Human Frequency Following Response Correlates of Spatial Release From Masking.

Purpose Speech recognition in complex listening environments is enhanced by the extent of spatial separation between the speech source and background competing sources, an effect known as spatial release from masking (SRM). The aim of this study was to investigate whether the phase-locked neural activity in the central auditory pathways, reflected in the frequency following response (FFR), exhibits SRM. Method Eighteen normal-hearing adults (8 men and 10 women, ranging in age from 20 to 42 years) with no known neurological disorders participated in this study.

Spatial hearing processing: electrophysiological documentation at subcortical and cortical levels.

Recognition of target signal improves when the target and distracted sources are spatially separated, an effect defined as 'spatial release from masking' (SRM). The neural mechanisms underpinning SRM are complicated and still need to be identified. The aim of this study was to identify whether objective correlates of SRM can be recorded in either the brainstem or cortex (or both).

[Biological properties of the mumps virus--behavior in the rct marker].

12 different mumps virus strains or their variations were studied in the rct-marker in dog kidney cell cultures at 32 degree and 39 degree C. The results obtained were compared with those of the T50 marker ascertained earlier revealing considerably coincident data. Changes in culture conditions became clearly evident in both markers.

[Biological properties of the mumps virus. Behavior using the T50 marker].

The authors studied the behaviour of 11 mumps virus strains or variants including the thermolabile standard Jeryl Lynn strain under thermal charge (50 degrees C/30 min). Varants were obtained from the Soviet vaccinal strains Leningrad-3 by cultivation under various conditions. Incubation temperature and cellular substrate played an important role therein.

[Oncogen infectious nucleoprotein and herpes virus hominis type 2 in stages of cervical cancer. Investigatious by indirect immunofluorescens].

Using HVH 2 antisera of rabbit (titre 1:256, dilution 1:10), antologous serum of cervix carcinoma patients (dilution 1:1 to 1:5) and allogenic serum of cervix carcinoma patients without HVH 2 antibodies (dilution 1:1 to 1:5), tumour material obtained from various cancerization stages of cervix carcinoma in 50 cases was incubated following trypsination to single cells with fluoresceine isothiocyanate labelled anti-human globulin and anti-rabbit globulin. Apart from HVH antigens significantly differing in quantity from one stage to the other as detected by immune fluorescence methods, a perinuclear distinct antigen, unrelated to HVH antigens, has also been demonstrated. The last mentioned one might be a specific tumour antigen or an embryonic antigen.