Fig. 7.

Conjugate vergence of the eyes during prey capture. (A) Frames from a high-speed video illustrating low (left, 37 deg) and high (right, 71 deg) eye vergence angles. Scale bar, 250 μm. (B) Eye vergence angles immediately before detection of the paramecium (N=50). There is no relationship between vergence and distance from prey prior to detection. Trend line is a linear fit. (C) Eye vergence angles immediately after detecting the prey (N=183). Vergence data following the capture maneuver are not included here (N=50). Once the capture sequence is initiated, the eyes increasingly verge as a function of distance from the paramecium. Trend line is a linear fit. **P<0.001 following Spearman's rank test (ρ).