Which is a lot of big words. Basically, if I am correct, the researchers think that particular circuits in the brain are working overtime reacting strongly to input and remembering its reactions to inform future preferences. That is a very basic summary: really, you're better off reading it from the source above.
The researchers describe four areas of effects of the hyper-functioning microcircuits which impact how people with autism experience the world: hyper-perception, hyper-attention, hyper-memory and hyper-emotionality.
Hyper-perception
Various circuits (differing from person to person, hence the very individual expresssions of ASC) have a loss of inhibition and are therefore hyper-reactive, leading to "vulnerability to sensory overflow. Consequential behaviour would be panic, aggression and withdrawal."
Hyper-attention
This sounds as though the brain gets 'locked into' a circuit, where a circuit is activated and then continues to reverberate, or repeat itself and is difficult to interrupt. This brain activity is clearly linked to difficulties in transition and shifting attention for people with autism, and to fixated attention on matters of interest. Also, autistic people "may seem distracted and disengaged, but are actually hyper-focussed on internal processes."
Hyper-memory
Here it is proposed that early learning is strongly imprinted and not easily over-written. Once something has been learnt it is very hard to unlearn, explaining why people with autism find it very difficult to address problems or tasks in a new way. Also, there may be displayed "idiosyncratic, albeit exceptional memory capabilities."
Hyper-emotionality
Quite contrary to many previous models of autism, the Intense World Theory suggests that in autism there is actually an enhanced sympathetic response to social content as well as to novel or sensory rich content and negatively associated stimuli. This is thought to lead to enhanced fear conditioning and avoidance of high-emotion stimuli (eg. eye contact) as well as avoidance of novel environments "due to fear of surprises that arise from over-generalisation of previous negative associations." Behaviours displayed may seem unpredictable, exaggerated, extreme or inappropriate.
The writers conclude that:
"In contrast to other deficit-oriented theories of autism, the Intense World Theory points out that enhanced brain functioning may lie at the heart of autism. In this light, autistic individuals may in general – and not only in exceptional cases – exhibit enhanced perception, attention, and memory capabilities and it is in fact these capabilities, which may turn the world too intense and even aversive and lead to many of the autistic symptoms including withdrawal and social avoidance".Obviously this is a painfully tiny summary, and quite possibly not a perfectly true representation of the research, so please go and do some further reading and come back with questions! The theory is still fairly controversial I think, but there are parts of it that seem to make a lot of sense to me.
I would say the reason I avoid emotional stimuli is definitely due to being overly sensitive, getting overwhelmed by people's insides and not knowing what I am supposed to do with that stuff or how I can make someone feel better or show them I am happy with them. Hyper-memory I think also affects me quite strongly: I tend to be pretty rigid in my approach to many things (probably much to the frustration of Mr Peggy!), to the extent that I feel like I am doing something wrong if I deviate from my own expectations. The other two areas also add up with my and many others' experiences, so if you would like any more information/anecdotes/thoughts on any particular areas, just let me know!
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