Animals were video-tracked using the EthoVision 2.3 system (Noldus Information Technology, Wageningen, the Netherlands; http://www.noldus.com) using an image frequency of 4.2/s. Raw data were transferred to Wintrack 2.4 (http://www.dpwolfer.ch/wintrack) for offline analysis.
For fear-conditioning protocols, animals were video-tracked using the ANY-maze system (Anymaze, Stoelting, Wood Dale, IL, USA; www.anymaze.com).
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