As the index page indicates, the last two books I've read are The Curious Incident of the Dog in the Night-Time, about an autistic kid, and Twisty Little Passages, about interactive fiction. In thinking them over it occurred to me that there's some real overlap there. I've since discovered that I'm not the first to make this observation — indeed, it was the primary point Espen Aarseth made in his analysis of Infocom's Deadline, in a subchapter entitled "Autistic Detective Agency." But while he identifies things like the way characters "often repeat themselves without making sense, and you may stand next to them for hours without any sign that they know you are there" and describes IF puzzle-solving as "inappropriate attachment to objects" (to square with an Encyclopedia Brittanica definition) I think the real situation is more complex.

In Incident, the narrator Christopher Boone says:

I see everything.
     That is why I don't like new places. [...] But most people are lazy. They never look at everything. They do what is called glancing [...] For example, if they are in the countryside, it might be

     1. I am standing in a field that is full of grass.
     2. There are some cows in the fields.
     3. It is sunny with a few clouds.

     But if I am standing in a field I notice everything. [...]
     1. There are 19 cows in the field, 15 of which are black and white and 4 of which are brown and white.
     2. There is a village in the distance which has 31 visible houses and a church with a square tower and not a spire.
     4. There is an old plastic bag from Asda in the hedge, and a squashed Coca-Cola can with a snail on, and a long piece of orange string.
     5. The north-east corner of the field is highest and the south-west corner is lowest [...] and the field is folded downwards slightly along the line between these two corners so that the north-west and south-east corners are slightly lower than they would be if the field was a flat inclined plane.
     6. I can see three different types of grass and two colours of flowers in the grass.

     And there were 31 more things in this list of things [...] And when I am in a new place, because I see everything, it is like when a computer is doing too many things at the same time and the central processor unit is blocked up and there isn't any space left to think about other things.

It has been pointed out many times on the IF newsgroups that to completely implement a single real room would take forever. Look at the room you're in. Chances are it has thousands of objects in it. Imagine having to write a description of every single one of those objects and its relationship to every other. Eeeagh! Instead, you winnow it down to the objects you'll actually need, plus a bit of scenery. In other words, the author does for the player what the autistic person is incapable of doing for himself. No wonder there seems to be a disproportionate number of autistic-spectrum folk in IF fandom: it must be wonderful to wander around a virtual world where surroundings can be completely apprehended without being overwhelming (which isn't guaranteed even for graphical adventures).

Then throw in the fact that, yes, other characters generally don't speak unless spoken to, and when they do speak, stay on point. They don't make small talk, don't look at you expectantly, and in the very rare cases that their facial expressions are important, those expressions are translated into words. Throw in the fact that there are usually clear goals, the fact that everything operates according to a set of rules that can be deduced, and that those rules can be synthesized into a strategy for achieving those goals. So it's not just that the characters in IF appear to be autistic — it's that the medium is geared towards the preferences of the autist. Christopher Boone would love this stuff.

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