<i>cat-2</i> mutants achieve greater peak acceleration, resulting in large fluctuations in the speed within tracks.

<p>The average (A) standard deviations of speed measurements within individual tracks, (B) magnitude (root mean square) of accelerations, (C) duration of accelerations, and (D) acceleration peaks for animals on a bacterial lawn. p-values for differences between data curves for each genotype were calculated using two-way ANOVA. Tracks were first grouped by average speed. Each bin is 0.03 mm/sec wide. Error bars, SEMs. (wild-type n = 358 tracks; <i>cat-2(n4547)</i> n = 262 tracks, all tracks >30 sec)