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Susanne Walitza

Publications and source records attributed to Susanne Walitza.

9 recordsLinked to original sources
PubMed2006

Attention and movement execution during handwriting.

Two studies were performed in order to test the hypothesis that movement execution during handwriting in skilled writers is independent of attention. Study I examined the relationship between attentional functioning and kinematic aspects of handwriting movements in 24 adult participants. A digitizing tablet was used for the assessment of handwriting movements. Participants were asked to perform a simple writing task and various components of their attention were assessed. Correlation analysis indicated no significant relationship between attention functions and both kinematic aspects of handwriting movements and quality of handwriting. In Study II, 20 participants underwent total sleep deprivation (TSD) for 24h. While attention, as assessed with alertness and vigilance tasks, deteriorated during TSD, the execution of handwriting movements, as assessed with a digitizing tablet, improved markedly. The quality of handwriting was not affected by TSD. These findings may suggest an independence between attention and movement generation during handwriting.

Adult↗
PubMed2006

The effect of caffeine on handwriting movements in skilled writers.

In laboratory tasks, caffeine has been shown to improve psychomotor performance. The aim of the present experiment was to assess the effects of caffeine on a skilled everyday life task in habitual caffeine consumers. The assessment of handwriting movements of 20 adults was performed following the administration of 0mg/kg (placebo), 1.5mg/kg, 3.0mg/kg or 4.5mg/kg of caffeine. A digitising tablet was used for the assessment of fine motor movements. Participants were asked to perform a simple writing task. Kinematic analysis of handwriting movements showed that, in comparison to placebo administration, high doses of caffeine (i.e., 4.5mg/kg) can produce improvements in handwriting as indicated by more fluent handwriting movements as well as an increase in maximum velocity and maximum positive and negative accelerations. The results suggest that higher doses of caffeine can enhance psychomotor performance.

Adult↗
PubMed2006

Brain dopamine and kinematics of graphomotor functions.

Three experiments were performed in an attempt to achieve a better understanding of the effect of dopamine on handwriting. In the first experiment, kinematic aspects of handwriting movements were compared between healthy participants and patients with Parkinson's disease (PD) on their usual dopaminergic treatment and following withdrawal of dopaminergic medication. In the second experiment, the writing performance of healthy participants with a hyperechogenicity of the substantia nigra as detected by transcranial sonography (TCS) was compared with the performance of healthy participants with low echogenicity of the substantia nigra. The third experiment examined the effect of central dopamine reduction on kinematic aspects of handwriting movements in healthy adults using acute phenylalanine and tyrosine depletion (APTD). A digitising tablet was used for the assessment of handwriting movements. Participants were asked to perform a simple writing task. Movement time, distance, velocity, acceleration and measures of fluency of handwriting movements were measured. The kinematic analysis of handwriting movements revealed that alterations of central dopaminergic neurotransmission adversely affect movement execution during handwriting. In comparison to the automatic processing of handwriting movements displayed by control participants, participants with an altered dopaminergic neurotransmission shifted from an automatic to a controlled processing of movement execution. Central dopamine appears to be of particular importance with regard to the automatic execution of well-learned movements.

Adult↗
PubMed2006

Effects of methylphenidate on multiple components of attention in children with attention deficit hyperactivity disorder.

RATIONALE: Methylphenidate (MPH) has been shown to be effective in the treatment of attention deficits in children with attention deficit hyperactivity disorder (ADHD). Although a variety of studies have been performed, there is little available information as to which components of attentional functioning are disturbed in ADHD. OBJECTIVES: The aim of the present study was to monitor the effect of MPH on various measures of attention in children with ADHD. METHODS: In a double-blind, placebo-controlled, crossover study, the attentional functioning of 58 children diagnosed with ADHD without psychiatric comorbidity was examined. Assessment of attention was performed on their usual MPH treatment and following withdrawal of the drug. Furthermore, the attentional performance of 58 healthy children was assessed. The test battery consisted of reaction time tasks, including measures of alertness, vigilance, divided attention, flexibility, and aspects of selective attention such as focused attention, inhibition, and integration of sensory information. RESULTS: In comparison to the test performance of healthy children, children with ADHD displayed impairments of vigilance, divided attention, flexibility, and aspects of selective attention including focused attention, inhibition, and integration of sensory information. Statistical comparison of attentional functioning of children with ADHD on and off MPH treatment revealed that the medication resulted in an improved task accuracy regarding vigilance, divided attention, inhibition, focused attention, integration of sensory information, and flexibility. CONCLUSION: The present findings indicate that various aspects of attention are markedly impaired in children with ADHD. Treatment with MPH was accompanied by improvements in attention functions of small to moderate sizes. Although MPH-induced improvements were observed in a broad range of attention measures, children with ADHD who were on MPH treatment nevertheless displayed serious deficits in a number of components of attention.

