. (2011, 2014) studies had prior exposure to auditory-visual conditional discrimination training, and the participants in Holmes et al. This study examined whether nonreinforced contiguous presentation of visual stimuli by means of complex stimuli in a simple discrimination context would lead to emergent simple and conditional relations between the complex elements. 1. Conditional discrimination training involves teaching an individual to differentiate between two or more stimuli based on multiple characteristics. One of the benefits of training using complex sample stimuli is that training two or more stimulus-stimulus relations.