Browsing by Author "Freitas, Diamantino"
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- Brain's electrical response to visual and auditory stimuli. relations between the two stimuli modalitiesPublication . Giesteira, Bruno; Travassos, João; Freitas, Diamantino; Tavares, DianaAscertain relations between brain responses elicited by stimuli of different modalities (visual and audiological). The stimuli used were based on some of the basic elements and concepts of the visual syntax, regarding to the Gestalt theory, and an audiological grammar based on the clinical protocols. We used Event-Related Potentials for assessing the brain's electrical response to visual and auditory stimuli. Materials: Biopac Systems Mp 150 - Data acquisition unit “MP150A.CE”; universal interface module “UIM100C”; stimulator module “STM100C”, two electroencephalogram amplifier modules “EEG100C”; Ag-AgCL lead electrodes - AcqKnowledge 3.9.0 (software); SuperLab 4.0 (software) and MatlabR2008B. Interim results presented in form of waveforms representing the average and standard deviation of all signals acquired for each type of stimulus. We can visually conclude that different modalities elicit different waveforms and certain stimuli have a more defined response than others.
- Voice parameters in children with Down syndromePublication . Moura, Carla Pinto; Cunha, Luís Miguel; Vilarinho, Helena; Cunha, Maria João; Freitas, Diamantino; Palha, Miguel; Pueschel, Siegfried M.; Pais-Clemente, M.; Gonçalves, Maria João MoreiraDown syndrome (DS) is the most frequent chromosomal disorder. Commonly, individuals with DS have difficulties with speech and show an unusual quality in the voice. Their phenotypic characteristics include general hypotonia and maxillary hypoplasia with relative macroglossia, and these contribute to particular acoustic alterations. Subjective perceptual and acoustic assessments of the voice (Praat-4.1 software) were performed in 66 children with DS, 36 boys and 30 girls, aged 3 to 8 years. These data were compared with those of an age-matched group of children from the general population. Perceptual evaluations showed significant differences in the group of children with DS. The voice of children with DS presented a lower fundamental frequency (F0) with elevated dispersion. The conjunction of frequencies for formants (F1 and F2) revealed a decreased distinction between the vowels, reflecting the loss of articulatory processing. The DS vocalic anatomical functional ratio represents the main distinctive parameter between the two groups studied, and it may be useful in conducting assessments.