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Horizontal structure conveys diagnostic information for face identity (Dakin & Watt, J Vis 2009). Younger adults preferentially rely on this structure for identification (Goffaux & Dakin, Front Psychol 2010), and the extent of this horizontal bias correlates with identification accuracy in younger adults (Pachai et al., Front Psychol 2013). Older adults identify faces less accurately (Konar et al., Vis Res 2013) and exhibit less horizontal bias compared to younger adults, particularly when the diagnostic facial information is not explicitly defined (Sekuler et al., VSS 2014). Here, we examine whether training improves face identification in older adults, and whether enhanced face identification correlates with increased horizontal bias for diagnostic facial structure. Eleven older adults (67-77 years old) trained in a 1-of-10 face identification task for 1440 trials across 3 days. Before and after training, we assessed horizontal bias with …