21. Therefore, naturally occurring elevations of cortisol during periods of stress lead to impairment of declarative memory . 22. For instance Ellenbogen, et al . argue that sleep actively protects declarative memory from associative interference. 23. For instance Ellenbogen, et al . argues that sleep actively protects declarative memory from associative interference. 24. The early-night test group performed 16 % better on the declarative memory test than the control group. 25. It is believed by many researchers that sleep plays an active role in consolidation of declarative memory . 26. Molaison's declarative memory was not functioning, as was seen when Molaison completed the task of repetition priming. 27. Declarative memory uses your medial temporal lobe and enables you to recall the telephone number at will.28. Patient R . B . was another clinical case reinforcing the role of the hippocampus in declarative memory . 29. This in turn indicated that SWS is associated with poor declarative memory consolidation but not with age itself. 30. Children that have experienced child abuse may according to neuropsychological testing experience a deficit in verbal declarative memory functioning.