The association of sleep disturbances with endocrine and perceived stress reactivity measures in male employees

Evidence on the relationship between stress reactivity and sleep is conflicting. This study examined the association between disturbed sleep and perceived and endocrine stress reactivity independently of age, body mass index (BMI), and chronic stress. One hundred and twenty middle-aged men were exposed to the Trier Social Stress Test for Groups. The Pittsburgh Sleep Quality Index and the Perceived Stress Reactivity Scale were used to assess sleep and perceived stress reactivity, respectively. Endocrine stress reactivity was examined by assessing salivary cortisol levels. Regression analyses showed that men with disturbed sleep had blunted overall cortisol responses (b = −18.246, p = .044), but the association did not survive adjustment for age, BMI, and chronic stress. In contrast, poor sleep was associated with heightened perceived stress reactivity independently of age and BMI (b = 0.235, p = .005), but additional adjustment for chronic stress attenuated the relationship and only chronic stress remained a significant predictor of perceived stress reactivity (b = 0.470, p < .001). Cortisol and perceived stress reactivity were uncorrelated. In summary, our study indicates associations between sleep disturbances and stress reactivity were not independent of BMI and chronic stress levels, and endocrine and perceived stress reactivity were dissociated.     

How task experience influences students' performance expectancies: the role of certainty

The importance of performance expectancies for predicting behavior has long been highlighted in research on expectancy-value models. These models do not take into account that expectancies may vary in terms of their certainty. The study tested the following predictions: task experience leads to a higher certainty of expectancies; certainty and mean expectancies are empirically distinguishable; and expectancies held with high certainty are more accurate for predicting performance. 273 Grade 8 students reported their performance expectancy and the certainty of expectation with regard to a mathematics examination immediately before and after the examination. Actual grades on the examination were also assessed. The results supported the predictions: there was an increase in certainty between the two times of measurement; expectancies and certainty were unrelated at both times of measurement; and for students initially reporting higher certainty, the accuracy of the performance expectancy (i.e., the relation between expectancy and performance) was higher than for students reporting lower certainty. Given lower certainty, the accuracy increased after the students had experience with the examination. The data indicate that it may be useful to include certainty as an additional variable in expectancy-value models.     

Need for Cognition and the process of lie detection

Four experiments investigated the influence of Need for Cognition on the process of lie detection. According to the basic assumptions of dual process models, only higher Need for Cognition leads to the use of verbal information when making judgments of veracity. People with lower Need for Cognition predominantly use stereotypical nonverbal information for their judgments. In both Experiments 1 and 2, participants saw a film in which nonverbal cues (fidgety vs. calm movements) and verbal cues (low vs. high plausibility) were manipulated. As predicted, when Need for Cognition was lower, only the nonverbal cues influenced participants' judgments of veracity. In contrast, participants with higher Need for Cognition also used the verbal cues. Experiments 3 and 4 tested the hypothesis that higher Need for Cognition leads to better discrimination of truthful from deceptive messages. Both experiments found that participants with higher Need for Cognition achieved higher accuracy at classifying truthful and deceptive messages than participants with lower Need for Cognition.     

Potential negative consequences of mindfulness in the moral domain

Mindfulness is a state of paying conscious and nonjudgmental attention to present-moment experiences. Previous research relates this state to more effective emotion regulation and less emotion reactivity. We therefore hypothesized an attenuating effect of a mindfulness exercise on moral reactions that usually results from a bad conscience when having caused harm. Across five studies, we experimentally induced mindfulness via a short breathing exercise and then assessed harm-based moral reactions. As hypothesized, participants in the mindfulness (vs. control) exercise condition showed (i) attenuated repair intentions after having read a scenario in which participants caused harm to a friend (Study 3) and (ii) attenuated intentions to change harm-causing eating habits (Study 4). Results of Studies 1, 2 and 5 did not provide evidence for our hypothesis. A following meta-analysis across all five studies yielded an overall significant effect of mindfulness in the harm-condition, providing preliminary evidence for a potential downside to mindfulness.     

The attenuating effect of mortality salience on dishonest behavior

People are easily tempted to engage in dishonest behavior when an incentive is given and when full anonymity is provided. In the present work, we investigated existential threat as a motivational factor that might reduce dishonest behavior. Research based on terror management theory has found that mortality salience increases the motivation to fulfill salient values of one’s cultural worldview. Assuming the concept of honesty is important to human societies, we hypothesized that mortality salience will reduce dishonest behavior when the concept of honesty is salient. In two experiments, we assessed dishonesty under full anonymity by applying a die-under-the-cup paradigm with the expected value serving as a stochastic baseline for honest behavior. Both experiments provided support for our hypothesis. Given an incentive to cheat, when the concept of honesty was cognitively activated by a word-search puzzle (Study 1) or by the name of the dice game (i.e., “honest game”; Study 2), mortality salient participants showed not only less dishonest behavior but actually honest behavior.

     

An ordinal evaluation of categorical judgement data by random utilities and a corresponding correlation analysis

Categorical judgement data are analyzed along the lines of random utility theory. A class of orders is introduced (categorical weak orders); their characteristic vectors are regarded as points in a Euclidean space; their convex hull forms a polytope whose facets are fully characterized. This polytope is shown to correspond to an order polytope. Furthermore, its relation to the biorder polytope is pointed out. The convex representations of a given point of the polytope are discussed. The impact of these results on the methods of analyzing data arising from a categorical judgement procedure is outlined. In particular, some consequences are drawn with respect to the usual evaluation of correlations of such data.     

The Normal Distribution Derived from Qualitative Conditions

The normal distribution is characterized in a measurement theoretic framework. The qualitative conditions guarantee that representations can be regarded as random variables. Additional axioms, also qualitative in the measurement sense, yield the normal. One characterization draws on a limit theorem. The main result derives the normal distribution from conjoint measurement axioms. This approach consists of formulating properties of a linear model as a component structure with error as one component. The normal distribution of errors is shown to be a consequence of the measurement theoretic assumptions. The possible impact of these results on statistical models is discussed. Copyright 2001 Academic Press.     

Cortical auditory disorders: a case of non-verbal disturbances assessed with event-related brain potentials

In the auditory modality, there has been a considerable debate about some aspects of cortical disorders, especially about auditory forms of agnosia. Agnosia refers to an impaired comprehension of sensory information in the absence of deficits in primary sensory processes. In the non-verbal domain, sound agnosia and amusia have been reported but are frequently accompanied by language deficits whereas pure deficits are rare. Absolute pitch and musicians' musical abilities have been associated with left hemispheric functions. We report the case of a right handed sound engineer with the absolute pitch who developed sound agnosia and amusia in the absence of verbal deficits after a right perisylvian stroke. His disabilities were assessed with the Seashore Test of Musical Functions, the tests of Wertheim and Botez (Wertheim and Botez, Brain 84, 1961, 19-30) and by event-related potentials (ERP) recorded in a modified 'oddball paradigm'. Auditory ERP revealed a dissociation between the amplitudes of the P3a and P3b subcomponents with the P3b being reduced in amplitude while the P3a was undisturbed. This is interpreted as reflecting disturbances in target detection processes as indexed by the P3b. The findings that contradict some aspects of current knowledge about left/right hemispheric specialization in musical processing are discussed and related to the literature concerning cortical auditory disorders.