The Undepleted Ego: Self-Regulatory Adaptation in Multiple Task Sequences

Working on a task that requires strong self-regulation can deteriorate performance in a subsequent task also involving high self-regulatory demands. Several studies suggest that the consumption of limited self-regulatory resources may account for this effect known as ego depletion. We investigated the influence of expectations about upcoming tasks on self-regulatory performance in two experiments, contrasting tasks with high and low self-regulatory demand. We manipulated expectations by informing participants about the number of tasks to be worked on (Experiment 1) and by varying the number of tasks (Experiment 2). With the expectation of highly demanding tasks no ego-depletion effect occurred. Results show that expecting a continuation of high self-regulatory demand in a sequence of several tasks actually improved performance.     

Observing repetitive finger movements modulates response times of auditorily cued finger movements

Our motor and perceptual representations of actions seem to be intimately linked and the human mirror neuron system (MNS) has been proposed as the mediator. In two experiments, we presented biological or non-biological movement stimuli that were either congruent or incongruent to a required response prompted by a tone. When the tone occurred with the onset of the last movement in a series, i.e., it was perceived during the movement presentation, congruent biological stimuli resulted in faster reaction times than congruent non-biological stimuli. The opposite was observed for incongruent stimuli. When the tone was presented after visual movement stimulation, however, no such interaction was present. This implies that biological movement stimuli only affect motor behaviour during visual processing but not thereafter. These data suggest that the MNS is an "online" system; longstanding repetitive visual stimulation (Experiment 1) has no benefit in comparison to only one or two repetitions (Experiment 2).     

Names Introduced with the Help of Unsatisfied Sortal Predicates: Reply to Aranyosi

In this paper I answer Aranyosi’s (Axiomathes 19(2):223–224, 2009) criticism of my “Is Phosphorus Hesperus?” (Axiomathes 19(1):101–102, 2009).     

Cognitive reactivity mediates the relationship between neuroticism and depression

Although neuroticism has long been established as an important risk factor for depression, the mechanisms through which this temperamental predisposition translates into the occurrence of symptoms are still relatively unclear. This study investigated cognitive reactivity, i.e. the ease with which particular patterns of negative thinking are reactivated in response to mild low mood, as a potential mediator. Individuals with (N = 98) and without a previous history of depression (N = 83) who had provided neuroticism scores six years previously were assessed for cognitive reactivity and current symptoms of depression using self-report questionnaires. Tendencies to respond to mild low mood with ruminative thinking mediated the relation between neuroticism and current symptoms of depression in both groups. Reactivation of hopelessness and suicidal thinking occurred as an additional mediator only in those with a history of previous depression. The results suggest that neuroticism predisposes individuals to depression by generally increasing the likelihood of ruminative responses to low mood. In those with a history of depression in the past, neuroticism additionally increases risk of recurrence by facilitating reactivation of previously associated patterns such as suicidal thinking and hopelessness. These findings suggest potential targets for interventions to help preventing the occurrence, or recurrence of depression in those who due to their temperamental predisposition are at an increased risk.     

Impaired visual perception of hurtful actions in patients with chronic low back pain

Visually presented biological motion stimuli activate regions in the brain that are also related to musculo-skeletal pain. We therefore hypothesized that chronic pain impairs the perception of visually presented actions that involve body parts that hurt. In the first experiment, chronic back pain (CLBP) patients and healthy controls judged the lifted weight from point-light biological motion displays. An actor either lifted an invisible container (5, 10, or 15 kg) from the floor, or lifted and manipulated it from the right to the left. The latter involved twisting of the lower back and would be very painful for CLBP patients. All participants recognized the displayed actions, but CLBP patients were impaired in judging the difference in handled weights, especially for the trunk rotation. The second experiment involved discrimination between forward and backward walking. Here the patients were just as good as the controls, showing that the main result of the first experiment was indeed specific to the sensory aspects of the task, and not to general impairments or attentional deficits. The results thus indicate that the judgment of sensorimotor aspects of a visually displayed movement is specifically affected by chronic low back pain.     

Text Belief Consistency Effects in the Comprehension of Multiple Texts With Conflicting Information

When reading multiple texts about controversial scientific issues, learners must construct a coherent mental representation of the issue based on conflicting information that can be more or less belief-consistent. The present experiment investigated the effects of text–belief consistency on the situation model and memory for text. Students read four texts about a scientific controversy. Learners' situation model was biased towards their beliefs when belief-consistent and belief-inconsistent texts were presented block-by-block. When the texts were presented alternatingly, situation models for belief-consistent and belief-inconsistent texts were equally strong. Moreover, the text base was better for belief-inconsistent texts. These results support the idea that prior beliefs influence the processing of conflicting information in multiple texts differently on the level of the situation model and on the propositional text base. A more balanced situation model of scientific controversies can be promoted by presenting belief-consistent and belief-inconsistent texts in an alternating sequence.