Short-term memory is believed to rely mostly on an acoustic code for storing information, and to a lesser extent a visual code. Conrad (1964) found that test subjects had more difficulty recalling collections of letters that were acoustically similar (e.g. E, P, D)<answer>. Confusion with recalling acoustically similar letters rather than visually similar letters implies that the letters were encoded acoustically.</answer> Conrad's (1964) study, however, deals with the encoding of written text; thus, while memory of written language may rely on acoustic components, generalisations to all forms of memory cannot be made.
What does Conrads finding seem to mean?
. Confusion with recalling acoustically similar letters rather than visually similar letters implies that the letters were encoded acoustically.