Activity of a pyramidal tract projecting cell (PTN) of the motor cortex during walking on the flat surface and horizontal ladder with crosspieces 5 cm wide. The crosspieces had flat tops and were positioned 25 cm apart. the cell was recorded in track 21 of cat 7 (see cortical map). Latent period of cell’s response to electrical stimulation of the pyramidal tract was 0.9 ms; collision test was satisfied. The cell was activated by adduction of the contralateral shoulder, that is by the shoulder movement toward the body. This PTN was one of the 145 neurons, activity of which was reported in Stout and Beloozerova, 2013.
This PTN was recorded simultaneously with a group of neurons from the ventrolateral thalamus, VL 115 (group) recorded in track 3. VL neurons responded to touch and movement of the contralateral hip. PTN is recorded on channel 2, VL group is recorded on channel 1.

Activity of a pyramidal tract projecting neuron (PTN) of the motor cortex during walking on the flat surface and horizontal ladders with crosspieces 18, 12 and 5 cm wide. In all ladders the crosspieces had flat tops and were positioned 25 cm apart. Cell was recorded in track 22 of cat 7. Latent period of cell’s response to electrical stimulation of the pyramidal tract was 0.95 ms; collision test was satisfied. The cell was activated by ventral flexion of the contralateral wrist, that fingers moving down.

Activity of a pyramidal tract projecting neuron (PTN) of the motor cortex during walking on the flat surface and horizontal ladders with crosspieces 18, 12 and 5 cm wide. In all ladders the crosspieces had flat tops and were positioned 25 cm apart. Cell was recorded in track 22 of cat 7. Latent period of cells’ response to electrical stimulation of the pyramidal tract was 0.9 ms; collision test was satisfied. The cell was activated by flexion of the contralateral shoulder, that is, the shoulder forward movement.