Research in infant development has revealed that infants develop through complex interactions with their surrounding environment. However, longitudinal research on infant motor behavior development in their natural home settings remains scarce. Therefore, this study aims to elucidate aspects of the relationship between infant motor behaviors and their home environment by examining the traces, a concept within Gibson's (1979) theory of affordances. Using video recordings of infants at home from four to five months of age until the onset of walking, we extracted repetitive motor behaviors and analyzed the types of motor behaviors and the traces that emerged. The findings suggest that traces function as resources for motor behaviors, leading to continuous actions. As infants repeatedly engage with their environment, traces provide opportunities for perceiving the properties of the environment and objects, gradually leading to motor behaviors that utilize the environment. Furthermore, since auditory changes can also serve as resources for infants' motor behaviors, reconsidering environmental changes, including sounds, as traces warrants further investigation.
