  Nosek and colleagues (2011) suggest that the second generation of research on implicit social cognition will come to be known as the “Age of Mechanism”. Several metaphysical questions fall under this label. One question crucial to the metaphysics of implicit bias is whether the relevant psychological constructs should be thought of as stable, trait-like features of a person’s identity or as momentary, state-like features of their current mindset or situation (§2.4). While current data suggest that implicit biases are more state-like than trait-like, methodological improvements may generate more stable, dispositional results on implicit measures. Ongoing research on additional psychometric properties of implicit measures—such as their discriminant validity and capacity to predict behavior—will also strengthen support for some theories of the metaphysics of implicit bias and weaken support for others. Another open metaphysical question is whether the mechanisms underlying different forms of implicit bias (e.g., implicit racial biases vs. implicit gender biases) are heterogeneous. Some have already begun to carve implicit social attitudes into kinds (Amodio &amp; Devine 2006; Holroyd &amp; Sweetman 2016; Del Pinal et al. 2017; Del Pinal &amp; Spaulding 2018; Madva &amp; Brownstein 2018). Future research on implicit bias in particular domains of social life may also help to illuminate this issue, such as research on implicit bias in legal practices (e.g., Lane et al. 2007; Kang 2009) and in medicine (e.g., Green et al. 2007; Penner et al. 2010), on the development of implicit bias in children (e.g., Dunham et al. 2013b), on implicit intergroup bias toward non-black racial minorities, such as Asians and Latinos (Dasgupta 2004), and cross-cultural research on implicit bias in non-Western countries (e.g., Dunham et al. 2013a).