Connectionist models of social learning: a case of learning by observing a simple task]

This article proposes a connectionist model of the social learning theory developed by Bandura (1977). The theory posits that an individual in an interactive situation is capable of learning new behaviours merely by observing them in others. Such learning is acquired through an initial phase in which the individual memorizes what he has observed (observation phase), followed by a second phase where he puts the recorded observations to use as a guide for adjusting his own behaviour (reproduction phase). We shall refer to the two above-mentioned phases to demonstrate that it is conceivable to simulate learning by observation otherwise than through the recording of perceived information using symbolic representation. To this end we shall rely on the formalism of ecological neuron networks (Parisi, Cecconi, & Nolfi, 1990) to implement an agent provided with the major processes identified as essential to learning through observation. The connectionist model so designed shall implement an agent capable of recording perceptive information and producing motor behaviours. The learning situation we selected associates an agent demonstrating goal-achievement behaviour and an observer agent learning the same behaviour by observation. Throughout the acquisition phase, the demonstrator supervises the observer's learning process based on association between spatial information (input) and behavioural information (output). Representation thus constructed then serves as an adjustment guide during the production phase, involving production by the observer of a sequence of actions which he compares to the representation stored in distributed form as constructed through observation. An initial simulation validates model architecture by confirming the requirement for both phases identified in the literature (Bandura, 1977) to simulate learning through observation. The representation constructed over the observation phase evidences acquisition of observed behaviours, although this phase alone is not sufficient to ensure accurate reproduction and must be made functional through the production phase (Deakin & Proteau, 2000). Results obtained through a second simulation replicate those produced by Bandura & Jeffery (1973), who observed that the individual tested following the retention phase recalled recorded information better than he realized in the production phase. The outcome of a third simulation shows that, when performing the transfer task, agents performed the task all the more effectively when they were required to learn a simple path which facilitated knowledge transfer to an adjacent situation. New explanatory assumptions of the mechanics of learning through observation may be produced through OLEANNet. Thus, observed deterioration between memorization and production is caused by successive approximations which occur in the acquisition phase then in the production phase. Further, depending on the type of learning undergone by agents, use of representation as a production guide induces a more or less stringent constraint in the approximation of actual behaviour. This results, during the transfer task, in the ability to effectively generalize acquired knowledge where such knowledge is not specifically related to the task at hand. In conclusion, connectionist model architecture appears valid for modeling learning through observation as defined by Bandura (1977). However, certain limitations appear during implementation, especially in terms of the observed behaviour's availability and the planning of produced behaviours that future developments are liable to counter.     

Rational Emotive Behaviour Therapy: A Positive Perspective

Through his development of Rational Emotive Behaviour Therapy (REBT), Albert Ellis was a major contributor to the development of cognitive behaviour therapy. This article reviews key aspects of REBT, the distinction between unhealthy and healthy emotions, and the role irrational and rational beliefs play in relation to these emotions. As with other areas of psychology, the focus of REBT over the years has been dominated by negative emotional experiences. In an attempt to address this and further develop REBT, the present article reviews recent claims from the realm of social psychology that positive illusions promote mental health. Consequently, it is proposed that a similar dichotomy of healthy and unhealthy positive emotions also exists, and a basic framework for working with this positive dichotomy is introduced.     

How do High School Youths’ Educational Experiences Relate to Well-Being? Towards a Trans-Disciplinary Conceptualization

Educational research and practice could benefit from and contribute to multi-disciplinary study of well-being. In particular, research on the well-being of youth within and beyond school may benefit students, educators, administrators, and the community. This review provides a conceptual framework that (a) integrates research on well-being from economics, sociology, psychology and the health sciences, (b) organises this literature within seven domains of inquiry: Having, Being, Relating, Thinking, Feeling, Functioning, and Striving, and (c) highlights research pertinent to senior high school level educational experiences. This framework provides an important foundation from which further research on well-being can be developed.     