Attention↗
PubMed2006

The extent of social anxiety in combination with mental disorders.

The aim of the study was to investigate the extent of social anxiety in different mental disorders. A total of 341 patients aged 7-18 years participated in the study. To measure social anxiety, the German version (SPAIK) of the Social Phobia and Anxiety Inventory for Children (SPAI-C) was used. Subgroups were built dependent on mental disorders. A total score above 20, which was assumed to indicate social anxiety, was observed in children with selective mutism (n = 9; M = 22.68; SD = 11.29) and in children with Asperger's Syndrome (n = 7; M = 20.77; SD = 13.77). Patients who had the following mental disorders also showed a higher total score of social anxiety: obsessive-compulsive disorder, anorexia nervosa, schizophrenia, depression and conduct disorder. In none of these disorders, however, did the mean total score exceed the cut-off of 20.

Adolescent↗
PubMed2006

[Severe early-childhood obsessive-compulsive disorder--case report on a 4-year-old girl].

OBJECTIVES: OCD is seldom diagnosed in children younger than six years of age. The present report deals with the diagnosis and therapy of OCD at a very early onset in childhood. METHODS: Reported is the case of a 4-year-old girl who was affected by severe compulsive behaviour, with marked impairment of her familial and extra-domestic social activities, including an inability to attend kindergarten. RESULTS: The girl was affected to an extreme extent by compulsive symptoms pertaining to symmetry and order, and suffered from severe psychological strain. Her symptoms improved markedly following behaviour therapy in an inpatient setting. Adjuvant medication was not necessary. Her parents were counselled intensively and included in the therapeutic process. She was able to return to her family, resuming activities appropriate for a child her age, and to attend kindergarten. CONCLUSIONS: OCD can develop in a child as early as at the age of four. For diagnostic procedure in cases of "very early onset", OCD criteria described by ICD-10 and DSM-IV can be applied. Behaviour therapy was effective even in this case of early manifestation of OCD. Particularly important is the inclusion of the parents in the therapeutic process.

Behavior Therapy↗
PubMed2005

Transmission disequilibrium of polymorphic variants in the tryptophan hydroxylase-2 gene in children and adolescents with obsessive-compulsive disorder.

Dysfunction of the central serotonergic system has been implicated in the pathophysiology of obsessive-compulsive disorder (OCD). The genetic contribution to the development of OCD is particularly high in early-onset OCD. The aim of this study was to investigate the effect of polymorphic variants in the gene of the novel brain-specific tryptophan hydroxylase-2 (TPH2), the rate-limiting enzyme of serotonin (5-HT) synthesis in the brain, in OCD with disease onset in childhood and adolescence. We analysed two common single nucleotide polymorphisms (SNPs) of TPH2 in the putative transcriptional control region and in intron 2 of the TPH2 gene in a unique family-based sample of OCD patients with onset of the disease in childhood and adolescence comprising 71 complete, independent trios. The transmission disequilibrium test was used to determine transmission of alleles and haplotypes from parents to offspring. In this first study of TPH2 in OCD, analysis of the SNPs, rs4570625 and rs4565946, revealed a significant preferential transmission of haplotype G-C to children and adolescents with OCD. Moreover, a trend towards preferential transmission of the C allele of SNP rs4565946 to the patients was found. The genotype relative-risk estimate for homozygous C allele carriers of SNP rs4565946 was 2.58 (95% CI 0.98-6.82). In conclusion, the results link TPH2 variations to the pathogenesis of early-onset OCD and further support the aetiological relevance of 5-HT signalling in OCD.

Adolescent↗
PubMed2005

[Validation of the German version of the Australian Scale of Asperger's Syndrome (ASAS)].

OBJECTIVES: The aim of the study was to validate the German version of the Australian Scale for Asperger's Syndrome (ASAS). Furthermore, the scoring of the ASAS as applied by the Australian authors was verified. METHODS: The mothers of 18 children with Asperger's Syndrome, those of 18 children referred for a possible diagnosis of Asperger's Syndrome, but who did not receive that diagnosis, and the mothers of 15 children with other mental disorders participated in the study. All of the children were inpatients at the University of Wuerzburg Hospital of Child and Adolescent Psychiatry. RESULTS: According to an analysis of variance, the scale successfully differentiates among the three samples. A stepwise discriminant analysis was performed. Classification results show that the membership of the three groups could be labelled accurately (accuracy rate: 60.78%). The ASAS's scoring methodology appears to yield good results for German patients. CONCLUSIONS: The scale appears to be an adequate tool for screening purposes in that it correctly discriminates children and adolescents with Asperger's Syndrome.

Adolescent↗