[lumberjim]

i think if you have a particular word that always eludes you, maybe it indicates a trauma or damage to the locale on the brain where that is stored. also, i visualize brain pathways like rivulets, so when you repeatedly go down the wrong track looking for a word, you are reinforcing that error each time. For a few years when i was a kid, i would think yellow, but say red. there is still an association in there, but ive gotten around it.