Fluid reasoning (or ‘fluid intelligence’) is the ability to apply knowledge to new situations; as opposed to ‘rote memory’, which is simply repeating the same memorised steps over and over. A deficit in fluid intelligence is one symptom of an autism spectrum disorder like Aspergers or NLD. Researchers have found that a simple computer game called ‘n-back‘ can help improve fluid intelligence, as this Wired article explains (but so far, they’ve only tested it on non-autistic subjects). A free version of the game can be downloaded here (the usual disclaimer: though I’ve downloaded and used it myself, I make no claims as to the fitness of this software for any purpose, or that it won’t damage your computer, cause it to melt, disappear into thin air or eat your lunch when you’re not looking). Versions of the game are also available for mobile devices, search ‘n-back’ for more details.