Learning generalization in problem solving by a blue-fronted parrot (<Emphasis Type="Italic">Amazona aestiva</Emphasis>)

Pepperberg (The Alex studies: cognitive and communicative abilities of gray parrots. Harvard University Press, Cambridge;1999) showed that some of the complex cognitive capabilities found in primates are also present in psittacine birds. Through the replication of an experiment performed with cotton-top tamarins (Saguinus oedipus oedipus) by Hauser et al. (Anim Behav 57:565-582; 1999), we examined a blue-fronted parrot's (Amazona aestiva) ability to generalize the solution of a particular problem in new but similar cases. Our results show that, at least when it comes to solving this particular problem, our parrot subject exhibited learning generalization capabilities resembling the tamarins'.     

The application of the first order system transfer function for fitting the 3-arm radial maze learning curve

A mathematical model is described based on the first order system transfer function in the form Y=B3∗exp(−B2∗(X−1))+B4∗(1−exp(−B2∗(X−1))), where X is the learning session number; Y is the quantity of errors, B2 is the learning rate, B3 is resistance to learning and B4 is ability to learn. The model is tested in a light-dark discrimination learning task in a 3-arm radial maze using Wistar and albino rats. The model provided good fits of experimental data under acquisition and reacquisition, and was able to detect strain differences among Wistar and albino rats. The model was compared to Rescorla-Wagner, and was found to be mutually complementary. Comparisons with Tulving’s logarithmic function and Valentine’s hyperbola and the arc cotangent functions are also provided. Our model is valid for fitting averaged group data, if averaging is applied to a subgroup of subjects possessing individual learning curves of an exponential shape.     

Learning from explaining: does it matter if mom is listening?

The goal of the current study was to examine whether explaining to another person improves learning and transfer. In the study, 4- and 5-year-olds (N=54) solved multiple classification problems, received accuracy feedback, and were prompted to explain the correct solutions to their moms, to explain the correct solutions to themselves, or to repeat the solutions. Generating explanations (to selves or moms) improved problem-solving accuracy at posttest, and explaining to mom led to the greatest problem-solving transfer. The study indicates that explanation prompts can facilitate transfer in children as young as 5 years and reveals that it matters if mom is listening.     

AI,ME AND LEWIS (ABELIAN IMPLICATION,MATERIAL EQUIVALENCE AND C I LEWIS 1920)

C I Lewis showed up Down Under in 2005, in e-mails initiated by Allen Hazen of Melbourne. Their topic was the system Hazen called FL (a Funny Logic), axiomatized in passing in Lewis 1921. I show that FL is the system MEN of material equivalence with negation. But negation plays no special role in MEN. Symbolizing equivalence with → and defining ∼A inferentially as A→f, the theorems of MEN are just those of the underlying theory ME of pure material equivalence. This accords with the treatment of negation in the Abelian l-group logic A of Meyer and Slaney (Abelian logic. Abstract, Journal of Symbolic Logic 46, 425–426, 1981), which also defines ∼A inferentially with no special conditions on f. The paper then concentrates on the pure implicational part AI of A, the simple logic of Abelian groups. The integers Z were known to be characteristic for AI, with every non-theorem B refutable mod some Zn for finite n. Noted here is that AI is pre-tabular, having the Scroggs property that every proper extension SI of AI, closed under substitution and detachment, has some finite Zn as its characteristic matrix. In particular FL is the extension for which n = 2 (Lewis, The structure of logic and its relation to other systems. The Journal of Philosophy 18, 505–516, 1921; Meyer and Slaney, Abelian logic. Abstract. Journal of Symbolic Logic 46, 425–426, 1981; This is an abstract of the much longer paper finally published in 1989 in G. G. Priest, R. Routley and J. Norman, eds., Paraconsistent logic: essays on the inconsistent, Philosophica Verlag, Munich, pp. 245–288, 1989). Meyer was supported in this work as a Visiting Fellow in the College of Engineering and Computer Science, ANU.     

The origins of concepts

Certain of our concepts are innate, but many others are learned. Despite the plausibility of this claim, some have argued that the very idea of concept learning is incoherent. I present a conception of learning that sidesteps the arguments against the possibility of concept learning, and sketch several mechanisms that result in the generation of new primitive concepts. Given the rational considerations that motivate their deployment, I argue that these deserve to be called learning mechanisms. I conclude by replying to the objections that these mechanisms cannot produce genuinely new content and cannot be part of genuinely cognitive explanations.

