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Biomedical subjects

I G Andreeva

Publications and source records attributed to I G Andreeva.

13 recordsLinked to original sources
PubMed2000

[Auditory analysis of the sound source approaching and withdrawing: psychoacoustic and neurophysiological correlates].

The findings seemed to be based on direction and velocity of modelling the radial sound source shifting in free acoustic field. The threshold and the optimal parameters of the acoustic model imitating the approaching and withdrawing of the sound source shifting in silence and under conditions of noise, were established. A correlation between peak-to-peak amplitudes of the N1-P2 components of auditory EPs and the imitated direction of the sound shifting, was shown. The role of different left and right hemispheres' areas in perception of the radial sound source was analysed. The detector features of the central auditory neurones were shown as a possible mechanism of estimating the sound source approaching and withdrawal.

Acoustic Stimulation↗
PubMed1999

[Modeling the frontal closing and departure of sound source].

Software modeling frontal back and forth movements of a sound allowed determination of the best combinations in which changes in amplitude and frequency of sound pulses sequence invoke distinct sensations of approaching or departing sound factually generated at one and the same spot no matter the distance from the listener.

Acoustic Stimulation↗
PubMedDate not supplied

[The physiotherapeutic correction of secondary immunodeficiency in the preoperative period in patients with rheumatic heart defects].

Directed correction of immunity by physiotherapeutic methods was used at the period of preoperative preparing 45 patients who needed the operation for rheumatic valvular disease of the heart. The number of purulent complications during the postoperative period in the group of patients subjected to direct correction of the immune status was found to be less than in the control group.

Chronic Disease↗
PubMedDate not supplied

[Tendencies in auditory physiology].

Main tendencies in studying of human and animals auditory system with psychoacoustical and electrophysiologycal methods are considered. Concerning psychoacoustical studies some basic data are presented as well as contemporary tendencies in hearing physiology in analysis of the intensity, frequency, temporal characteristics of the sound signals and data related to such phenomena as masking and adaptation. Data concerning directional hearing are presented in detail as a basis of auditory virtual reality. In electrophysiological studies of the auditory system detailed analysis of mapping in auditory centers and mechanisms concerning localization of unmoved and moving auditory stimuli was performed. Special attempt was paid to consider the reflection of different types of auditory signals in human evoked potentials.

Animals↗
PubMedDate not supplied

[The summation properties of the somatosensory system demonstrated via a study of the tactile sensations evoked by an electrical current and by focused ultrasound].

Sensational thresholds of the skin of fingers, palm and forearm have been determined in 5 healthy subjects ageing from 20 to 49 years. About 100 summation curves were obtained. Critical duration of the electrical stimuli remained constant in various areas. Critical duration of ultrasonic stimulation increased from fingers to forearm. The data obtained together with those found in literature suggest that critical duration of the stimulus is associated with the diameter of nonmyelin nervous fibers which are affected by the stimulus increasing with the increase in fiber diameter.

Adult↗