The concept of habituation, where people become accustomed to and less responsive to repeated stimuli, is the central theme explored across the podcast episodes provided.

The episodes explain how this psychological phenomenon can cause people to lose enthusiasm and fail to appreciate the good things in their lives, and provide strategies to counteract the effects of habituation.

The podcasts delve into the scientific research behind habituation and outline practical tips listeners can apply to 'resparkle' their life and rediscover joy in everyday moments.