“…The number of marbles that have been buried is then counted by an observer, who is often blind to the treatment status of the subjects (Angoa-Pérez et al, 2013;Egashira et al, 2018;Millan et al, 2002). Importantly, since the majority of investigations do not distinguish between the specific behavioral patterns resulting in marbles being lowered into the burying substrate Gaikwad & Parle, 2011;Gomes, Casarotto, Resstel, & Guimarães, 2011;Harasawa, Ago, Itoh, Baba, & Matsuda, 2006;Honda, Kawaura, Soeda, Shirasaki, & Takahama, 2011;Li et al, 2006;Matsushima, Shirota, Kikura-Hanajiri, Goda, & Eguchi, 2009;Shimazaki, Iijima, & Chaki, 2004;Umathe et al, 2012;Yamada et al, 2002), the term Bburied^is generally applied to indicate the number of covered marbles. Although the reported methodologies always refer to the duration of exposure as well as the number of marbles and the burying substrate used, several experimental variables are subject to modification, either intentionally or not.…”