Masaaki Kato

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STUDY OBJECTIVES The objective of this study was to clarify sleep characteristics and pathophysiology in patients with delayed sleep phase syndrome (DSPS), which is a major circadian rhythm sleep disorder subtype. DESIGN Polysomnography was performed for 2 consecutive nights and core body temperature was sampled for 7 consecutive days, including the(More)
Persons with epilepsy experience déjà vu phenomena with or without seizure recognition. Déjà vu experiences are also common mental phenomena in nonclinical individuals. The purpose of this study was to clarify two forms of déjà vu experiences in persons with epilepsy. Déjà vu experiences of 312 patients with epilepsy and 402 nonclinical individuals were(More)
We studied 11 patients (9 males) with cytogenetic diagnosis of fragile X syndrome (FXS) with the purpose of investigating the neural circuitry involved in this condition. The ages ranged from 8 to 19. All the individuals presented large ears, elongated faces and autistic features. Ten patients had severe mental retardation. Attention disorder was found in(More)
OBJECTIVE The current study attempts to define the psychological features of patients with delayed sleep-phase syndrome (DSPS). METHOD We administered the Yatabe-Guilford test (Y-G test), Minnesota Multiphasic Personality Inventory (MMPI), Picture-Frustration study (P-F study) and Rorschach test to two groups, one of patients with DSPS (case group) and(More)
PURPOSE To evaluate further the relevance of designating psychotic episodes as either postictal or interictal, we compared several biologic variables between epilepsy patients with and without psychosis. METHODS The study subjects comprised 282 patients with psychosis (36 with postictal psychosis, 224 with interictal psychosis, and 22 with both postictal(More)
PURPOSE Status epilepticus (SE) appears to cause cognitive dysfunction as well as other serious neurologic sequelae. To confirm whether SE produces a subsequent intellectual decline, we evaluated intellectual function prospectively in adult epilepsy patients with and without SE. METHODS Of 1,685 patients with epilepsy who underwent comprehensive(More)
Delta wave deficits during sleep have been observed in patients with schizophrenia. Decreased slow-wave sleep is reported to be associated with negative symptoms. Frontal lobe dysfunction is also believed to underlie negative symptoms of schizophrenia. This study was designed to identify functional abnormalities in schizophrenia manifested on patients'(More)
The nature of post-ictal headache (PIH) remains unclear. A multicenter study was conducted in order to evaluate frequency and risk factors for PIH. The subjects consisted of 97 patients with temporal lobe epilepsy (TLE), 65 patients with frontal lobe epilepsy (FLE) and 37 patients with occipital lobe epilepsy (OLE). The subjects were asked about PIH at each(More)
PURPOSE To ascertain whether bimodal psychosis (i.e., independent postictal and interictal psychosis) in patients with epilepsy can be characterized by postictal psychosis that develops after interictal psychosis remits. METHODS We reviewed the records of 14 patients with bimodal psychosis treated at a national center hospital. Clinical and(More)
The authors investigated the frequency and correlates of déjà vu experiences in 386 healthy adult volunteers recruited from several areas in Japan. Déjà vu experiences and related experiences were evaluated using the Inventory of Déjà vu Experiences Assessment. Déjà vu experiences were observed by 294 (76.2%) of the 386 participants. Persons who experienced(More)