Anarchic-hand syndrome: ERP reflections of lost control over the right hemisphere

In patients with the callosal type of anarchic-hand syndrome, the left hand often does not act as intended and counteracts the right hand. Reports are scarce about the underlying neurophysiological mechanisms. We report the case G.H. who developed the syndrome after infarction of the left arteria pericallosa. It has been suggested that the syndrome arises out of lacking inhibition from the dominant left hemisphere on the right hemisphere. Yet, in tests of spatial intelligence G.H. performed much better with his “anarchic” left hand than with his dominant right hand, similar to observations commonly reported in split-brain patients. Left-right manual choice responses and event-related EEG potentials to laterally presented stimuli were measured. Asymmetries were evident in G.H.’s behavior and EEG potentials, different from age-matched healthy participants (n = 11). His right-hand responses were fast and unaffected by incompatibility with stimulus location, whereas his left-hand responses were variable and accompanied by a large negative central-midline EEG potential, probably reflecting efforts in initiating the response. G.H.’s visual N1 component peaked earlier and was larger at the right than the left side of the scalp, and the P3 component was distinctly reduced at the right side. Both features occurred independent of side of stimulus presentation and side of responding hand. The effort indicated by the midline negativity and the asymmetrically reduced P3 might directly reflect G.H.’s lack of control on his right hemisphere’s processing. The faster visual processing of the right hemisphere suggested by the N1 asymmetry might contribute to “anarchic” processing, making the right hemisphere process stimuli before control impulses exert their effect. These neurophysiological results tend to support the split-brain account which assumes that the syndrome arises by the lack of communication between hemispheres that act according to their respective competences.     

Bipolare Störung und Bornavirus-Infektion

Borna Disease Virus (BDV) wird seit mehr als 20 Jahren als potenzieller kausaler Co-Faktor insbesondere bei affektiven Erkrankungen diskutiert. Die folgende Kasuistik demonstriert die erste antivirale Behandlung einer BDV-infizierten Patientin mit einer bipolaren affektiven St?rung, die bei sonst therapieresistentem Verlauf mit klassischen Antidepressiva von der Amantadin-Behandlung klinisch sehr profitierte. Die Bedeutung der BDV-Infektion und ihrer Therapie bei affektiven Erkrankungen wird anhand dieser Kasuistik sowie neuerer Studien diskutiert.     

The programming of structural properties of movement sequences

Summary The present paper investigates the role of abstract structural properties in the programming and execution of movement sequences. Three experiments, using converging methods, demonstrate that the motor system represents the abstract structural properties of movement sequences. The first two experiments show that hierarchical structures over a sequence of tapping movements can be used to prepare the motor program, even if the specific elements of the sequence are still unknown. Experiment 2 also shows that the preliminary programming of structural properties of a movement sequence takes more time than the programming of specific elements ( start elements). Experiment 3 suggests that abstract structural properties can be generalized from a special sequence and that they are transferable to other sequences. Abstract structural properties are assumed to be an important component of generalized motor programs.     

Flight into Security: A New Approach and Measure of the Authoritarian Personality

A basic pattern of human response to stressful and uncertain situations which provoke anxiety and insecurity is to seek security and shelter. Those who provide support become by a process of psychological attribution authorities. Therefore the mechanism of seeking support and shelter under strained conditions might be called an "authoritarian reaction." Socialization involves a negotiation with this basic reaction of flight in situations of uncertainty. As individuals develop, they learn to overcome the authoritarian reaction by formulating their own strategies to cope with reality. The authoritarian personality emerges out of an inability to generate such individual coping strategies. Authoritarian personalities defer to the dictates and control of others who offer them the certainty and comfort they cannot provide for themselves. Extensions of this basic authoritarian response are the rejection of the new and the unfamiliar, rigid adherence to norms and value systems, an anxious and inflexible response to new situations, suppressed hostility, and passive aggression. A new measure based on items on one's own behavior, feelings, motivation, and the individual's concept of the self was developed and tested in several empirical studies. It obtained a good reliability and proved to be valid by correlating to measures of right-wing extremism, negative attitudes toward immigrants and women.     

Does a tool eliminate spatial compatibility effects?

Responding to a stimulus is faster and more accurate when stimulus location and response location spatially correspond than when they do not correspond (stimulus–response compatibility). In five experiments this standard compatibility effect is examined when using a T-shaped lever as a tool. Handling the lever allowed distinguishing body-related action effects (e.g., the tactile feedback from the moving finger) from external action effects (e.g., reaching at the stimulus with the lever's end-point). Results showed that the spatial relationship between stimulus and the direction of the hand movement (S-R compatibility) as well as the relationship between the stimulus and the functional end-points of the tool (S-E compatibility) determine performance. More precisely, responses were fast and less error prone when both kinds of compatibility did correspond than when they did not correspond.     

Retracted: Effects of cartoon violence on aggressive thoughts and aggressive behaviors

This article reports on an experiment designed to test whether the cartoon manipulation leads to significant increases in aggressive thoughts and aggressive behaviors among Chinese children (n = 3,000). Results indicated that brief exposure to a violent cartoon triggered higher aggressive thoughts and aggressive behaviors than a nonviolent cartoon. Females displayed higher aggressive thoughts and aggressive behaviors than males in a nonviolent cartoon condition, while males displayed higher aggressive behaviors than females in a violent cartoon condition. Mediation analysis suggested that the effect on aggressive behaviors was mediated by aggressive thoughts. The findings imply that cartoon developers, parents, and teachers should develop cartoons that inhibit children's aggressive thoughts to avoid aggressive behaviors. Females are the key group for the prevention and intervention of aggression in a nonviolent cartoon context, while males are the key group for the prevention and intervention of aggression in a violent cartoon context.