that is what we're calling an "indica". its possible your cerebral cortex doesn't respond to "sativas".
when i smoke an indica, i can't get anything done because of the couchlock and foggy happy feeling. when i smoke a sativa or sativa dominant hybrid i can code for 12 hours straight. i can garden for hours with an indica and some M-150s.
the difference is what part of your brain is affected. an indica will hit your nervous system, a sativa will activate dopamine in your cerebral cortex. that's how i understand it. maybe your cerebral is always activated, or its unaffected by thc.
my thoughts on your conundrum :D
EDIT: ps i've learned not to operate power tools or chainsaws on an indica XD
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