Friend or foe? The role of latent inhibition in predator and non-predator labelling by coral reef fishes

In communities of high biodiversity, the ability to distinguish predators from non-predators is crucial for prey success. Learning often plays a vital role in the ability to distinguish species that are threatening from those that are not. Many prey animals learn to recognise predators based on a single conditioning event whereby they are exposed to the unknown predator at the same time as alarm cues released from injured conspecifics. The remarkable efficiency of such learning means that recognition mistakes may occur if prey inadvertently learn that a species is a predator when it is not. Latent inhibition is a means by which prey that are pre-exposed to an unknown species in the absence of negative reinforcement can learn that the unknown animal is likely not a threat. Learning through latent inhibition should be conservative because mistakenly identifying predators as non-predators can have fatal consequences. In this study, we demonstrated that a common coral reef fish, lemon damselfish, Pomacentrus moluccensis can learn to recognise a predator as non-threatening through latent inhibition. Furthermore, we showed that we could override the latent inhibition effect by conditioning the prey to recognise the predator numerous times. Our results highlight the ability of prey fish to continually update the information regarding the threat posed by other fishes in their vicinity.     

Emotional expressions and visual search efficiency: specificity and effects of anxiety symptoms

Although facial expressions are thought to vary in their functional impact on perceivers, experimental demonstration of the differential effects of facial expressions on behavior are lacking. In the present study, we examined the effects of exposure to facial expressions on visual search efficiency. Participants (n = 31) searched for a target in a 12 location circle array after exposure to an angry, disgusted, fearful, happy, or neutral facial expression for 100 ms or 500 ms. Consistent with predictions, exposure to a fearful expression prior to visual search resulted in faster target identification compared to exposure to other facial expressions. The effects of other facial expressions on visual search did not differ from each other. The fear facilitating effect on visual search efficiency was observed at 500-ms but not at 100-ms presentations, suggesting a specific temporal course of the facilitation. Subsequent analysis also revealed that individual differences in fear of negative evaluation, trait anxiety, and obsessive-compulsive symptoms possess a differential pattern of association with visual search efficiency. The experimental and clinical implications of these findings are discussed.     

A model for the time-order error in contrast discrimination

Trials in a temporal two-interval forced-choice discrimination experiment consist of two sequential intervals presenting stimuli that differ from one another as to magnitude along some continuum. The observer must report in which interval the stimulus had a larger magnitude. The standard difference model from signal detection theory analyses poses that order of presentation should not affect the results of the comparison, something known as the balance condition (J.-C. Falmagne, 1985, in Elements of Psychophysical Theory). But empirical data prove otherwise and consistently reveal what Fechner (1860/1966, in Elements of Psychophysics) called time-order errors, whereby the magnitude of the stimulus presented in one of the intervals is systematically underestimated relative to the other. Here we discuss sensory factors (temporary desensitization) and procedural glitches (short interstimulus or intertrial intervals and response bias) that might explain the time-order error, and we derive a formal model indicating how these factors make observed performance vary with presentation order despite a single underlying mechanism. Experimental results are also presented illustrating the conventional failure of the balance condition and testing the hypothesis that time-order errors result from contamination by the factors included in the model.     

The effectiveness of a biblio-based support group for hoarding disorder

Compulsive hoarding is characterized by the acquisition of, and failure to discard, a large number of possessions and clutter that prevents the use of living spaces as intended. Current successful treatments such as individual and group cognitive-behavioral therapy are lengthy and costly, requiring a time commitment ranging from four to twelve months, trained clinicians to administer treatment, and multiple home visits. Nonprofessional interventions may provide a cost-effective pre-treatment, adjunct, or alternative for individuals who want to work on hoarding problems but are unable or unwilling to engage in treatment. The purpose of the present study was to investigate the effectiveness of an innovative program consisting of a 13-session non-professionally facilitated biblio-based, action-oriented support group using Tolin, Frost, and Steketee’s (2007b) self-help book. In study 1, seventeen self-identified hoarding participants experienced significant decreases in clutter, difficulty discarding, and excessive acquisition from pre-treatment to post-treatment, with reductions evident at mid-treatment. Study 2 replicated the findings of study 1 using interview and observational measures taken in participants’ homes. These findings suggest that a facilitated biblio-based group may be a promising intervention for hoarding disorder.     

Establishing a Diversity Program is Not Enough: Exploring the Determinants of Diversity Climate

Purpose  

This study provides an organizational level investigation of the determinants of perceptions of diversity climate among employees.