Vsevolod Lyakhovetskii

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The spatial distribution of horizontal internal connections in field 17 of the cat cortex was studied after microiontophoretic application of horseradish peroxidase to individual cortical columns. Cluster analysis of the distribution of labeled cells in the superficial layers in the tangential plane of the cortex was performed. Field 17 included 7 +/- 1(More)
An important stage in learning, i.e., the acquisition of a new skill, is the repetitive reproduction of a sequence of movements, which plays a significant role in the formation of motor stereotypies. Two groups of right-handed subjects reproduced (6–10 repeats) sequences of movements guided by the experimenter, sequences consisting of six positions, first(More)
An original musculoskeletal model of the hindlimbs of cats able to walk in the sagittal plane retaining lateral stability in the frontal plane was developed in MatLab. The skeletal part of the model (vertebral column, pelvis, hips, knees, ankles) was created in the SimMechanics module. The articulation of the vertebral column with the support block and the(More)
The musculoskeletal model of cat's hind limbs, capable to step while maintaining balance, was developed using the MatLab. The skeletal part of the model (spine, pelvis, hips, shanks, foots) was created at SimMechanics. The joint in the spine attachment to the support and hip joint have three degrees of freedom. Knee and ankle joints have one degree of(More)
An important stage of learning a new skill is repetitive reproduction of one and the same sequence of movements, which plays a significant role in forming of the movement stereotypes. Two groups of right-handers repeatedly memorized (6-10 repetitions) the sequences of their hand transitions by experimenter in 6 positions, firstly by the right hand (RH), and(More)
The errors of right- and left-handers were analyzed when they performed memorized sequences by right or the left hand during the task that activates positional coding: after six to ten times, the order of movements changed (the positions remained the same during the task). The task was at first performed by one (initial) hand, right or left, and then by the(More)
The error distributions of sensory screen touches at kinesthetically memorization and reproduction of visual stimuli containing Muller-Lyer illusion and neutral stimuli were investigated. One group of right-handers begins the task with the right hand and continues with the left one, while the other group--vice versa. It was shown that the errors are(More)
The age-related characteristics of motor short-term memory on reproduction of a memorized sequence of six movements with the right or left hands were studied in two groups of subjects (right-handed, aged 18–25 and 35–60 years). The mean magnitudes of all movement errors were found to be significantly greater in the older subjects. More detailed analysis(More)
Age-specific features of motor short-term memory were studied. Two groups of right-handed volunteers (18-25 and 35-60 years old) reproduced the memorized sequence of six movements by the right hand or by the left one. The mean values of erroneous movements are shown to be significantly higher in elder group, demonstrating the age-dependent reduction of(More)