STM not exclusively acoustic
eg - ppts used visual coding in STM if given a visual task and prevented from doing any verbal rehearsal in the retention interval before performing a visual recall task.
This shows ppt used visual codes - STM doesn't just rely on acoustic codes for storing information.
LTM not exclusively semantic
eg long term recall was related to visual aswell as semantic categories.
Other research found evidence of acoustic coding in LTM. This shows coding is not just semantic.
