I suspect many of us assume mental images come from memory. One October morning, you see a maple blazing red leaves, and then that night you dream of swaying in red-leafed maples. But images must be more than memory's projection onto your imagination's screen. Take the case of the blind painter.

At least one man blind all his life, a Turkish fellow named
Esref Armagan, paints exceptionally accurate depictions of landscapes. With eyes that have never seen maples as we know them, he and his brush can render
trees with precisely scaled detail down to the browns and reds and greens and golds we'd expect from a "realist" or at least an impressionist. So, how can a man whose eyes have never seen objects paint ponds and mountains and stones with realistic accuracy? How does his brain's visual cortex light up when painting in a way our visual cortex would do so if we closed our functioning eyes and visualized a tin can tied to an old man's ankle or Rin Tin Tin scratching his back on wet green grass?
When I told two good writer friends--he writes about space rocket entrepreneurs; she, for American Express--about this story, he said, "Oh, c'mon." She said, "That's a bunch of crap." "How does anyone know for sure he's not faking it?" he said. "Just because it's in Sciencenews doesn't mean anything," she said. "This guy's scamming these scientists," he said. Their hostility shocked me into silence, frankly. What in this story threatens people? I suspect my friends--whose skepticism I usually appreciate and who are perhaps jaded by living in Woodstock, NY, where every other person has a "dubious" notion about fairy worlds and blue energy fields--held tight to the idea that mental images must stem from memory and that sensory memory MUST fill a painter's imagination with a reservoir of images from which to draw; hence, no person blind all his life possibly could paint landscapes with any degree of representational accuracy without a lot of coaching and conniving goin' on.

Well, one explanation draws from current cognitive science. Blogger
Hannibal performs a fairly good job of explaining how neurons fire and create images without memory's benefit. In addressing a similar line of questioning in relation to this painter, Hannibal draws largely upon cognitive scientist Daniel Dennet's book
Consciousness Explained to offer a fairly lucid neurological explanation:
There are neurons that fire in certain patterns in response to particular kinds of visual stimuli, but they don't "encode" any information that's then "decoded" by some "I" located somewhere else. These neuronal firings also don't "represent" anything, because that presumes that there's someone "in there" to whom and for whom the patterns do their re-presentation. When my visual cortex lights up, either in response to visual stimuli coming in from the optical nerve or because I'm engaged in the act of visualizing something, that's all that's going on in there. There's no other part of my brain or part of my person who represents the ultimate "I" and who has to take a gander at all that visual cortex activity in order for "me" to sort out what I'm "looking" at.
In essence, Hannibal suggests that there's little fascinating in a blind man's abilities to render painted images so "realistically" since the brain's chemistry fires images without visual memory's benefit. I understand and respect both Hannibal's and Dennet's perspective; in fact, neuroscience fascinates me. Still, brain scientists, as Hannibal seems faithfully to assume, do not have final say on what makes us "us" anymore than theologians of centuries past. Or at the very least, this reductive response doesn't satisfy my curiosity. To suggest we and our imaginations are little more than the brain's random neuronal firing reduces, in fact, Einstein's claim that "imagination is more important than knowledge." Without imagination, I would posit, science as we know it ironically would not exist. Exceptional brain scientists must require imagination to diagram miniscule neuronal circuitry like branching and rooted trees. Darwin drew not just upon his sensory observation and intellect but also possibly upon his active imagination to theorize human beings' evolution from apes (Lesser biologists might have seen the same phenomenon through their windows smudged with religious prejudice and drew no new conclusions). Even Descartes himself--held culpable with good reason or not for so much reductive scientific thinking and assumptions--drew upon dreams to develop some of his theories regarding thought and existence. (Wonder, after all, Descartes deems "the first passion," and wonder requires imagination.)
I wonder, for instance, about other senses' role in shaping visual images. I wonder how Armagan's nose's ability to inhale dried leaves' musk, his skin's ability to absorb the touch of wind that also blows through trees' leaves, his ears' ability to take in dried leaves' cracks as his sneakers and cane trek along a wooded path in Turkey might influence the artist's visual imagination. I wonder what happens to Armagan's brain if I were to read to him a descriptive passage, say, from Annie Dillard's
Pilgrim at Tinker Creek. I wonder if Armagan's dog recalls the next day images of kitties from her night dreams or if his dog dreams of trees she's never seen.
I wonder what blinds us to wonder. Too much thinking we know? Too much need to have the final say? The mightiest say? Am I culpable of same said desire?
Images are more than memory's projection. Agreed. But images, too, are more than our neuron's random chemical combustion. Of that I'm convinced. But what then creates them and how exactly Armagan's imagination paints images on his skull's inner walls I (and Hannibal and Dennet and others) am not certain. More later. I welcome your speculation (and corrections).