“…Within each bout, short inter-response times (IRTs) separate individual responses; longer IRTs separate bouts (Brackney, Cheung, Herbst, Hill, & Sanabria, 2012; Brackney, Cheung, Neisewander, & Sanabria, 2011; Brackney & Sanabria, 2015; Hill, Herbst, & Sanabria, 2012; Johnson, Pesek, & Newland, 2009; Shull, Gaynor, & Grimes, 2001, 2002; Shull, 2004, 2011; Smith, McLean, Shull, Hughes, & Pitts, 2014; Tolkamp, Schweitzer, & Kyriazakis, 2000). The response bout has three characteristics: (a) the mean bout length , or how many responses the animal makes while in a bout, (b) the within-bout response rate , or how fast the animal responds while in a bout, and (c) the bout-initiation rate , or how frequently the animal begins a new bout.…”