Masako Okawa

11.0k total citations · 1 hit paper
150 papers, 7.7k citations indexed

About

Masako Okawa is a scholar working on Experimental and Cognitive Psychology, Endocrine and Autonomic Systems and Cognitive Neuroscience. According to data from OpenAlex, Masako Okawa has authored 150 papers receiving a total of 7.7k indexed citations (citations by other indexed papers that have themselves been cited), including 67 papers in Experimental and Cognitive Psychology, 64 papers in Endocrine and Autonomic Systems and 62 papers in Cognitive Neuroscience. Recurrent topics in Masako Okawa's work include Sleep and related disorders (61 papers), Sleep and Wakefulness Research (58 papers) and Circadian rhythm and melatonin (53 papers). Masako Okawa is often cited by papers focused on Sleep and related disorders (61 papers), Sleep and Wakefulness Research (58 papers) and Circadian rhythm and melatonin (53 papers). Masako Okawa collaborates with scholars based in Japan, United States and China. Masako Okawa's co-authors include Makoto Uchiyama, Kayo Shibui, Xianchen Liu, Kazuo Mishima, Yasuo Hishikawa, Masumi Minowa, Yuriko Doi, Keiko Kim, Yuichi Kamei and Makoto Uchiyama and has published in prestigious journals such as Proceedings of the National Academy of Sciences, Journal of Neuroscience and Nature Cell Biology.

In The Last Decade

Masako Okawa

148 papers receiving 7.4k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Psychometric assessment of subjective sleep quality using the Japanese version of the Pittsburgh Sleep Quality Index (PSQI-J) in psychiatric disordered and control subjects

2000 747 citations Yuriko Doi, Masumi Minowa et al. Psychiatry Research profile →

Peers

Countries citing papers authored by Masako Okawa

Since Specialization

Citations

This map shows the geographic impact of Masako Okawa's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Masako Okawa with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Masako Okawa more than expected).

Fields of papers citing papers by Masako Okawa

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Masako Okawa. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Masako Okawa. The network helps show where Masako Okawa may publish in the future.

Co-authorship network of co-authors of Masako Okawa

This figure shows the co-authorship network connecting the top 25 collaborators of Masako Okawa. A scholar is included among the top collaborators of Masako Okawa based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Masako Okawa. Masako Okawa is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

