NeuroMetrix ( NURO) slumped after it was downgraded by Sun Trust Robinson Humphrey. The firm cut its rating on the stock to neutral from buy, pushing the stock down 8.3% to $15.90. Immunicon ( IMMC) fell after it agreed to sell $30 million of unsecured subordinated convertible promissory notes. The stock was down 7.9% to $3.16. Ameriana Bancorp ( ASBI) was weaker after its board slashed its quarterly cash dividend to 4 cents a share. The dividend is payable on Jan. 5 to shareholders of record Dec. 15. The company last paid a quarterly dividend of 16 cents. Ameriana was off 7.6% to $12.61.