No abstract

The article is devoted to the specific consideration of the cochlear transduction for the low level sound intensities, which correspond to the regions near the perception threshold. The basic cochlea mechanics is extended by the new concept of the molecular filters, which allows us to discuss the transduction mechanism on the molecular level in the space-time domain. The molecular filters are supposed to be built on the set of the stereocilia of every inner hair cell. It is hypothesized that the molecular filters are the sensors in the feedback loop, which includes also outer hair cells along with the tectorial membrane and uses the zero compensation method to evaluate the traveling wave shape on the basilar membrane. Besides the compensation, the feedback loop, being spatially distributed along the cochlea, takes control over the tectorial membrane strain field generated by the outer hair cells, and implements it as the mechanism for the automatic gain control in the sound transduction.

The article is intended to propose the new technique for analysis and visualization of vectorcardiograms based on the 3D phase diagrams. The regular Frank 3D lead system was considered as the signal source to construct 3D vector space. The three cardio signals from the lead system, representing the currents in the body, and the three integrated in time signals, representing the corresponding charge flows, were used to form 3D phase diagram. This diagram is considered as a new compact description of the dipole object properties in the 3D space, combining simultaneously information about the charge movements and the changes in values and orientation of the current. The regular properties, like the angular momentum of the charge flow and the dipole strength vectors and their covariance can be evaluated from the real vectorcardiogram. Based on the set of vectorcardiograms for 8 healthy controls and 7 myocardial infarction patients the 3D phase diagrams and their statistical parameters are evaluated and discussed. An example is given of the technique implementation for the comparison of the 3D phase diagrams in a control and a myocardial infarction patient.

The article is devoted to the specific consideration of the cochlear transduction for the low level sound intensities, which correspond to the regions near the perception threshold. The basic cochlea mechanics is extended by the new concept of the molecular filters, which allows discussing the transduction mechanism on the molecular level in the space-time domain. The molecular filters are supposed to be built on the set of the stereocilia of every inner hair cell. It is hypothesized that the molecular filters are the sensors in the feedback loop, which includes also outer hair cells along with the tectorial membrane and uses the zero compensation method to evaluate the traveling wave shape on the basilar membrane. Besides the compensation, the feedback loop, being spatially distributed along the cochlea, takes control over the tectorial membrane strain field generated by the outer hair cells, and implements it as the mechanism for the automatic gain control in the sound transduction.

No abstract