Fig. 5. (A) Examples of the data obtained from two units recorded simultaneously with electrode 2 (E2, red) and electrode 3 (E3, blue). Left, responses to sphere movements in the AP direction; right in the PA direction. Top traces show original recordings. The two vertical lines in the bottom traces indicate the position of sphere start and stop trigger points. Between the two trigger points the time axis was transformed to equal the distance axis (23.8 cm). Vertical scale bars, 100 µV. (B) The position of the multi-electrode device relative to the fish midbrain surface is indicated (below). Red, E2; blue, E3. Colored circles to the left of the fish show sphere positions at times labeled 1, 2, 3 and 4 in A. Arrows indicate direction of sphere motion.