Stimulus-seeking in rats is accompanied by increased c‑Fos expression in hippocampal CA1 as well as short 22 kHz and flat 50 kHz calls. - Robakiewicz I; Polak M; Rawska M; Alberski D; Polowy R; Wytrychiewicz K; Syperek M; Matysiak J; Filipkowski RK (Acta neurobiologiae experimentalis, 2019)