Secondary responses are the reactions that occur after the initial response to a stimulus fades away. There are several synonyms for secondary responses, including subsequent reactions, follow-up responses, secondary reactions, and delayed effects. Each of these terms emphasizes the idea that the response occurs after the initial stimulus has been processed and that it may be different from the first response. Other synonyms for secondary responses include late responses, secondary adaptations, and secondary adjustments. These terms all describe the ways in which organisms respond to their environments over time, adapting and adjusting to new stimuli as they arise.