“…Extended pausing in discriminable rich-lean transitions has been shown to be a general phenomenon in the laboratory. It has been replicated with rats (Baron et al, 1992;Baron et al, 1999;Brewer et al, 2017;Galuska & Yadon, 2011;Sawyer et al, 2019;Wade-Galuska, et al, 2005), pigeons (Langford et al, 2019;Perone & Courtney, 1992;Retzlaff et al, 2017;Toegel, 2017), hens (Harris et al, 2012;Young et al, 2017), monkeys (Galuska et al, 2007), and humans (Williams et al, 2011). It has been shown to occur when the operational definitions of the rich and lean components are based on reinforcer magnitude (e.g., Perone & Courtney, 1992), reinforcer delay (e.g., Harris et al, 2012), response requirement (e.g., Baron et al, 1992), and response-force requirement (e.g., Wade-Galuska et al, 2005).…”