In MCI, memory test performance (percentage high confidence hits) is (a) negatively related to hippocampal activation (r = −0.43, p = 0.09) and (b) positively related to AD signature cortical thickness (r = 0.38, p = 0.03). Additionally, (c), Hippocampal activation is negatively related to hippocampal volume (r = −0.53, p = 0.04).