TASK; PRESENT SOME TBR MATERIAL IN SEQUENCE TEST FOR MEMORY
SCORE MEMORY AS A FUNCTION OF INPUT SERIAL ORDER
FIND:

MOST RECENTLY PRESENTED ITEMS RECALLED FROM SIM
EARLIER ITEMS RECALLED FROM LTM

CAN THIS BE "SHOWN": LOGIC OF A DOUBLE DISSOCIATION

WHAT IS A DOUBLE DISSOCIATION:
TO ARGUE FOR TWO SEPARATE PROCESSES (OR STRUCTURES) ONE WANTS TO FIND SOME CONDITION THAT HELPS OR HINDERS A (IN THIS CASE STM) BUT NOT BE (IN THIS CASE LTM) AND A SECOND CONDITION THAT SHOWS THE OPPOSITE: HELPS OR HURTS B WITH NO EFFECT ON A
WHAT VARIABLE IS KNOWN TO IMPEDE MOVEMENT FROM STM TO LTM (hint: BROWN-PETERSONS TASK)

WHAT VARIABLE IS KNOWN TO HAVE NO INFLUENCE ON STM BUT DOES LTM (hint: PROBE DIGIT TASK)

NOTE WHAT WE HAVE DISCUSSED:
1. WE SEEM TO HAVE A LIMITED CAPACITY TO KEEP INFORMATION IN CONSCIOUSNESS, AND TO "WORK" WITH IT
(EG., SOME INSTANCES OF WORK ARE: REHEARSAL, MENTAL ROTATION ETC)

2. THE MODAL MODEL SEEMS INADEQUATE IN AS MUCH AS IT EMPHASIZES;
-SOUND-BASED ENCODING (NOTE EVIDENCE FOR BOTH VISUAL AND SEMANTIC EFFECTS IN STM)
-ROLE OF REHEARSAL IN TRANSFERRING INFORMATION TO LTM (AND THE ASSUMPTION THAT STM IS MAINLY A HOLDING TANK WHERE MAINTENANCE REHEARSAL GOES ON)
-THE INTERACTIONS BETWEEN STM AND LTM THAT MUST OCCUR FOR CHUNKING (AND SIMILAR KNOWLEDGE-BASED PHENOMENA) TO OCCUR
3. IS STM (AS DESCRIBED IN THE MODAL MODEL) ECOLOGICALLY RELEVANT???

CONSIDER A PATIENT: WHEN TESTED HAS AN IMMEDIATE MEMORY SPAN (IMS) OF ONLY 2 CHUNKS (COMPARE TO THE 7 PLUS OR MINUS 2 FOUND IN THE AVERAGE PERSON)

NOW IF STM WAS ESSENTIAL TO ACCESSING INFORMATION IN LTM, AND TO COGNITVE PROCESSING, THIS PERSON SHOULD BE SEVERELY IMPAIRED...
BUT, IN FACT, ON COMPREHENSION OTHER TESTS, THIS IS NOT THE CASE...THE PERSON SCORED IN THE NORMAL RANGE