[Quantitative estimation of the perception of the frequency of tonal sounds by human].

The possibility of a purely instrumental investigation of the sensory characteristics of human in the real time scale has been shown using an analyzer of tonal hearing as an example. In accordance with the previously developed approach, the mean-square errors of the deviation of the instantaneous frequency of tonal sounds from its average value upon their vocal reproduction by persons being tested as well as upon their reproduction by a special electronic sound generator requiring a continuous comprehended regulation for maintaining the wanted frequency were chosen as these characteristics. It was found that the mean-square deviation of the current reproducible frequency linearly depends on the average frequency of the reproducible tonal sound.

[Possibilities of quantitative assessment of perception of weight by the muscle analyzer].

The possibility of creating purely instrumental methods to study the sensory sphere was shown by an example of a muscle analyzer. The methods are necessary for the development and optimization of man-machine systems, in particular, virtual reality. Earlier the connection between a stimulus and perception was estimated by a statistical analysis of subjective answers of an examinee concerning the perception and lack perception or the difference between two similar stimuli.

["Pulse" piezoceramic transducer].

A piezoceramic acceleration sensor "Pulse", devised by the Gorky Scientific-Research Radiphysical Institute is described. The use in the sensor's design of a flexing sensitive element provides for high sensitivity and great power output of the instrument. This helps to easily coordinate the operation of the sensor with that of the recording devices and to record both the low-frequency curves, viz.