Human brainstem activation underpinning offset analgesia changes in perceived pain intensity. An ultra-high field functional magnetic resonance imaging investigation. - Lewis S. Crawford; James Wm Kang; Ashleigh H. Wake; Thomas Love; Paul M. Macey; Kirsty Bannister; Tor D. Wager; Vaughan G. Macefield; Kevin A. Keay; Luke A. Henderson (NeuroImage, 2026)