The remaining 8 x 4 pads above now function as a step-sequencer -- with a sound selected, tapping these adds drum hits in the respective position in the drum loop.
But the Afghan leader's trip to Washington has been seen as a crucial step in negotiations over a bilateral security agreement that will determine the number and the function of US troops remaining in Afghanistan beyond 2014.
The next step is to figure out if stimulation also can help when recalling old memories, because that function can also be impaired with dementia, according to Nanthia Suthana, the first author on the study and a UCLA postdoctoral researcher.