Biomedical Engineering Reference
In-Depth Information
Similar observations were made for the 2D cursor control data. In Figure
4.18
, neuronal
subset examples for five segments with specific hand movement are displayed. In these segments,
the animal moved the hand in the positive diagonal direction; that is, the hand was moved back
and forth in 270º and 45º for about 2.5-5 sec. From these examples, we can observe neurons that
are consistently selected such as 69, 80, 84, 92, 99, 108, and 110. However, there are a number of
neurons that are selected only in particular segments such as 45, 54, 67, 149, etc. Most of selected
neurons were collected from the M1 area, yet some neurons from the PMd area join the subsets in
the last two segments (late parts of the data set).
When we compared neuronal subsets from our analysis to the sensitivity analysis obtained
from the trained models in the same data set [
7
], we were able to find consistency among neuronal
contributions. For instance, neurons 5, 7, 23, 71, and 93 in the 3D food reaching data were observed
in the top-ranked group of neurons sorted by sensitivity analysis. Also, neurons 54, 69, 80, 84, 92,
X
Y
40
0
-40
50
100
150
76
78
514
516
735 737
Time (sec)
1013
1015
1055
1058
FIgURE 4.1:
Neuronal subset examples for the 2D cursor control task.
