Volume 30 #2

Contents

1. Results and future trends of sensory perception researches with the use of focused ultrasound
2. Auditory detection and classification of amplitude modulation: psychophysical and electrophysiological data
3. Features of speech describing tactile perceived fragmentary images by teenagers with normal and impaired vision
4. Spatial resolution of human auditory system in case of localization of approaching and withdrawing continuous and broken sound images
5. Age-dependent dynamic of sensitivity to androstenone in females
6. The reactions of the ensemble of the auditory nerve fibers in the growth of loudness and intensity discrimination of the efficient pulses presented before and after the disturb pulses

The analysis of psychophysical data relevant to the detection of sinusoidal amplitude modulation and determination of its period is provided. Significant and not yet fully investigated adaptation processes cause a significant decrease of the modulation thresholds during a few seconds of continuous stimulus. An even greater impact on the detection and classification thresholds can cause the directed training. Detection of modulation can be provided in wide frequency bands, as evidenced by the ability of a person to detect the presence of synchronicity in different frequency bands, as well as the phenomenon of comodulation masking release. Physiological studies (most of which were performed on amphibians) also demonstrate the important role of adaptation to the mean level of the current signal during the process of detection and classification amplitude changes. Role of directed training is only beginning to be explored by physiological methods. Nevertheless, the first results already suggest that in this way it could be not only justify specific psychophysical data, but also reveal important principles of functioning of the sensory systems and processes of memorizing.

Key words: amplitude modulation, psychophysics, short-term and long-term adaptation, training, auditory processing

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