Table 3.

Proportion Correct Responses in the fMRI Working Memory Tasks for Patients with Kleine-Levin Syndrome and Healthy Controls

Difficulty Level	KLS			Controls
	Previously Studied		New	Previously Studied		New
	Correct Sentences	Incorrect Sentences		Correct Sentences	Incorrect Sentences
One Item	0.94 (0.05)	1.0 (0.01)	0.99 (0.01)	0.96 (0.04)	1.0 (0.01)	0.98 (0.01)
Two Items	0.83 (0.03)	0.83 (0.04)	0.97 (0.01)	0.96 (0.02)	0.96 (0.03)	1.00 (0.01)
Three Items	0.94 (0.03)	1.0 (0.04)	1.00 (0.01)	0.98 (0.02)	0.93 (0.03)	1.00 (0.01)
Four Items	0.91 (0.04)	0.86 (0.04)	0.99 (0.01)	0.96 (0.03)	0.96 (0.03)	0.96 (0.01)

Performance is expressed as a function of level of difficulty (i.e., the number of words to be stored before responses were probed) and semantic correctness of sentences containing to-be-remembered words.