Saul Sternberg's Memory Scanning Experiments

Saul Sternberg’s Memory Scanning Experiments
On each trial, subjects are first visually presented a
memory set of from 1 to 6 digits one at a time for about
a second each. After a 2-sec delay, there is a warning
signal and then a single test digit is presented. Subject
presses one button if the test digit was in the memory
set, the other button if not.
Parallel search (unlimited capacity)
Parallel search (limited capacity)
Serial search