During the first experiment we demonstrated a direct effect of similarity: subjects are more likely to select a toy to give to the Fennimal if this toy previously resulted in positive feedback when given to a similar Fennimal. In the second experiment we demonstrated an indirect effect of similarity: subjects are more likely to give a toy to the Fennimal if this toy previously resulted in positive feedback when given to a Fennimal that shares overlap to a Fennimal sharing overlap to the... Source: https://osf.io/3cm6e/