A parametric analysis of errors of commission during discrete-trial training

We investigated the effects of systematic changes in levels of treatment integrity by altering errors of commission during error-correction procedures as part of discrete-trial training. We taught 3 students with autism receptive nonsense shapes under 3 treatment integrity conditions (0%, 50%, or 100% errors of commission). Participants exhibited higher levels of performance during perfect implementation (0% errors). For 2 of the 3 participants, performance was low and showed no differentiation in the remaining conditions. Findings suggest that 50% commission errors may be as detrimental as 100% commission errors on teaching outcomes.     

Temporal discounting predicts student responsiveness to exchange delays in a classroom token system

Typical assessments of temporal discounting involve presenting choices between hypothetical monetary outcomes. Participants choose between smaller immediate rewards and larger delayed rewards to determine how the passage of time affects the subjective value of reinforcement. Few studies, however, have compared such discounting to actual manipulations of reward delay. The present study examined the predictive validity of a temporal discounting procedure developed for use with children. Forty-six sixth-grade students completed a brief discounting assessment and were then exposed to a classwide intervention that involved both immediate and delayed reinforcement in a multiple baseline design across classrooms. The parameters derived from two hyperbolic models of discounting correlated significantly with actual on-task behavior under conditions of immediate and delayed exchange. Implications of temporal discounting assessments for behavioral assessment and treatment are discussed.     

Age-related differences in profiles of mood-change trajectories

As a group, older adults report positive affective lives. The extent to which there are subgroups of older adults whose moods are less positive, however, is unclear. Our aim in the present study was to identify and characterize different subgroups of adults who exhibit distinct trajectories of mood change across a relatively short time period. Seventy-nine young and 103 older adults continuously reported their moods while viewing emotional and neutral faces. Cluster analysis revealed four subgroups of mood-change trajectories. Both the most positive and the most negative subgroups included more older than young adults (ps < .05), suggesting that not all older adults exhibit higher positive affect than young adults. Analyses of variance revealed that the most negative group exhibited slower processing speed, more state anxiety and neuroticism, and looked less at happy faces than the other groups (ps < .05). The results are discussed from an adult developmental perspective, focusing on the increased variability of mood trajectories in the older adults and whether this is a reflection of adaptive functioning or a potential harbinger of dysfunction.     

Discriminatory peer aggression among children as a function of minority status and group proportion in school context

This study investigates discriminatory peer aggression among primary school aged children as a function of minority status (based on nationality, ethnicity, religion) of the target and the relative proportions of minority and majority children in the school. Participants were 925 8‐ to 12‐year‐olds attending schools in Britain. Children of minority status were no more likely than children of majority background to experience peer aggression in general. However, minority children were more likely to experience being the victims of discriminatory aggression. Two contrasting predictions were tested: that discriminatory aggression would be more likely when the minority group was relatively small in number or, alternatively, that as the proportions of children of minority backgrounds increased across schools, discriminatory aggression would be greater. The latter hypothesis was supported. Findings also revealed that in schools with a lower minority presence, discriminatory aggression experienced by majority children was significantly lower than that reported by minority children. When the school minority rate exceeded 81%, discriminatory aggression was more commonly experienced among majority children than among minority children. Copyright © 2011 John Wiley & Sons, Ltd.     

Fuzzy sets to describe driver behavior in the dilemma zone of high-speed signalized intersections

The Type II dilemma zone describes a segment of road on the approach to a signalized intersection where, if occupied by a motorist presented with the circular yellow indication, is likely to result in a motorist having difficulty deciding to stop at the stop line or proceed through the intersection. This phenomenon results in increased frequency of three failure conditions: rear-end collision at the stop line (excessive deceleration rates), the more severe right-angle crashes in the intersections, and left-turn head-on collisions (both resulting from incorrect estimates of clearance time). A more effective boundary definition for Type II dilemma zones could contribute to the safe design of signalized intersections. The prevailing approaches to dilemma zone delineation include the consideration of the vehicle’s travel time to the stop line or the driver’s likelihood of stopping at a particular distance from the stop line. The imprecision of the driver’s perception of speed and distance suggest that fuzzy logic may contribute to the identification of the Type II dilemma zone boundaries. A fuzzy logic (FL) model was constructed and validated from driver’s empirically observed behavior at high-speed signalized intersections. The research resulted in an increased understanding of the phenomenon which, when applied to the timing of signals and the placement of vehicle detection, can improve the overall safety of signalized intersections.     

