Table 1.

Productions for the modified digit span task model

READ-ALOUD

IF the goal is to articulate

and a character is in vision

and the character has not been articulated

THEN say the name of the character

and note that it has been articulated

CREATE-MEMORY

IF the goal is to articulate

and the current character is a digit (i.e., the last character of the string)

and it has already been articulated

THEN create a memory of that character in the current position of the current trial

and increment to the next position

and set a flag to rehearse the first position

REHEARSE-MEMORY

IF the goal is to articulate

and the current character in vision has been articulated

and the rehearsal flag is set to rehearse the memory item in a certain position

and there is a memory of an item in that position

THEN rehearse the item

and increment the rehearsal flag to the next position

PARSE-SCREEN

IF the goal is to articulate on the current trial

and there are recall instructions on the screen

THEN change the goal to recall the first position of the current trial

RECALL-SPAN

IF the goal is to recall a position on the current trial

and there is a memory of an item in that position on this trial

and the item has not been recalled already

THEN recall the item

and increment the recall position to the next position

NO-RECALL

IF the goal is to recall

and there's no memory of an item in the current position

THEN recall blank

and increment the recall position to the next position