A related group of studies, including many more experimental controls, was reported Martha Farah (1985). Participants were asked to form an image of a certain letter-example, an H or a T. Very soon after, they were sometimes presented with one of …(ดูไม่ออก) letters but at a low level of contrast, making the letters very difficult to see. Those…(ดูไม่ออก) imagined a letter first were more accurate at detecting the actual presented letter…(ดูไม่ออก) they were at detecting another letter. These results suggest that imagery can “…(ดูไม่ออก)” the visual pathway used in detecting an actual stimulus (Finke, 1989). Some a…(ดูไม่ออก) even regard visual imagery as perceptual “anticipation”: the visual system “great …(ดูไม่ออก) ready” to actually see something (Neisser, 1976).