“…In fact, some studies find that humans demonstrate a bias toward self-control, rather than optimizing (Kirk & Logue, 1996;Reed et al, 2011;Sonuga-Barke, Lea, and Webley, 1989). For example, Kirk and Logue (1996) noted that adult humans tended to pick a larger, delayed reinforcer, even when this choice did not lead to the greatest overall number of reinforcing outcomes. In order to explore this issue, a three-alternative choice procedure is needed, which was previously developed by Reed et al (2011), where one alternative reflects 'impulsivity' (small-immediate, reinforcers), one 'self-control' (large-delayed reinforcers), and a third option leads to optimal performance (a reinforcer with intermediate size and delay).…”