Cue competition effects in the planarian

The learning abilities of planarian worms (Dugesia tigrina) were assessed by using a number of Pavlovian conditioning paradigms. Experiment 1 showed that planaria were susceptible to basic conditioning in that they readily developed a conditioned response to a change in ambient luminance when it was consistently paired with an electric shock over a number of trials. In Experiment 2, the change in luminance was presented in a compound with a vibration stimulus during conditioning. Subsequent tests revealed poor conditioning of the elements compared with control groups in which the animals were conditioned in the presence of the elements alone, an instance of overshadowing. In Experiment 3, pre-training of one of the elements before compound conditioning resulted in blocking of learning about the other element. These results add to other studies that have reported cue competition effects in animal species belonging to different phyla (chordate, mollusk, arthropod), suggesting that learning in these phyla could be ruled by similar principles. The results are discussed adopting an evolutionary-comparative approach.     

The development of stranger fear in infancy and toddlerhood: normative development,individual differences,antecedents, and outcomes

Despite implications that stranger fear is an important aspect of developing behavioral inhibition, a known risk factor for anxiety, normative and atypical developmental trajectories of stranger fear across infancy and toddlerhood remain understudied. We used a large, longitudinal data set (N = 1285) including multi‐trait, multi‐method assessments of temperament to examine the normative course of development for stranger fear and to explore the possibility that individual differences exist in trajectories of stranger fear development between 6 and 36 months of age. A latent class growth analysis suggested four different trajectories of stranger fear during this period. Stable, high levels of stranger fear over time were associated with poorer RSA suppression at 6 months of age. Rates of concordance in trajectory‐based class membership for identical (monozygotic) and fraternal (dizygotic) twins, along with associations between atypical stranger fear development and greater anxiety‐related maternal characteristics, suggested that individual differences in developmental trajectories of stranger fear may be heritable. Importantly, trajectories of stranger fear during infancy and toddlerhood were linked to individual differences in behavioral inhibition, with chronically high levels of stranger fear and sharp increases in stranger fear over time related to greater levels of inhibition than other developmental trajectories.     

When soft voices die: auditory verbal hallucinations and a four letter word (love)

Understandings of auditory verbal hallucinations (also referred to as “hearing voices”), and help for people distressed by them, are dominated by a biomedical framework. Yet, many people who have sought help for the distress and/or impairment caused by hearing voices express dissatisfaction with treatment solely within this framework, highlighting the need for a more rounded, biopsychosocial-spiritual approach. This paper examines the neglected role of a fundamental part of human experience, love, in the experience of hearing voices. First, we argue a lack of love is likely to play a causal role in voice-hearing experiences. Second, we demonstrate that a lack of love is central to the distress and dysfunction often caused by hearing voices. Finally, we show that love plays a core role in recovery. Given this centrality of love, we argue that an interdisciplinary approach to hearing voices involving the mind sciences and theology/religion may be fruitful. The relevance of this for psychotherapeutic interventions for people who hear voices is discussed.     

Stroop Interference,Practice, and Aging

We report two experiments that investigate practice effects on Stroop color-word interference in older and younger adults. Both experiments employed a computerized, single-item version of the Stroop task with a voice response, and both involved practice over hundreds of trials. Both experiments showed generally similar practice patterns, including a practice-related reduction in the size of the color-word interference effect. However, the older group continued to show a larger interference effect throughout practice. These findings indicate that older adults show the same trend in practice-related improvement on the Stroop task as younger adults.     

Anger at unfairness: is it moral outrage?

Anger at unfair treatment has been called moral outrage. However, moral outrage—anger at the violation of a moral standard—should be distinguished from personal anger at being harmed and empathic anger at seeing another for whom one cares harmed. Across a preliminary experiment and a main experiment, both designed to manipulate the appraisal conditions for these three forms of anger, we found evidence of personal anger and empathic anger, but little evidence of moral outrage. Participants perceived unfair treatment of another, even another for whom they had not been induced to feel empathy, to be as unfair as participants perceived unfair treatment of themselves. But the appraisal conditions that evoked anger were unfair treatment of self and unfair treatment of a cared-for other, not unfairness per se. In the absence of empathic concern, unfair treatment of another evoked little anger. Possible implications for understanding moral emotion and moral motivation are suggested. Copyright © 2007 John Wiley & Sons, Ltd.     

A geometrical analysis of the unfolding model: General solutions

Given the complete setR of rank orders obtained from any configuration ofn stimulus points inr dimensions in accordance with the unfolding model, a configuration from which just these orders may be derived will be described as a solution forR. The space is assumed to be Euclidean. Necessary and sufficient conditions are derived for a configuration to be a solution forR. The geometrical constraints which are necessary and sufficient to determine the subset of pairs of orders and opposites contained inR are also identified and constitute the constraint system for the ordinal vector model. The relationship between the two models is discussed.