Table 1.
Kinematic parameters of startle behavior before and after Mauthner cell ablation
|
|
Head angle (°) |
Head angular velocity (°/msec) |
|---|---|---|
| Ectopic M-cells in R2a | ||
| R2 and R4 ablation | ||
| Preablation | ||
| Intact side | 119.12 (5.80)c | 19.34 (1.02) |
| Ablation side | 113.76 (4.07) | 18.15 (0.79) |
| Postablation | ||
| Intact side | 111.28 (4.42) | 18.02 (1.02) |
| Ablation side | 88.10 (4.49) | 14.28 (0.86) |
| R2 ablation | ||
| Preablation | ||
| Intact side | 118.59 (6.01) | 20.83 (0.74) |
| Ablation side | 112.44 (5.95) | 19.00 (0.89) |
| Postablation | ||
| Intact side | 122.48 (4.91) | 20.96 (0.92) |
| Ablation side | 122.74 (4.85) | 19.31 (0.89) |
| R4 ablation | ||
| Preablation | ||
| Intact side | 108.71 (6.18) | 19.24 (0.73) |
| Ablation side | 118.27 (3.22) | 20.50 (0.81) |
| Postablation | ||
| Intact side | 109.02 (5.43) | 18.62 (1.16) |
| Ablation side | 108.69 (6.23) | 17.47 (0.80) |
| Normal fishb | ||
| R4 ablation | ||
| Preablation | ||
| Intact side | 123.76 (4.44) | 19.85 (0.42) |
| Ablation side | 113.36 (4.51) | 18.01 (1.25) |
| Postablation | ||
| Intact side | 108.59 (6.48) | 19.93 (0.67) |
| Ablation side |
80.96 (2.97) |
14.56 (0.64) |
Angle and angular velocity of head movement are shown before and after ablation in Mauthner cells in rhombomeres 2 and 4, rhombomere 2, or rhombomere 4, and before and after rhombomere 4 M-cell ablation in normal fish. The ablation side refers to startles toward the side of the body to which the targeted neurons project, whereas the intact side refers to turns to the opposite side of the body.
a
Fish with ectopic Mauthner cells: n = 5 fish per ablation regime; three trials per treatment per fish.
b
Normal fish: n = 3 fish; three trials per treatment per fish.
c
Mean ± SEM.