Fanon via Lacan,or: Decolonization by Psychoanalytic Means … ?

ABSTRACT

Lacanian psychoanalysis is often considered antithetical to Frantz Fanon's decolonizing political project. This paper argues, by contrast, that by exploring hitherto under-explored aspects of the Fanon-Lacan relation we are able to re-articulate many of Fanon's most crucial political insights. The paper adopts three routes of enquiry. Firstly, it investigates Fanon's earliest citations of Lacan, noting how Fanon utilizes Lacan's ideas of historically-situated forms of madness, (mis)recognition, paranoia and psychic causality. Secondly, it highlights a series of conceptual affinities that exist between the work of the two theorists including idea of sociogeny, the importance of symbolic (or social) structure, the notion of fantasy and of a social (or transindividual) unconscious. Thirdly, it provides an instructive example of how Fanon's theorizations of colonial oppression might be supplemented by means of Lacanian social theory especially in respect of how the colonized are positioned as "non-subjects" relative to the master-signifier of whiteness.     

Reading without phonology?

Responses to items such as brane are slower and/or more error prone than responses to items such as slint in lexical decision (is this string spelt like a real word?). The received view is that this “pseudohomophone” effect is attributable to phonological receding. Taft (1982) has challenged this view, offering instead a grapheme-grapheme account which assumes that graphemes that map onto a common phoneme develop the ability to activate each other without reference to phonological mediation.

Taft's grapheme-grapheme account is tested in two experiments. Experiment 1 shows that the presentation of a pseudohomophone facilitates the response to a subsequently presented word (e.g., groce-gross). Experiment 2 shows that nonword letter strings that are translatable into words by the application of putative grapheme-grapheme rules (e.g., gloce-gloss) produce no facilitation. These results are consistent with the notion of a phonological influence but inconsistent with the grapheme-grapheme account. Loci for this pseudohomophone priming effect are discussed.     

A zero-bounded model of operant demand

Contemporary approaches for evaluating the demand for reinforcers use either the Exponential or the Exponentiated model of operant demand, both derived from the framework of Hursh and Silberberg (2008). This report summarizes the strengths and complications of this framework and proposes a novel implementation. This novel implementation incorporates earlier strengths and resolves existing shortcomings that are due to the use of a logarithmic scale for consumption. The Inverse Hyperbolic Sine (IHS) transformation is reviewed and evaluated as a replacement for the logarithmic scale in models of operant demand. Modeling consumption in the “log₁₀-like” IHS scale reflects relative changes in consumption (as with a log scale) and accommodates a true zero bound (i.e., zero consumption values). The presence of a zero bound obviates the need for a separate span parameter (i.e., k) and the span of the model may be more simply defined by maximum demand at zero price (i.e., Q₀). Further, this reformulated model serves to decouple the exponential rate constant (i.e., α) from variations in span, thus normalizing the rate constant to the span of consumption in IHS units and permitting comparisons when spans vary. This model, called the Zero-bounded Exponential (ZBE), is evaluated using simulated and real-world data. The direct reinstatement ZBE model showed strong correspondence with empirical indicators of demand and with a normalization of α (ZBEn) across empirical data that varied in reinforcing efficacy (dose, time to onset of peak effects). Future directions in demand curve analysis are discussed with recommendations for additional replication and exploration of scales beyond the logarithm when accommodating zero consumption data.     

Against Unconditional Love

Abstract While unconditional love is frequently regarded as the best kind of romantic commitment, our commitments in general are not thought to be unconditional. In other contexts, we think conditional commitment (commitment which can in some sense be rendered intelligible by appeal to reasons) to be superior. This paper examines the peculiar status of unconditional love in the romantic context and argues that it is unwarranted; the best kind of romantic commitment should be viewed as conditional. The first part of the paper examines and criticises those arguments which attempt to defend conditional love by appeal to the idea that love is based upon the properties of the beloved. The second part of the paper examines Harry Frankfurt's narrowly subjective conception of unconditional love and highlights certain counterintuitive consequences of it. The final section of the paper argues that the best kind of love will prompt us to adopt two perspectives with regard to the beloved. While loving does involve the narrowly subjective perspective defended by Frankfurt, it also demands that we strive for a more objective perspective, which takes into consideration the reasons we might be able to offer to render our commitment intelligible to others.