This lecture discusses the growth or decrease of inter-individual differences in human performance as participants practice, exploring the convergence or divergence across subjects. The instructor presents research findings on how subjects develop idiosyncratic solutions over time, emphasizing the importance of considering both the task and body features in expert performance. The lecture also delves into the neural level differences in the brain and the potential for practice in synergy space to lead to excellence in the task space, highlighting the need for customized training strategies based on individual features.