Research devoted to characterizing phenomena is underappreciated in philosophical accounts of scientific inquiry. This paper develops a diachronic analysis of research over 100 years that led to the recognition of two related electrophysiological phenomena, the membrane potential and the action potential. A diachronic perspective allows for reconciliation of two threads in philosophical discussions of phenomena-Hacking's treatment of phenomena as manifest in laboratory settings and Bogen and Woodward's construal of phenomena as regularities in the world. The diachronic analysis also reveals the epistemic tasks that contribute to establishing phenomena, including the development of appropriate investigative techniques and concepts for characterizing them.

Analogical reasoning is one of the most common ways individuals bring previous experience to bear on unfamiliar situations. Most theories describe this process as a structured comparison that involves mapping the relational properties between a familiar source and unfamiliar target. This both allows the transfer of useful inferences from the source to the target and highlights the common structure shared by both analogs, represented by an abstract schema. This schema can help with identifying and reasoning about structurally similar situations in the future. While researchers have studied how representations of source and target analogs undergo alterations as a result of this mapping process, little attention has been paid to how the abstract schemas thought to guide future analogical reasoning might similarly change with use. We explore this question in two experiments and present evidence that suggests abstract schemas do indeed drift under certain conditions.