Mental rotation and temporal contingencies.

A task that requires subjects to determine whether two forms of the same shape, but in different orientations, are mirror images or identical except for orientation is called a handedness recognition task. Subjects' reaction times (RT) on this task are consistently related to the angular disparity (termed alpha) between the two presented forms. This pattern of data has been interpreted to indicate that subjects solve the task by imagining that one of the forms rotates into the orientation of the other (termed mental rotation). The speed with which one imagines one of the forms rotating has been widely considered a fixed capability of the individual, and thus immune to the effect of contingencies. We present an experiment that assesses the effects of temporal contingencies in a handedness recognition task on the slope of the function RT = f(alpha). The data indicate that the slope of this function can come under the control of temporal contingencies.     

Behaviour therapy for obesity: The role of clinicians in the reduction of overweight

Behaviour therapists are often required to help those who are unhealthily overweight to reduce. Unfortunately, these interventions are often ineffective in the long-term. Many clients never achieve reduced weight. Often, those who do reduce weight are unsuccessful in keeping the weight off. A review of the relevant literature suggests that most therapeutic approaches do not enable people to change their lifestyles in the ways likely to be necessary for permanent reduction of weight to a healthy level. Clinical support for weight reduction would be more effective if it were more culturally realistic and therapeutically sensitive in empowering clients to make informed choices for themselves among sustainable habits of eating and exercise that contribute to negative energy balance. Approaches which encourage client self-efficacy and self-assertion are likely to be more effective in facilitating lasting change.     

Relationship of age and sex-role conflict for professional women in human services

This study provides external validation of the Sex-role Conflict Scale. The relationship between age and sex-role conflict among women with educational interests was investigated. 128 female students in education were assessed on the conflict they experienced in various settings. The mean sex-role conflict scores, although hypothesized to be significantly different, were not among women ages 25 yr. and below, ages 26 to 39 yr., and ages 40 yr. and over. Also investigated was the relationship between age and sex-role conflict in dual-career respondents. Of the 29 respondents who met the criterion for classification, mean sex-role conflict scores were not significantly different for the three age groups. The nonlinear relationship between sex-role conflict and age does not have support for professional women who work in fields other than business.     

Redefining synaesthesia?

In a thought-provoking paper, Simner (2012) highlights and criticizes a number of assumptions concerning synaesthesia. She specifically takes issue with the following assumptions: (1) synaesthesia is strictly a sensory-perceptual phenomenon; (2) consistency of inducer-concurrent pairs is the gold standard for establishing the authenticity of an individual's synaesthesia; and (3) synaesthesia is not heterogeneous. In the wake of this critique, Simner advances a working definition of synaesthesia as a neurological hyper-association that aims to be more inclusive of its variants. We are very sympathetic to Simner's approach and believe that it raises important points that will advance our understanding of synaesthesia. Here we supplement, and sometimes challenge, some of these ideas.     

Cross-group recognition bias generalizes to diverse non-face representations of digital identity

We investigated the potential for cross-group recognition bias, the reliable tendency for perceivers to better recognize people who share their ethnic or social groups than people who do not share their ethnic or social groups, with diverse non-face representations of digital identity. We compared German participants' memory for people they believed to be German or French when those people were identified using non-face pictorial representations of identity (Studies 1 and 2) and verbal written representations of identity (Study 3) taken from the World Wide Web. Participants better recognized ingroup targets than outgroup targets regardless of type of identity representation. These results generalize cross-group recognition bias to an important new domain as well as to a new class of stimuli and suggest that process explanations of cross-group recognition bias that are domain specific to faces do not provide a comprehensive account of the bias.     

Grapheme-color synaesthesia benefits rule-based Category learning

Researchers have long suspected that grapheme-color synaesthesia is useful, but research on its utility has so far focused primarily on episodic memory and perceptual discrimination. Here we ask whether it can be harnessed during rule-based Category learning. Participants learned through trial and error to classify grapheme pairs that were organized into categories on the basis of their associated synaesthetic colors. The performance of synaesthetes was similar to non-synaesthetes viewing graphemes that were physically colored in the same way. Specifically, synaesthetes learned to categorize stimuli effectively, they were able to transfer this learning to novel stimuli, and they falsely recognized grapheme-pair foils, all like non-synaesthetes viewing colored graphemes. These findings demonstrate that synaesthesia can be exploited when learning the kind of material taught in many classroom settings.     

