The familiarity bias implies that foragers have greater experience t ir for some resources than others, and also a more accurate assessment a ir of rewards e ir. Since learning rate λ i typically evolves to high values , an expected reward a ir is generally an accurate estimate of the actual reward e ir. The main cause for differences in familiarity is therefore differences in processing experience t ir and these determine differences between reward e ir and expected reward a ir. As a result, the impact of social influences on learning therefore concern (i) biases on choosing resource types, which indirectly affect experience t ir in the case of LE and SE, and (ii) direct gains in experience t ir in the case of OL.