4.5-month-old infants’ learning, retention and use of object boundary information

4.5-month-old infants can use information learned from prior experience with objects to help determine the boundaries of objects in a complex visual scene (Needham, 1998; Needham, Dueker, & Lockhead, 2002). The present studies investigate the effect of delay (between prior experience and test) on infant use of such experiential knowledge. Results indicate that infants can use experience with an object to help them to parse a scene containing that object 24 (Experiment 1). Experiment 2 suggests that after 24 h infants have begun to forget some object attributes, and that this forgetting promotes generalization from one similar object to another. After a 72-h delay, infants did not show any beneficial effect of prior experience with one of the objects in the scene (Experiments 3A and B). However, prior experience with multiple objects, similar to an object in the scene, facilitated infant segregation of the scene 72 h later, suggesting that category information remains available in infant memory longer than experience with a single object. The results are discussed in terms of optimal infant benefit from prior experiences with objects.     

Montserratian mothers’ and English teachers’ perceptions of teaching and learning

After the explosion of a previously dormant volcano in Montserrat (an island in the Caribbean, in the Leeward Islands of the West Indies, overseas territory of the UK) in 1996, about 3000 people emigrated to England. As the children settled into English schools, the pattern of underachievement observed with previous West Indian immigrants started to repeat itself. However, a new fact emerged: Montserratian parents were unhappy with the standards of mathematics and science in English schools, which they considered low. This paper reports a case study of how two Montserratian mothers and their four children perceived English schools. The parents, a Montserratian and an English teacher were interviewed about their views of teaching and learning. The parents were also videotaped while helping their children with homework; the English teacher watched one of these tapes and commented on the session.The interviews and videos were analysed by themes. The interpretation of the themes identified in the interviews was later checked against the events in the homework sessions. Different implicit conceptions of school emerged from the analysis: Montserratian schools appear to fit an ‘interdependent’ style of socialisation whereas English schools fit a more ‘independent’ style. These implicit conceptions of schooling resulted in misunderstandings between teachers and parents, who did not perceive each other as truly helping the children. Differences were also observed in implicit teaching and learning aims. These differences seem to explain the Montserratian parents’ perceptions of a low standard of work being asked of their children in English schools.It is suggested that teachers of immigrant children would find it useful to understand pupils’ and parents’ implicit conceptions of schools when they receive immigrants in their community. Their communication with parents might work better if it fits with the parental expectations and parents have time to learn the ways of schooling in the host country.     

Achievement and avoidance motivational orientations in the domain of mentoring

To extend research on fundamental motivational orientations into a new domain, we explored the achievement (positive) and avoidance (negative) orientations of formal organization-based mentors and protégés as joint predictors of personal learning experienced by both parties. We also examined the extent of mentoring functions provided by mentors as a hypothesized partial mediator. Regression analyses of 8-month data from 61 dyads revealed that mentors’ personal learning was predicted by protégés’ achievement (positive) and avoidance (negative) orientations, whereas protégés’ personal learning was predicted by their own achievement orientation (positive). Although the extent of mentoring functions facilitated personal learning equally among mentors and protégés, it did not function as a mediator. Finally, mentor-protégé congruence on achievement orientation had implications for the personal learning of protégés.     

The role of avoidance of emotional material in the anxiety disorders

Many psychotherapeutic traditions have conceptualized clinical levels of anxiety as resulting from the avoidance of threatening or emotional material. In this paper, we examine behavioral models of avoidance of emotions and emotional material, integrating findings that support established behavioral theories of emotional avoidance and anxiety, and that extend these theories to further explain the intense, intrusive, and interfering nature of clinical anxiety. Research on the suppression and avoidance of emotional material suggests that emotional avoidance and thought suppression may not only hinder the learning process and maintain anxious responding, but may also (a) paradoxically heighten anxious responding to threatening cues and (b) interfere with emotion functionality, thereby further impeding adaptive responding. Findings are discussed in terms of future research and implications for clinical treatment of anxiety disorders.     

Heroic DVD portrayals: What US and Taiwanese adolescents admire and understand

Viewing media aggression can be a risk factor for the long-term well being of viewers, and heroes have been targeted as a major risk factor in this relationship because they commit justified acts of aggression. However, little is known about the specific aspects of heroic conduct that viewers find worthy of emulation. We examined US and Taiwanese adolescents' and college students' identification with, and perceptions of, heroic characters portrayed in a DVD narrative as well as their comprehension of the narrative. Those who thought that certain characters were heroes were more likely to identify with them. However, the qualities that viewers found attractive in heroes were compassion and thinking before using force, not aggression or vengeance. Those who did not understand the program well were more likely to identify with the villain, and they were also more likely to misattribute prosocial qualities to the villain. The results suggest that at least for older viewers, heroic behavior is admired and emulated for prosocial rather than antisocial conduct, and that poor plot-comprehension is one factor that contributes to younger viewers' identification with, and imitation of, antisocial role models.