Switch

Time (min)

Distance (cm)

N

Group

-

20

-

6

1 (control)

on

10

10

6

2

off

10

10

6

3

on

20

10

6

4

off

20

10

6

5

on

10

20

6

6

off

10

20

6

7

on

20

20

6

8

off

20

20

6

9