#	Work	Indexed citations
1	Schizophrenic patients have a preference for symmetrical rectangles: A comparison with preferences of university students 2008 ·International Journal of Psychiatry in Clinical Practice ·Yumi Iwamitsu, (unknown), Mizuho Konishi, (unknown), Masako Okawa, Naoto Yamada	1
2	A preliminary study on the influence of obstructive sleep apnea upon cumulative parasympathetic system activity 2008 ·Auris Nasus Larynx ·R Tabata, Min Yin, Meiho Nakayama, (unknown), T. Hata, Yutaka Shibata, Yoshiaki Itasaka, Kazuo Ishikawa, Masako Okawa, Soichiro Miyazaki	5
3	Circadian rhythm sleep disorders: Characteristics and entrainment pathology in delayed sleep phase and non-24 sleep–wake syndrome 2007 ·Sleep Medicine Reviews ·Masako Okawa, Makoto Uchiyama	81
4	The impact of CYP2D6 genotypes on the plasma concentration of paroxetine in Japanese psychiatric patients 2006 ·Progress in Neuro-Psychopharmacology and Biological Psychiatry ·(unknown), Genta Hirokane, Sachiyo Morita, Masako Okawa, Takashi Watanabe, Kazufumi Akiyama, Kazutaka Shimoda	30
5	Cerebral white matter blood flow is constant during human non-rapid eye movement sleep: a positron emission tomographic study 2004 ·Journal of Applied Physiology ·Masahiko Hiroki, Takeshi Uema, Naofumi Kajimura, Kenichi Ogawa, Masami Nishikawa, Masaaki Kato, Tsuyoshi Watanabe, Toru Nakajima, Harumasa Takano, Etsuko Imabayashi, Takashi Ohnishi, Yutaka Takayama, Hiroshi Matsuda, Makoto Uchiyama, Masako Okawa, Kiyohisa Takahashi, Hidenao Fukuyama	12
6	The Relationship between Inhibition of Negative Emotion in Breast Cancer Patients and Emotional Distress after Diagnosis 2002 ·Yumi Iwamitsu, Kazutaka Shimoda, Hajime Abe, Toru Tani, Masako Okawa	5
7	Somatic and Psychological Complaints and Their Correlates With Insomnia in the Japanese General Population 2001 ·Psychosomatic Medicine ·(unknown), Makoto Uchiyama, Xianchen Liu, Kayo Shibui, Takashi Ohida, Ryuji Ogihara, Masako Okawa	60
8	Menstrual changes in sleep, rectal temperature and melatonin rhythms in a subject with premenstrual syndrome 2000 ·Neuroscience Letters ·Kazuyuki Shinohara, Makoto Uchiyama, Masako Okawa, Kimihiko Saito, Maiko Kawaguchi, Toshiya Funabashi, Fukuko Kimura	17
9	Sleep loss and daytime sleepiness in the general adult population of Japan 2000 ·Psychiatry Research ·Xianchen Liu, Makoto Uchiyama, Keiko Kim, Masako Okawa, Kayo Shibui, Yoshihisa Kudo, Yuriko Doi, Masumi Minowa, Ryuji Ogihara	207
10	Genetic polymorphisms of human melatonin 1b receptor gene in circadian rhythm sleep disorders and controls 2000 ·Neuroscience Letters ·Takashi Ebisawa, Makoto Uchiyama, Naofumi Kajimura, Yuichi Kamei, Kayo Shibui, (unknown), (unknown), Toshio Iwase, Mariko Sugishita, (unknown), Masaaki Ikeda, Yuji Ozeki, (unknown), Masanori Sekimoto, Masaaki Katoh, Naoto Yamada, Ryoichi Toyoshima, Masako Okawa, Kiyohisa Takahashi, Toshio Yamauchi	31
11	Attaining Nocturnal Urinary Control, Nocturnal Enuresis, and Behavioral Problems in Chinese Children Aged 6 Through 16 Years 2000 ·Journal of the American Academy of Child & Adolescent Psychiatry ·Xianchen Liu, Zhenxiao Sun, Makoto Uchiyama, Yan Li, Masako Okawa	73
12	Melatonin Rhythms in Delayed Sleep Phase Syndrome 1999 ·Journal of Biological Rhythms ·Kayo Shibui, Makoto Uchiyama, Masako Okawa	87
13	Development of the Pittsburgh Sleep Quality Index Japanese version. 1998 ·(unknown), Masumi Minowa, Makoto Uchiyama, Masako Okawa	91
14	Randomized, DIM Light Controlled, Crossover test of Morning Bright Light Therapy for Rest-Activity Rhythm Disorders in Patients with Vascular Dementia and Dementia of Alzheimer's type 1998 ·Chronobiology International ·Kazuo Mishima, Yasuo Hishikawa, Masako Okawa	97
15	A multicenter study of sleep‐wake rhythm disorders: Clinical features of sleep‐wake rhythm disorders 1996 ·Psychiatry and Clinical Neurosciences ·(unknown), Kiyohisa Takahashi, Masako Okawa	30
16	Morning bright light therapy for sleep and behavior disorders in elderly patients with dementia 1994 ·Acta Psychiatrica Scandinavica ·Kazuo Mishima, Masako Okawa, Yasuo Hishikawa, Satoshi Hozumi, Hiroaki Hori, Keiichi Takahashi	276
17	Circadian Rhythm Disorders in Sleep-Waking and Body Temperature in Elderly Patients with Dementia and Their Treatment 1991 ·SLEEP ·Masako Okawa, Kazuo Mishima, Yasuo Hishikawa, Satoshi Hozumi, Hiroaki Hori, Keiichi Takahashi	151
18	Respiratory disturbance during sleep due to adenoid-tonsillar hypertrophy 1989 ·American Journal of Otolaryngology ·Soichiro Miyazaki, Yoshiaki Itasaka, Kōji Yamakawa, Masako Okawa, Kiyoshi Togawa	24
19	Obstructive Sleep Dyspnea: Diagnosis and treatment 1988 ·Acta Oto-Laryngologica ·Kiyoshi Togawa, Akiyoshi Konno, Soichiro Miyazaki, Kōji Yamakawa, Masako Okawa	2
20	[Psychiatric symptoms of ruptured anterior communicating aneurysms and social prognosis (author's transl)]. 1978 ·Munich Personal RePEc Archive (Ludwig Maximilian University of Munich) ·(unknown), Masako Okawa, (unknown), (unknown)	1

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact