Figure 3

The histopathologic findings after stimulation on Brain (a), C-spine (b), T-spine (c) and L-spine (d). The stimulating electrode was implanted on the motor cortex. We stimulated the brain, C-spine, T-spine and L-spine at a frequency of 2 Hz and 50% of the movement threshold of 1 V (als-1), a frequency of 50 Hz and 50% of the movement threshold of 0.7 V (als-2) and a frequency of 70 Hz and 50% of the movement threshold of 0.6 V (als-3) for continuously 24 hours. There were no significant differences in the number of neurons showing degenerative changes between the stimulating and reference sites.