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At least 829 records · Page 46Linked to original sources
PubMed1995

Activity recognition in long-term electromyograms.

Long-term electromyography with portable recorders allows the study of muscle activity in the natural environment to investigate whether muscle overuse or oral habits may contribute to initiate or perpetuate a myoarthropathy of the masticatory system. At present, little is known about the behaviour of masticatory muscles over long time periods. The aim of this preliminary study was to define parameters which allow the automatic recognition of different types of oral activities from the electromyogram form. A programme with functional and parafunctional activities was performed by four volunteers (total of 333 functional and 82 parafunctional recordings). Electromyograms of the masseter and temporal muscles were recorded by means of a self-developed portable intelligent solid state recorder. Signal mean level (mw) and dynamics (dw) within a sliding window were determined. Temporal muscle recordings allowed better discrimination between function and simulated parafunction. The average of mw for clenching was 51.4 +/- 3.5% and for tooth grinding 21.2 +/- 2% of the peak electromyogram value at maximum voluntary clench. At 0.96 s sliding window duration, clenching, tooth grinding and chewing signals had maximum separation, using dw/mw as parameters (average: 0.16 +/- 0.01 for clenching, 0.39 +/- 0.01 for teeth grinding and 0.88 +/- 0.01 for chewing).

Adult↗
PubMed1996

Listener and context dependency in the perception of emotional aspects of infant voice.

Developmental aspects of an infant's ability to express emotions through vocalizations were studied based on perceptual rating experiments against 12 vocalization- and emotion-related reference words. Three groups of listeners, students, mothers with infants, and nursery governesses, rated 28 voice samples recorded from a male infant at 6, 9, 12 and 17 months of age, under a positive or negative context. Among three factors extracted by a factor analysis, one representing the emotional contrast of frightened/angry versus happy was found to be independent of listener group, infant age and context. The other two, one representing contrast between pleased/happy versus demanding/sad and the other seeking affection and rejecting/angry were dependent on infant age and context. These results may indicate that infants even at 6 months of age can express the emotional contrast of 'pleasure' versus 'discomfort' through vocalization, which listeners perceive independently in context.

Anger↗
PubMed1992

An observational study of the affective concomitants of mastery in infants.

The hypothesis that attempts at motor mastery were accompanied by positive affective responses was tested in an observational study of 9-11-month old infants in a daycare setting. Five infants were observed as they attempted three age-appropriate motor tasks--pulling to stand, standing with support, and taking steps with support. Positive affective responses included smiling, babbling, and laughing. The five infants were observed for a total of 82 hours. The proportion of positive affective behaviors associated with practicing new motor tasks was compared to the proportion associated with well-practiced tasks. The hypothesis that more positive affective behaviors would be associated with attempts at mastering the new motor tasks was confirmed. There was no diminution in the association between the new motor tasks and positive affect as the infants continued to practice and master the three motor tasks. The results are discussed in terms of individual differences in mastery motivation and the often suggested continuity between early mastery motivation and later competencies.

Child↗
PubMed1981

Behavioral correlates in the happy puppet syndrome: a characteristic profile?

Nine children with the "happy puppet" syndrome are presented here and 19 previously reported cases are reviewed. A characteristic psychological profile is suggested by the children's "unfocused" activities and inconsistent responsiveness to their surroundings. Behavioral characteristics are atypical for mental age and do not appear to represent unusual seizure equivalents. Recognition of such non-adaptive behavior may be of importance in selecting specific treatment and management techniques to modify the characteristics of this syndrome at an early age.

Child Behavior Disorders↗
PubMed1984

Gelastic epilepsy and true precocious puberty due to hypothalamic hamartoma.

A new case of gelastic epilepsy and precocious puberty due to hypothalamic hamartoma is reported. After long-term medical treatment there was no observable neurological or endocrinological improvement and the clinical outcome was poor. The authors consider that early surgery for hamartoma should be reconsidered.

Diseases in Twins↗
PubMed1997

Widespread cerebral structural changes in two patients with gelastic seizures and hypothalamic hamartomata.

PURPOSE: We tested the hypothesis that widespread extralesional abnormalities of cerebral structure exist in association with apparently isolated hypothalamic hamartomata, providing a structural basis for the poor response of seizures to removal of the hamartoma or other apparently focal epileptogenic zones present. METHODS: High-resolution magnetic resonance imaging (MRI) brain scans of 2 patients with hypothalamic hamartomata were quantified by determination of regional distribution and symmetry of distribution of cortical gray matter and subcortical matter volumes. The results were compared with normal ranges for the distribution of such tissues in 33 controls. RESULTS: Both patients had abnormalities of distribution of gray and subcortical matter, whereas control subjects did not. These abnormalities were beyond the hamartoma itself, in areas of cerebrum that on visual inspection alone appeared completely normal. CONCLUSIONS: Extralesional abnormalities of cerebral structure are present in the cerebrum of patients with hypothalamic hamartoma, as in most patients with other dysgeneses. These abnormalities may explain the poor outcome of epilepsy surgery in patients with this form of dysgenesis. These preliminary findings require further investigation.

Adult↗
PubMed1999

Gelastic epilepsy: symptomatic and cryptogenic cases.

PURPOSE: To describe the etiology, characteristics, and clinical evolution of epilepsy in patients with gelastic seizures (GSs). METHODS: Nine patients whose seizures were characterized by typical laughing attacks were observed between 1986 and 1997. Patients were selected based on electroencephalogram (EEG) or video-EEG recordings of at least one GS and on magnetic resonance imaging (MRI) study. RESULTS: Five patients were affected by symptomatic localization-related epilepsy (LRE), with four of the patients' disorders related to a hypothalamic hamartoma (HH) and one to tuberous sclerosis (TS) without evident hypothalamic lesions. In four patients (the cryptogenic cases) MRI was negative also in these cases, clinical and EEG data suggested a focal origin of the seizures. The epileptic syndrome in the HH cases was usually drug-resistant, and was surgically treated in two of the patients. The patient with TS became seizure free with vigabatrin. In the cryptogenic cases, the ictal, clinical, and EEG semiology were similar to the symptomatic cases: the clinical evolution was variable, with patients having transient drug resistance or partial response to treatment. No cognitive defects were observed in the cryptogenic patients. None of the nine patients had precocious puberty. CONCLUSIONS: We confirm the frequent finding of HHs in GSs and further underline how GSs may also be observed in patients without MRI lesions and with normal neurologic status. In these patients, clinical and EEG seizure semiology is similar to symptomatic cases, but the clinical evolution is usually more benign.

Adult↗