Introduction: Stimulus induced decreases in BOLD-fMRI signal, also known as negative BOLD responses (NBR) have been reported in visual [1] and somatosensory cortices [2]. Although its cause remains unclear, calibrated fMRI studies suggest that at least 60% of the NBR is neuronal [3] as opposed to being a haemodynamic (or steal) artefact. In addition, the magnitude of the NBR has been shown to i...
