Short-term memory and long-term memory are still different.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Memory Research

Background:

• A prevailing theory suggests short-term memory (STM) is equivalent to activated long-term memory (LTM).
• This view challenges the established cognitive psychology principle of distinct short- and long-term memory stores.

Purpose of the Study:

• To present a case for functionally and neurobiologically distinct short- and long-term memory stores.
• To examine the computational requirements of STM, arguing they cannot be met by LTM activation alone.

Main Methods:

• Theoretical analysis of computational demands on STM systems.
• Review of neuroimaging data presented as evidence for the activated LTM model.
• Argumentation based on memory for novel information, multiple tokens, and variable binding.

Main Results:

• STM requires capabilities beyond simple LTM activation, such as handling novel information and binding variables.
• Storing sequences with repeated elements (e.g., '1, 3, 1') highlights limitations of LTM activation for ordered recall.
• Existing neuroimaging data are consistent with a two-store memory model, not solely activated LTM.

Conclusions:

• Evidence supports a distinct separation between short-term and long-term memory stores.
• The computational demands of STM necessitate a system beyond mere activation of long-term memory.
• A conventional two-store model adequately explains current empirical findings.