Stimulus over-selectivity in rats.
Rats can show the same narrow attention seen in autism, giving us a quick lab tool for testing fixes.
01Research in Context
What this study did
Gibson et al. (2005) worked with rats in a lab.
They wanted to see if rats could show stimulus over-selectivity.
This is the same narrow focus seen in many kids with autism.
What they found
The rats did show over-selectivity.
They locked onto one cue and ignored the others.
This gives us a simple animal model for studying the symptom.
How this fits with other research
Reed et al. (2009) took the idea further. They showed that higher-functioning children with ASD can reverse over-selectivity when the over-selected cue is put on extinction.
Nakagawa (2005) used the same rat setup but looked at emergent relations instead. Both papers prove rats can teach us about stimulus control.
Gunter et al. (2022) moved the animal model idea to monkeys. They linked social behavior to autism-risk genes, showing animal models keep growing.
Why it matters
You now have a cheap, fast way to test why over-selectivity happens.
Try rat-tested procedures first before using them with kids.
If extinction works in rats, it may work in higher-functioning learners.
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02At a glance
03Original abstract
The present study explored whether a similar phenomenon to stimulus over-selectivity occurred in rats, in the hope of establishing a non-human model for the autism. Rats were serially presented with two-15 seconds, two-element compound stimuli prior to the delivery of food, in an appetitive classical conditioning procedure. Each compound stimulus consisted of two lights. Once the rats had acquired a conditioned response (CR) to the stimuli, they were presented with each of the component elements separately in extinction. The rats demonstrated greater conditioning to components of the compound presented just prior to reinforcement than to the components of the temporally distant compound. However, there was a smaller difference between CRs to the components of the compound presented just prior to reinforcement (i.e. less overshadowing) than between the components of the temporally distant compound. It is suggested that rats demonstrated a form of stimulus over-selectivity, resulting in greater overshadowing of one cue by another. Such results may form the basis of a viable non-human model of this symptom of autistic spectrum disorder.
Journal of autism and developmental disorders, 2005 · doi:10.1007/s10803-005-0030-9