SOS! An algorithm and software for the stochastic optimization of stimuli

The characteristics of the stimuli used in an experiment critically determine the theoretical questions the experiment can address. Yet there is relatively little methodological support for selecting optimal sets of items, and most researchers still carry out this process by hand. In this research, we present SOS, an algorithm and software package for the stochastic optimization of stimuli. SOS takes its inspiration from a simple manual stimulus selection heuristic that has been formalized and refined as a stochastic relaxation search. The algorithm rapidly and reliably selects a subset of possible stimuli that optimally satisfy the constraints imposed by an experimenter. This allows the experimenter to focus on selecting an optimization problem that suits his or her theoretical question and to avoid the tedious task of manually selecting stimuli. We detail how this optimization algorithm, combined with a vocabulary of constraints that define optimal sets, allows for the quick and rigorous assessment and maximization of the internal and external validity of experimental items. In doing so, the algorithm facilitates research using factorial, multiple/mixed-effects regression, and other experimental designs. We demonstrate the use of SOS with a case study and discuss other research situations that could benefit from this tool. Support for the generality of the algorithm is demonstrated through Monte Carlo simulations on a range of optimization problems faced by psychologists. The software implementation of SOS and a user manual are provided free of charge for academic purposes as precompiled binaries and MATLAB source files at http://sos.cnbc.cmu.edu.     

eDom: Norming software and relative meaning frequencies for 544 English homonyms

Words that are homonyms??that is, for which a single written and spoken form is associated with multiple, unrelated interpretations, such as COMPOUND, which can denote an <?enclosure?> or a <?composite?> meaning??are an invaluable class of items for studying word and discourse comprehension. When using homonyms as stimuli, it is critical to control for the relative frequencies of each interpretation, because this variable can drastically alter the empirical effects of homonymy. Currently, the standard method for estimating these frequencies is based on the classification of free associates generated for a homonym, but this approach is both assumption-laden and resource-demanding. Here, we outline an alternative norming methodology based on explicit ratings of the relative meaning frequencies of dictionary definitions. To evaluate this method, we collected and analyzed data in a norming study involving 544 English homonyms, using the eDom norming software that we developed for this purpose. Dictionary definitions were generally sufficient to exhaustively cover word meanings, and the methods converged on stable norms with fewer data and less effort on the part of the experimenter. The predictive validity of the norms was demonstrated in analyses of lexical decision data from the English Lexicon Project (Balota et al., Behavior Research Methods, 39, 445?C459, 2007), and from Armstrong and Plaut (Proceedings of the 33rd Annual Meeting of the Cognitive Science Society, 2223?C2228, 2011). On the basis of these results, our norming method obviates relying on the unsubstantiated assumptions involved in estimating relative meaning frequencies on the basis of classification of free associates. Additional details of the norming procedure, the meaning frequency norms, and the source code, standalone binaries, and user manual for the software are available at http://edom.cnbc.cmu.edu.     

Effect of an Automated Training Presentation on Pre-service Behavior Analysts’ Implementation of Trial-based Functional Analysis

The trial-based functional analysis (FA) is a useful alternative to the traditional FA in contexts in which it is challenging to establish environmental control for extended periods of time. Previous researchers have demonstrated that others can be trained to conduct trial-based FAs with high procedural fidelity by providing a didactic presentation, small group instruction, and then a performance evaluation. However, one barrier to replicating this training sequence is that didactic presentations are not standardized and presentations can vary considerably across different groups of trainers or researchers. We designed an automated didactic presentation with video models embedded throughout for trainers and researchers to use when training others to conduct trial-based FAs. The purpose of this study was to evaluate the effect of this presentation on participant fidelity to trial-based FA procedures. Results demonstrate improved fidelity following the presentation. However, the presentation alone was insufficient to establish consistently high levels of fidelity across all conditions for all participants. Thus, additional training components are required when teaching others to conduct trial-based FAs.     

Modality effects in rhythm processing: Auditory encoding of visual rhythms is neither obligatory nor automatic

Modality effects in rhythm processing were examined using a tempo judgment paradigm, in which participants made speeding-up or slowing-down judgments for auditory and visual sequences. A key element of stimulus construction was that the expected pattern of tempo judgments for critical test stimuli depended on a beat-based encoding of the sequence. A model-based measure of degree of beat-based encoding computed from the pattern of tempo judgments revealed greater beat sensitivity for auditory rhythms than for visual rhythms. Visual rhythms with prior auditory exposure were more likely to show a pattern of tempo judgments similar to that for auditory rhythms than were visual rhythms without prior auditory exposure, but only for a beat period of 600 msec. Slowing down the rhythms eliminated the effect of prior auditory exposure on visual rhythm processing. Taken together, the findings in this study support the view that auditory rhythms demonstrate an advantage over visual rhythms in beat-based encoding and that the auditory encoding of visual rhythms can be facilitated with prior auditory exposure, but only within a limited temporal range. The broad conclusion from this research is that “hearing visual rhythms” is neither obligatory nor automatic, as was previously claimed by Guttman, Gilroy, and Blake (2005).