voluntarily enter them. I can imagine the sensations the animals would feel. If I had a calf's body and hooves, I would be very scared to step on a slippery metal ramp.
There were still problems I had to resolve after the animals left the dip vat. The platform where they exit is usually divided into two pens so that cattle can dry on one side while the other side is being filled. No one understood why the animals coming out of the dip vat would sometimes become excited, but I figured it was because they wanted to follow their drier buddies, not unlike children divided from their classmates on a playground. I installed a solid fence between the two pens to prevent the animals on one side from seeing the animals on the other side. It was a very simple solution, and it amazed me that nobody had ever thought of it before.
The system I designed for filtering and cleaning the cattle hair and other gook out of the dip vat was based on a swimming pool filtration system. My imagination scanned two specific swimming pool filters that I had operated, one on my Aunt Brecheen's ranch in Arizona and one at our home. To prevent water from splashing out of the dip vat, I copied the concrete coping overhang used on swimming pools. That idea, like many of my best designs, came to me very clearly just before I drifted off to sleep at night.
Being autistic, I don't naturally assimilate information that most people take for granted. Instead, I store information in my head as if it were on a CD-ROM disc. When I recall something I have learned, I replay the video in my imagination. The videos in my memory are always specific; for example, I remember handling cattle at the veterinary chute at Producer's Feedlot or McElhaney Cattle Company. I remember exactly how the animals behaved in that specific situation and how the chutes and other equipment were built. The exact construction of steel fenceposts and pipe rails in each case is also part of my visual memory. I can run these images over and over and study them to solve design problems.
If I let my mind wander, the video jumps in a kind of free association from fence construction to a particular welding shop where I've seen posts being cut and Old John, the welder, making gates. If I continue thinking about Old John welding a gate, the video image changes to a series of short scenes of building gates on several projects I've worked on. Each video memory triggers another in this associative fashion, and my daydreams may wander far from the design problem. The next image may be of having a good time listening to John and the construction crew tell war stories, such as the time the backhoe dug into a nest of rattlesnakes and the machine was abandoned for two weeks because everybody was afraid to go near it.
This process of association is a good example of how my mind can wander off the subject. People with more severe autism have difficulty stopping endless associations. I am able to stop them and get my mind back on track. When I find my mind wandering too far away from a design problem I am trying to solve, I just tell myself to get back to the problem.
Interviews with autistic adults who have good speech and are able to articulate their thought processes indicate that most of them also think in visual images. More severely impaired people, who can speak but are unable to explain how they think, have highly associational thought patterns. Charles Hart, the author of Without Reason, a book about his autistic son and brother, sums up his son's thinking in one sentence: «Ted's thought processes aren't logical, they're associational.» This explains Ted's statement «I'm not afraid of planes. That's why they fly so high.» In his mind, planes fly high because he is not afraid of them; he combines two pieces of information, that planes fly high and that he is not afraid of heights.
Another indicator of visual thinking as the primary method of processing information is the remarkable ability many autistic people exhibit in solving jigsaw puzzles, finding their way around a city, or memorizing enormous amounts of information at a glance. My own thought patterns are similar to those described by A. R. Luria in The Mind of a Mnemonist. This book describes a man who worked as a newspaper reporter and could perform amazing feats of memory. Like me, the mnemonist had a visual image for everything he had heard or read. Luria writes, «For when he heard or read a word, it was at once converted into a visual image corresponding with the object the word signified for him.» The great inventor Nikola Tesla was also a visual thinker. When he designed electric turbines for power generation, he built each turbine in his head. He operated it in his imagination and corrected faults. He said it did not matter whether the turbine was tested in his thoughts or in his shop; the results would be the same.
Early in my career I got into fights with other engineers at meat-packing plants. I couldn't imagine that they could be so stupid as not to see the mistakes on the drawing before the equipment was installed. Now I realize it was not stupidity but a lack of visualization skills. They literally could not see. I was fired from one company that manufactured meat-packing plant equipment because I fought with the engineers over a design which eventually caused the collapse of an overhead track that moved 1,200-pound beef carcasses from the end of a conveyor. As each carcass came off the conveyor, it dropped about three feet before it was abruptly halted by a chain attached to a trolley on the overhead track. The first time the machine was run, the track was pulled out of the ceiling. The employees fixed it by bolting it more securely and installing additional brackets. This only solved the problem temporarily, because the force of the carcasses jerking the chains was so great. Strengthening the overhead track was treating a symptom of the problem rather than its cause. I tried to warn them. It was like bending a paper clip back and forth too many times. After a while it breaks.
Different Ways of Thinking
The idea that people have different thinking patterns is not new. Francis Galton, in Inquiries into Human Faculty and Development, wrote that while some people see vivid mental pictures, for others «the idea is not felt to be mental pictures, but rather symbols of facts. In people with low pictorial imagery, they would remember their breakfast table but they could not see it.»
It wasn't until I went to college that I realized some people are completely verbal and think only in words. I first suspected this when I read an article in a science magazine about the development of tool use in prehistoric humans. Some renowned scientist speculated that humans had to develop language before they could develop tools. I thought this was ridiculous, and this article gave me the first inkling that my thought processes were truly different from those of many other people. When I invent things, I do not use language. Some other people think in vividly detailed pictures, but most think in a combination of words and vague, generalized pictures.
For example, many people see a generalized generic church rather than specific churches and steeples when they read or hear the word steeple. Their thought patterns move from a general concept to specific examples. I used to become very frustrated when a verbal thinker could not understand something I was trying to express because he or she couldn't see the picture that was crystal clear to me. Further, my mind constantly revises general concepts as I add new information to my memory library. It's like getting a new version of software for the computer. My mind readily accepts the new «software,» though I have observed that some people often do not readily accept new information.
Unlike those of most people, my thoughts move from videolike, specific images to generalization and concepts. For example, my concept of dogs is inextricably linked to every dog I've ever known. It's as if I have a card catalogue of dogs I have seen, complete with pictures, which continually grows as I add more examples to my video library. If I think about Great Danes, the first memory that pops into my head is Dansk, the Great Dane owned by the headmaster at my high school. The next Great Dane I visualize is Helga, who was Dansk's replacement. The next is my aunt's dog in Arizona, and my final image comes from an advertisement for Fitwell seat covers that featured that kind of dog. My memories usually appear in my imagination in strict chronological order, and the images I visualize are always specific. There is no generic, generalized Great Dane.
However, not all people with autism are highly visual thinkers, nor do they all process information this way. People throughout the world are on a continuum of visualization skills ranging from next to none, to seeing vague generalized pictures, to seeing semi-specific pictures, to seeing, as in my case, in very specific pictures.
I'm always forming new visual images when I invent new equipment or think of something novel and amusing. I can take images that I have seen, rearrange them, and create new pictures. For example, I can imagine what a dip vat would look like modeled on computer graphics by placing it on my memory of a friend's computer screen. Since his computer is not programmed to do the fancy 3-D rotary graphics, I take computer graphics I have seen on TV or in the movies and superimpose them in my memory. In my visual imagination the dip vat will appear in the kind of high-quality computer graphics shown on Star Trek. I can then take a specific dip vat, such as the one at Red River, and redraw it on the computer screen in my mind. I can even duplicate the cartoonlike, three-
