Figure 1—figure supplement 1.

(A) Spectral clustering (scikit-learn) was used to cluster the continuous eye angle over each bout for both eyes. The initiation of hunt sequences was identified using Cluster three and deconvergence of the eyes was demarked by Cluster 1. (B) Hunt sequence types in the dataset. The user’s only role is to denote the last bout of the hunt sequence, characterize the sequence as a strike hit, strike miss, or abort, and note the chosen prey ID assigned by our automated prey reconstruction algorithm. The program then outputs the descriptors in B per hunt. ‘Collisions’ imply that the fish head has collided with the wall during the hunt (detected using fish COM and edge coordinates), preventing analysis of whether the fish would have struck or aborted. Collisions with unknown target are likely hunting of a paramecium reflection. Deconvergence, known target and unknown target, is the standard abort described previously (Johnson et al., 2019; Henriques et al., 2019), with ‘unknown targets’ being too ambiguous for the user to make a call on pursued prey ID. No deconvergence, known target are hunts where fish had initiated to and pursued a particular prey item, but clearly stopped pursuit on a particular bout not assigned to Cluster 1. ‘Probably not a hunt’ was a rare case where the fish converged, swam through the tank without choosing a prey, and did not deconverge within eight bouts. ‘Strike at Nothing’ was another rare case where the fish converged and struck without a prey item present. The fish did spend some time striking at immobile objects that were almost invariably residue stuck to the top of the tank. During strike hits, fish choose a prey and consume it, with strike misses typically a deflection of the prey off the fish’s mouth at hunt termination. The main manuscript is built off of strike hits and misses (which combined into a ‘strikes at known prey’ category would be the most common outcome), while Supplementary Figure 3’s abort algorithm is built from known target, deconverge and no-deconverge hunts. Collisions are simply an outcome of having a relatively small tank for parfocal imaging compared to the fish’s real environment; hunts resulting in collisions were not analyzed except for the initial choice.