Four out of 84 recording sessions were excluded before analysis for technical reasons, leaving a total of 80 sessions (R117: 19, R119: 21, R131: 19, R132: 21) with 921 LFPs (R117: 229, R119: 212, R131: 228, R132: 252, representing a total of 614 h of LFP data) and 53 putative FSIs (R117: 23, R119: 14, R131: 2, R132: 14).