A Real-Time and Portable Bionic Eye Simulator - Biomedical Engineering Systems and Technologies - page 42

Fig. 13. Maze Test: Left - Mode vs. Average Time (seconds), Right - Mode vs. Average No. of
Collisions

Fig. 14. Maze Test: Left - Mode vs. Average Time (seconds), Right - Mode vs. Average Mistakes

tested in and shows how the same modes were tested repeatedly 3 times to examine
learning effects. The error bars show the standard error. 2-way, paired T-Tests were
conducted between the control time and each of the non-control modes, as well as
between the binary and 4-level thresholding for each pair of repeated tests (eg. 1st
binary with 1st 4-level).
The times taken for all non-control modes were significantly longer than control
mode ( p < 0 . 05 for all). The times taken for the binary modes were significantly longer
than the 4-level thresholding for the same repeated number of trial ( p < 0 . 05 for the 1st
and 2nd pairs of tests, p =0 . 063 for the 3rd pair). The times for all modes decreases
with increasing number of repeated tests.
The right graph in Figure 14 details the number of mistakes for each mode, averaged
over the 7 subjects. The error bars show the standard error. The average number of mis-
takes was quite low due to some subjects not making any mistakes. The trend however
clearly looks similar to the Chessboard Time graph with decreasing number of mistakes
with repeated trials.

5.3 Ball Interception Test

The graph shown in Figure 15 details the number of successfully intercepted balls for
each mode, averaged over the 7 subjects. Once again, the order of the modes reflects the
order the subjects were tested in, and the errors bars show standard error. 2-way, paired
T-Tests were conducted between the control mode and each of the non-control modes,
as well as between the relative non-control modes (4Hz vs 10Hz, 10Hz vs 60Hz).