Response bias has been demonstrated to adapt to all four types of changes in the decision environment (Henriques et al. 1994; Maddox and Bohil 1998; Bohil and Maddox 2001; Taylor et al. 2004; Fleming et al. 2010; Forstmann et al. 2010; Summerfield and Koechlin 2010; Reckless et al. 2013). In a rewarded
memory task, Taylor and colleagues Inhibitors,research,lifescience,medical (Taylor et al. 2004) demonstrated that as the payoff matrix changed, participants altered their response bias to maintain a strategy that optimized the amount of money that could be won. Motivation similarly affects response bias. In a recent perceptual decision-making study, we reported that when motivated, individuals adopted a more liberal response bias, that is, they were more likely to say a target stimulus was present, compared to when they were relatively less motivated (Reckless et al. 2013). This was in keeping with findings from a verbal MGCD0103 mw recognition task, where participants adopted a more liberal response bias when motivated compared Inhibitors,research,lifescience,medical to when unmotivated (Henriques et al. 1994). Both animal electrophysiological and human imaging studies have identified brain regions involved in accumulating and comparing sensory evidence (Binder et al. 2004; Heekeren et al. 2004; Pleger et al. 2006); however,
the region or regions which adjust Inhibitors,research,lifescience,medical the decision criterion from environment to environment have not been thoroughly investigated. Two possible candidate regions emerge. Heekeren and colleagues (Heekeren et al. 2004, 2006) have suggested that the left superior frontal sulcus (SFS) is involved in
comparing accumulated sensory evidence Inhibitors,research,lifescience,medical for different choices. In a face-house discrimination task, they found that activation in Inhibitors,research,lifescience,medical the left SFS varied with the difference in signal between regions of the brain representing face and house evidence. It was further found that disruption of this region using transcranial magnetic stimulation affected the rate at which sensory evidence was integrated as well as decision accuracy (Philiastides et al. 2011). Given that the left SFS is involved in handling the comparison of sensory evidence, it is possible that this region is also involved in adjusting how much evidence is needed before a decision is made—the role of the decision criterion. very Rahnev and colleagues (Rahnev et al. 2011), while examining the effect of prior expectations on visual discrimination, found that the more an individual became biased to a particular choice in response to a predictive cue, the greater the activation in the left inferior frontal gyrus (IFG). Reckless and colleagues (Reckless et al. 2013) similarly found a relationship between a motivation-induced shift toward a more liberal response bias and increased left IFG activation. However, the block design of their study limited the interpretability of this relationship.
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