Table :
Table 5.1
Durations and Capacities of the Three Memory Stages
Memory Stage
Duration
Capacity
Sensory memory
<1 sec for iconic memory;
4–
5 secs for echoic memory
Large
Shor
t-
term memory
Up to 30 secs without rehearsal
7 ± 2 chunks
Lon
g-
term memory
A long time (perhaps permanently)
Essentially unlimited