Thus, despite the anatomical and functional studies outlined above, it remains possible that increases in c-Fos expression within serotonergic neurons within the rostral DRD and DRV following exposure to the HL condition may be associated with anxiety-related behavior or its physiological correlates, while increases in c-Fos expression within serotonergic neurons within the DRC may be associated with locomotion, or its physiological correlates. Here, FOS is linked to Anxiety.