 Early life experiences can have long lasting effects on behaviour, with some behaviours being more sensitive to stress than others. This study looked at how these effects vary over different developmental stages in C. Elegant's Worms They found that dopamine and serotonin play opposing roles in shaping behavioural responses to stress. Dopamine helps buffer behavioural responses during intermediate developmental stages while serotonin promotes behavioural sensitivity to stress during early and late stages. Additionally, they discovered that there were multiple individuality dimensions that existed within stressed and unstressed populations, suggesting that each individual has their own unique response to early life experiences. This article was authored by Rimi Ali-Nasa, Yuval Horro, and Shea Stern.