The MR image is a map of the distribution of the MR signal, and by manipulating the timing of the RF pulses and the delays before detecting the signal MRI is a sensitive tool for detecting subtle changes in brain anatomy. However, mapping brain structure is not the same as mapping brain function.
John Adams was seen and identified as an early leader in the Continental Congress by his peers, and his influence greatly aided the formation of the Declaration of Independence and the cause of separation from Great Britain.
John Adams died in 1826 during the presidency of John Quincy Adams. Most of Abigail Adams's correspondence is in the Adams Family Papers and the Warren-Adams Letters, both at the Massachusetts Historical Society. The largest published collection of her letters is contained in L. H. Butterfield, ed., The Adams Papers: Adams Family Correspondence, 4 vols. (1963-73).