“…Further, splaying of the tetrode tips has been a valid concern during chronic implantation (Jog et al, 2002). Because of these constraints, their use for electrophysiological recordings in primates in deep structures has been relatively sparse and just recently reported (Erickson and Desimone, 1999;Erickson et al, 2000;Feingold et al, 2012;Santos et al, 2012;Skaggs et al, 2007;Thome et al, 2012). Among these, earlier studies employed tetrodes for electrical recording in the perirhinal cortex of the macaque using a telescoping guide tube system with twisted wire tetrodes glued inside 30 gauge stainless steel tubes (Erickson and Desimone, 1999;Erickson et al, 2000).…”