Duration for LTM and STM studies

Duration of Short term memory (STM) and long term memory (LTM)

duration refers to how long a memory lasts before it is no longer available.

duration of STM is measured in--seconds and minutes

                                                   LTM--hours and years.

Duration of LTM:

Shepard (1967)

• tested duration of LTM. He showed participants 612 memorable pictures, one at a time.
• one hour later they were shown some of these pictures among a set of new pictures and showed perfect recognition.

4 months later they could still remember 50% of the photo's.

Bahrick (1975)

• asked people of various ages to put names to faces from old yearbooks…