Great bowerbirds create theaters with forced perspective when seen by their audience

Birds in the infraorder Corvida [1] (ravens, jays, bowerbirds) are renowned for their cognitive abilities [2–4], which include advanced problem solving with spatial inference [4–8], tool use and complex constructions [7–10], and bowerbird cognitive ability is associated with mating success [11]. Great bowerbird males construct bowers with a long avenue from within which females view the male displaying over his bower court [10]. This predictable audience viewpoint is a prerequisite for forced (altered) visual perspective [12–14]. Males make courts with gray and white objects that increase in size with distance from the avenue entrance. This gradient creates forced visual perspective for the audience; court object visual angles subtended on the female viewer’s eye are more uniform than if the objects were placed at random. Forced perspective can yield false perception of size and distance [12, 15]. After experimental reversal of their size-distance gradient, males recovered their gradients within 3 days, and there was little difference from the original after 2 wks. Variation among males in their forced-perspective quality as seen by their female audience indicates that visual perspective is available for use in mate choice, perhaps as an indicator of cognitive ability. Regardless of function, the creation and maintenance of forced visual perspective is clearly important to great bowerbirds and suggests the possibility of a previously unknown dimension of bird cognition

Cognitive development in a secondary science setting

Observations were made of the progressive change in the cognitive development of 141 students over the course of their secondary education in an Australian private school. Cognitive development was measured in years 8, 10 and 12 using Bond's Logical Orerations Test. Rasch analysis of each of the data sets provided ability estimates for students in the year groups of 1993 (year 8), 1995 (year 10) and 1997 (year 12). Twenty-nine students from the year group of 1993 were tested on all three occasions. We analysed data from these 29 students in order to investigate the children's cognitive development across years 8, 10 and 12. We also examined the influence of the Cognitive Acceleration through Science Education (CASE)Thinking Science program on the cognitive development and scholastic achievement of these students. We found increased mental growth between years 8 and 10 for most students in the Thinking Science cohort, which could not be predicted from their starting levels. There was a significant correlation between cognitive development and the scholastic achievement of these students. Although boys as a group were more advanced in cognitive development than girls in years 8 and 10, no difference was found in the rate of cognitive change based on sex up to year 10. However girls showed cognitive gains across years 10–12 which were not found in boys. The students who were new to the school also showed increased cognitive development in years 11 and 12. Students who had experienced the Thinking Science course were more cognitively developed than students who joined the school after the intervention had taken place. This study supports the claim of Adey and Shayer that there is a relationship between cognitive development and scholastic achievement, even though we used different measures of cognitive development and scholastic achievement

Social problem-solving processes and mood in college students: an examination of self-report and performance-based approaches

Previous research has consistently linked poor problem-solving with depression and anxiety. However, much of this research has failed to directly assess real-life problem-solving, relying on self-appraisal or responses to hypothetical problems. This study examined real-life problem-solving in three groups of college students: non-depressed/non-anxious controls; anxious; and mixed depressed/anxious. Participants completed a diary of the interpersonal problems they encountered, and their attempts to solve them. Real-life social problem-solving was also assessed by asking participants to recall past problem solutions. Participants also completed the Social Problem-Solving Inventory-Revised (SPSI-R) and the Mean Ends Problem Solving (MEPS) task. The real-life problem-solving tasks revealed significant differences between the groups, with the mixed depression/anxiety participants exhibiting less effective strategies compared to the control group. However, there were no group differences in MEPS performance, or within the constructive problem-solving style component of the SPSI-R. No deficits were found within the anxious group. Both the anxious and the mixed depressed/anxious groups expressed negative attitudes towards problem-solving. Results have implications for social problem-solving research and suggest that current assessment procedures may be unable to detect impairments in real life problem-solving. Therefore a diary procedure where individuals record their response to the problems they encounter in everyday life may prove a valuable addition to the current battery of assessment procedures