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At least 631 records · Page 35Linked to original sources
PubMed1985

Attributed strings for recognition of epileptic transients in EEG.

This paper presents a structural pattern recognition system for signals interpreted and described by a human expert. For each pattern to be recognized, the signal is represented by a sequence of local information ('types of primitives') which is syntactically correct if some 'structural attributes' are satisfied. Types of primitives and structural attributes are defined. This representation method takes a priori knowledge of the expert's descriptions into account. Our system is concerned with EEG's analysis. Detection of transient events, spikes and spike-and-wave complexes helps the electroencephalographist by rejecting parts of the EEG trace which certainly do not contain these patterns. The transient events detection keeps a 16% average of the initial trace for pathological EEG's and 8.3% for non-pathological EEG's. Only 3.3% of pathological EEG's are not rejected after spikes and spike-and-wave complexes detection. The results of this parse are compared with human interpretations.

Biometry↗
PubMed1991

Perception of visual letter strings in a case of left neglect: manipulation of the word form.

Patients with lesions in the right parietal lobe neglect the left side of nonwords much more than the left side of words. This has been interpreted in terms of a more automatic process in reading words. The case of a patient with left visual neglect after a vascular right parietooccipital lesion is presented. He showed the phenomenon of a word superiority effect over nonword in reading at the beginning in a clinical test with static cards; 6 months later, after some recovery, the same phenomenon could be demonstrated only with tachistoscopic presentation, and it occurred even inside the good right visual hemifield. The word form of visually presented stimuli was manipulated, showing that there was a striking effect particularly when spacing the letters of words in a task that requires naming the stimulus. The patient's performance is interpreted in terms of an attentional deficit occurring at an early level of spatial information processing.

Attention↗
PubMedDate not supplied

Theme and variations on a string of amyloid.

In vivo amyloidogenesis seems to involve glycosaminoglycans. The latter may be especially important in their interactions with amyloid precursors. Glycosaminoglycans may influence both the folding of and amyloid precursors. Glycosaminoglycans may influence both the folding of and proteolytic attack on such precursors, and one may speculate that proteolysis is an after-event in amyloid fibril formation.

Alzheimer Disease↗
PubMed1994

Choice of moving target for a string phantom: I. Measurement of filament backscatter characteristics.

Detected back-scattered Doppler signal level was measured from the following filaments: braided silk filaments, nylon and O-ring rubber. The detected signal level fell with time from the point of immersion by 45-85% for the silk filaments and by 50% for the nylon, but did not change for the O-ring rubber. For all of the silk filaments there were strong backscatter peaks at Doppler angles varying from 55-80 degrees for a transmit frequency of 4 MHz. Nylon demonstrated a large peak at 90 degrees, whereas there was no large backscatter peak present for O-ring rubber. The paper concludes that the use of braided filaments for the assessment of the accuracy of Doppler estimated velocity may lead to errors if the angular backscattered peak is very strong. O-ring rubber may be suitable for the testing of Doppler-estimated velocity.

Models, Structural↗