Panel A shows the extension of the smallest and largest unilateral and bilateral lesions schematically in slides based on the stereotaxic atlas by Paxinos and Watson (2004). The largest lesions are filled dark grey, the smallest lesions are filled light grey. Across all rats per lesion group, the rostro-caudal extensions of the unilateral lesions were (largest / smallest: - 2.76 mm–-3.24 mm / -3.12 mm–-3.24 mm), and for the bilateral lesions (largest/smallest: -2.04 mm–-4.36 mm / -3.00 mm–-3.12 mm). In panel B, representative histological pictures of the different groups are depicted: left: Control lesion, centre: Unilateral lesion, and right: Bilateral lesion.