Long term memory lasts for longer periods (even for life time) and can hold much more information than the short term memory. The two types of long term memory are,
• Declarative or explicit memory
• Implicit or non-declarative memory
Karl Lashley searched for explicit memory in animal models using the tests used for implicit memory.
Milner studied a patient with the removal of medial temporal lobe. He used tests, which are used for both the explicit and implicit memories. .