising the TPB needs to take greater account of the impact of context of data collection, which has been neglected to date.     

The role of context and timeframe in moderating relationships within the theory of planned behaviour

This study examined the moderating effect of context and timeframe on the predictive ability of Theory of Planned Behaviour (TPB) constructs. Three hundred and eighty-three students completed TPB measures either in a campus bar or a library and were randomly allocated to one of three timeframe conditions: tonight, tomorrow or next week. There was a three-way interaction such that the subjective norms of participants in a bar were more predictive of their intentions to binge drink that night, whereas the subjective norms of participants in a library were less predictive of intentions to binge drink that night. This research provides empirical evidence that ignoring context may result in underestimation of the importance of normative factors in binge drinking. It also suggests that other research utilising the TPB needs to take greater account of the impact of context of data collection, which has been neglected to date.     

Visual information and rubber hand embodiment differentially affect reach-to-grasp actions

During the “rubber hand illusion” (RHI) participants feel touch originating from an artificial hand, which is felt to belong to the own body. The perceived location of the real hand is shifted towards the location of the artificial hand. However, evidence as to whether the RHI is accompanied by alterations of hand action is mixed. We found that the perceived size of one's own hand was affected by the size of the artificial hand that was used to elicit the illusion. Moreover, we tested a possible transfer of the RHI to a reach-to-grasp action. We observed that hand transport (i.e., reach) errors after RHI induction were independent of artificial hand size, showing that the parameter which is important for these reaching errors is the hand's perceived location. Results thus show that the RHI affects not only perceptual, but also action processing. In contrast, grip aperture was affected by artificial hand size independent of the RHI, suggesting that visual information about hand size affects grasping independent of embodiment of the artificial hand. Grip size increased with artificial hand size; this effect is explained by a higher reliance on proprioceptive information during blind reaching after receiving distorted visual information.     

Changes in team cognition after a retention interval: the benefits of mixing it up

This paper examines the retention of team cognition with changes in team membership. Hypotheses are developed from shared cognition and interactive team cognition theories. We report a study of the effects of Short (3-6 weeks) versus Long (10-13 weeks) retention intervals and change (Mixed) versus no change (Intact) in team membership during the interval on shared knowledge, team process, and team performance. The study context was a three-person Unmanned Aerial Vehicle (UAV) simulator. The long retention interval resulted in significantly lower team process scores and, except for the Short-Intact condition, all teams suffered a drop in performance after the break. However, those teams recovered prebreak levels of performance after one UAV mission. The counterintuitive result was that team mixing resulted in significant knowledge and process gains. An exploratory communication analysis indicated that Mixed team communication is longer in duration than Intact team communication, and Long-interval teams communicated more frequently than Short-interval teams. Unlike the Long-interval communication frequency effect, the Mixed team communication duration effect lasted throughout the experiment, suggesting greater interaction experience for Mixed teams. An exploratory mediation analysis indicated that the shared cognition Input-Process-Output framework was a good fit for the Intact team data, but not for the Mixed team data. We conclude that there are team-learning benefits of team mixing and that the interactive team cognition theory accounts better for those benefits than shared cognition theory.