Evidence that we form and use mental images. Problem is that some people argue forming images is like seeing; process that is very different from verbal processing; difference is like difference between analog and digital. Analog has how much day is left encoded; digital does not. In image, always possible to see what we have not seen before; in verbal description, can only get what is written/spoken, nothing else. Some people argue that it is all digital since it involves neurons and there are no actual pictures in brain; like a computer. Task 1: categorize each word as a noun or a non-noun in a sentence. Task 2: look at a block letter and then, from memory, categorize each corner as a point on a) the extreme top or bottom or b) a point in between. B) tap with the left hand for each noun, and right hand for each non-noun.