Biomedical subjects

Raffaella Tancredi

Publications and source records attributed to Raffaella Tancredi.

3 recordsLinked to original sources

PubMed2005

Spatial and motion integration in children with autism.

Neuropsychological and psychophysical studies report controversial results regarding local-global visual processing and motion perception in autism. Here, we investigate contour integration and motion perception in an accurately diagnosed sample of autistic children, using low-level psychophysical tasks. We measured detection thresholds for a closed chain of Gabor patches, for different values of inter-element distance and we measured coherency thresholds of optic flow motion stimuli. Both experiments show comparable performances between autistics and normal subjects, demonstrating no evidence of early perceptual integration deficits. Some improvement in performance with age is detected in both groups.

Adolescent↗

PubMed2005

Possible association between autism and variants in the brain-expressed tryptophan hydroxylase gene (TPH2).

We report a possible association between autism in our sample and a recently described brain-expressed tryptophan hydroxylase gene (TPH2). The well-replicated involvement of the serotonin neurotransmitter system in autism has stimulated interest in many genes in the serotonin pathway as possible candidates for mutations leading to autism susceptibility. Serotonin synthesis is controlled by the rate-limiting enzyme tryptophan hydroxylase. A mouse study of the original tryptophan hydroxylase gene (TPH1) and the new isoform (TPH2) showed that while TPH1 is primarily expressed peripherally, TPH2 is found exclusively in brain tissue. We searched for human sequence variants in 6,467 nucleotides covering all 11 exons of TPH2, and also 248 nucleotides upstream of the start codon, and 935 nucleotides downstream of the stop codon. Eighteen variants were characterized in 88 subjects with autism studied at our two centers, and 95 unrelated control subjects. Using a model-free association method and empirical P value estimation, two variants showed frequency differences between autism and control subjects (P = 0.01 for a T-G variant in intron 1, and P = 0.02 for a A-T variant in intron 4). A haplotype including these variants showed slightly increased significance (P = 0.005). Further investigation of clinical phenotypes showed a possible association between presence of the variants at these two SNPs and higher scores on the Autism Diagnostic Interview (ADI) domain describing repetitive and stereotyped behaviors (P = 0.007). We conclude that TPH2 may play a modest role in autism susceptibility, perhaps relating specifically to repetitive behaviors, pending replication of this result.

Autistic Disorder↗

PubMedDate not supplied

Efficacy of brief dynamic psychotherapy for children with emotional disorders.

BACKGROUND: Child psychiatry has enjoyed a long tradition of using brief psychotherapy with children, but research on its efficacy and effectiveness in the setting of routine clinical care is remarkably sparse; the aim of this study was to evaluate the efficacy of an original model of brief psychodynamic psychotherapy (BPP) for children with emotional disorders in a clinical outpatient setting. METHODS: A sample of 30 subjects (6.3-10.9 years old) was divided into an experimental BPP group and a control group. Each subject was evaluated at the beginning, after 6 months and at an 18-months follow-up. Outcome measures were Children's Global Assessment Scale and Child Behavior Check-List. Statistical and clinical significance of change were evaluated. RESULTS: At the first evaluation, the experimental group showed a better improvement in global functioning; at follow-up, the two groups improved to a comparable degree, but only the mean of the experimental group moved to a functional range. The experimental group showed a significant reduction in total behavioral problems and externalizing problems at the follow-up. CONCLUSIONS: The better improvement of the experimental group in two outcome measures suggests that BPP is efficient in emotional disorders. The hypothesis that BPP introduces changes at long term (sleeper effects) is suggested. The improvement in global functioning of the two groups is discussed in relation to specific characteristics of emotional disorders. Finally, limitations of the study are discussed and in particular the bias introduced by lack of randomization.

Affective Symptoms↗