CAPT OF AN LTT TURNED THE OPPOSITE WAY WHEN TAXIING OUT FOR TKOF.

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WE WERE CLRED TO TAXI VIA TXWYS N AND T TO RWY 36R. AFTER WE GOT UNDER WAY; I CALLED FOR THE TAXI CHK. SHORTLY AFTER IT WAS COMPLETED I CAME TO THE INTXN OF TXWYS T AND C. I SHOULD HAVE TURNED R TO GET TO RWY 36R BUT INSTEAD; I TURNED L. FOR THE PAST WK AND A HALF WE HAD TAKEN THIS RTE TO RWY 18L. EVEN THOUGH I HAD HEARD AND UNDERSTOOD THE CLRNC; I BY FORCE OR HABIT; TURNED THE WRONG WAY. SHORTLY AFTER I MADE THE TURN; GND SAID 'MAKE A 180 DEG AND TAXI TO RWY 36R.' I REALIZED MY ERROR AND STARTED THE TURN. AT THIS POINT; MY FO ASKED ME WHAT WAS GOING ON. HE HADN'T SEEN THE WRONG TURN OR EVEN HEARD GND'S XMISSION TO US. I HADN'T REALIZED IT; BUT IMMEDIATELY AFTER COMPLETION OF THE TAXI CHK; HE HAD DIVERTED HIS ATTN TO TRYING TO GET THE RNAV SYS TO INITIALIZE SO; HE HAD HIS HEAD DOWN AND WASN'T PAYING ATTN TO ATC XMISSIONS. I AM A NEW CAPT WITH 50 HRS PIC IN THE AIRPLANE; INCLUDING THE TYPE RIDE AND IOE. I'M STILL LEARNING HOW TO DO THE JOB EFFECTIVELY AND HOW BEST TO EXERCISE MY COMMAND AUTH. OBVIOUSLY; I DIDN'T DO A VERY GOOD JOB OF IT THAT NIGHT.