I restarted services.
I sent the test spam "/usr/share/doc/spamassassin-2.44/sample-spam.txt" and added "braintmr" in the subject line (with out the quotes) and it was still tagged as spam.
header
Brain_TMR Subject =~ /braintmr/i
describe Brain_TMR Allow if subject contains keyword braintmr
score Brain_TMR -90.0
describe Brain_TMR Allow if subject contains keyword braintmr
score Brain_TMR -90.0