“…Data from a 1,094,886-trial lexical decision task showed that people slow down after an error, and a diffusion model decomposition showed that this slowdown can be attributed almost exclusively to an increase in response caution. This result confirms the traditional explanation of PES in terms of selfregulation and cognitive control (e.g., Botvinick et al, 2001;Cohen et al, 2000;Brewer & Smith, 1989;Fitts, 1966;Hajcak et al, 2003;Li et al, 2006;Rabbitt & Rodgers, 1977;Shiels & Hawk, 2010;Smith & Brewer, 1995;Tops & Boksem, 2010;Verguts, Notebaert, Kunde, & Wühr, 2011;Vickers & Lee, 1998): that is, people adaptively change their response thresholds to a possibly nonstationary environmentby becoming more daring after each correct response, and by becoming more cautious after each error, people reach an optimal state of homeostasis that is characterized by fast responses and few errors.…”