Teacher2Teacher 
Q&A #1154 
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From: Harry Erwin, PhD <herwin@theworld.com> To: Teacher2Teacher Public Discussion Date: 2004110904:00:27 Subject: Re: Front end estimation Estimation and exact calculation are performed by different parts of the brain. See Sohn et al., 2004, "Behavioral equivalence, but not neural equivalenceneural evidence of alternative strategies in mathematical thinking," Nature Neuroscience, 7(11):11931194, November 2004. The prefrontal cortex is activated more strongly when exact calculation is required, while the parietal cortex activates more strongly for approximation. This implies the skills should be taught separately at ageappropriate times. (Age appropriateness here is early enough to contribute positively to the development of the areanot so late that the skills are hard to learn due to loss of plasticity, but not so early that the neural circuits haven't yet formed.)
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