AN LTT CREW DIDN'T ADHERE TO THEIR TAXI CLRNC AT MEM; INSTEAD THEY PROCEEDED AS IN THE PAST.

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ANTICIPATED 'NORMAL' TAXI INSTRUCTIONS DURING MY CLRING OF THE LNDG RWY. HOWEVER; I DID NOT 'HEAR' THE CTLR'S ACTUAL INSTRUCTIONS; AND PROCEEDED ON THE TAXI ROUTING I'VE BEEN GIVEN REPEATEDLY OVER THE LAST FEW YRS. WRONGLY REVERTED TO A HABIT PATTERN INSTEAD OF LISTENING TO WHAT THE CTLR WAS ACTUALLY SAYING. TWR DID NOT MONITOR MY TAXI PROGRESS AFTER I CAME OFF THE HIGH SPD TXWY. DID NOT ANTICIPATE THE ACFT MISSING/PASSING THE ASSIGNED TXWY (TXWY S). LANDED ON RWY 18L AT MEM. ROLLED OFF AT THE HIGH SPD TXWY; AS 'NORMAL;' AND CONTINUED TOWARDS TXWY E WHILE FO RECEIVED INSTRUCTIONS FROM TWR TO 'TURN R AT TXWY S; HOLD SHORT OF TXWY P.' I DID NOT ACTUALLY HEAR THE INSTRUCTIONS AND ASKED THE FO WHAT TWR'S TAXI INSTRUCTIONS WERE. I ASSUMED TXWY S; WHICH I HAD NEVER USED; WAS ON THE W SIDE OF RWY 18C. IN FACT; BY THIS TIME; IT WAS ACTUALLY BEHIND ME AS I WAS TAXIING WBOUND ON TXWY E. WE CROSSED RWY 18C; ANTICIPATING THAT TXWY S WAS 1 OF THE 2 UPCOMING TXWYS THAT WE WOULD TURN R ONTO. SINCE WE HAD NOT RECEIVED A 'HOLD SHORT OF RWY 18C' CALL; AND WE WERE STILL IN CONTACT (AS ASSIGNED) TO TWR; XING THE RWY DID NOT SEEM UNUSUAL; AFTER PARKING AT THE TERMINAL; I RECEIVED WORD TO CALL THE TWR SUPVR; WHO TOLD ME THAT BECAUSE A GA ACFT HAD BEEN CLRED FOR TKOF ON RWY 18C WHILE I WAS XING IT; A RWY INCURSION INCIDENT HAD OCCURRED. SUPPLEMENTAL INFO FROM ACN 513467: AT THAT TIME TWR ISSUED US TAXI INSTRUCTIONS. I REPEATED THE TAXI INSTRUCTIONS TO THE TWR; AND ALSO TO THE CAPT WHO ASKED TO HAVE THE INSTRUCTIONS VERIFIED. THE CAPT THEN INSTRUCTED ME TO START THE AFTER LNDG CHKLIST. AT THE SAME TIME HE TAXIED ONTO TXWY E WBOUND. I HAD NO REASON TO BELIEVE THE CAPT WAS UNCLR WITH THE TAXI INSTRUCTIONS AND THOUGHT HE WAS COMPLYING WITH THE TWR TAXI INSTRUCTIONS.