“…Furthermore, FFs could sustain higher frequency firing than MPs with large suprathreshold depolarizing current injections. The fact that FFs fire narrower spikes than MPs suggests FF may correspond to “narrow” units identified during extracellular recordings of LC neurons, while MP may correspond to those “wide” units (Su & Cohen, 2022; N. K. Totah, Neves, Panzeri, Logothetis, & Eschenko, 2018). However, “narrow” units are heavily biased toward the ventral part of the LC (Su & Cohen, 2022; N. K. Totah et al, 2018), while FFs as we described here may be dorsally biased (Loughlin et al, 1986).…”