Masaaki Hirayama

9.4k total citations · 2 hit papers
193 papers, 6.6k citations indexed

About

Masaaki Hirayama is a scholar working on Neurology, Cellular and Molecular Neuroscience and Surgery. According to data from OpenAlex, Masaaki Hirayama has authored 193 papers receiving a total of 6.6k indexed citations (citations by other indexed papers that have themselves been cited), including 90 papers in Neurology, 36 papers in Cellular and Molecular Neuroscience and 31 papers in Surgery. Recurrent topics in Masaaki Hirayama's work include Parkinson's Disease Mechanisms and Treatments (59 papers), Neurological disorders and treatments (30 papers) and Genetic Neurodegenerative Diseases (23 papers). Masaaki Hirayama is often cited by papers focused on Parkinson's Disease Mechanisms and Treatments (59 papers), Neurological disorders and treatments (30 papers) and Genetic Neurodegenerative Diseases (23 papers). Masaaki Hirayama collaborates with scholars based in Japan, United States and Slovakia. Masaaki Hirayama's co-authors include Gen Sobue, Kinji Ohno, Hirohisa Watanabe, Mikako Ito, Masahisa Katsuno, Haruki Koike, Tomohiko Nakamura, Eiichiro Mukai, Tetsuya Maeda and Tomomi Minato and has published in prestigious journals such as Nature, The Lancet and Journal of Biological Chemistry.

In The Last Decade

Masaaki Hirayama

191 papers receiving 6.5k 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.

Intestinal Dysbiosis and Lowered Serum Lipopolysaccharide-Binding Protein in Parkinson’s Disease

2015 387 citations Satoru Hasegawa, Hirokazu Tsuji et al. PLoS ONE profile →
Meta‐Analysis of Gut Dysbiosis in Parkinson's Disease

2020 270 citations Hiroshi Nishiwaki, Mikako Ito et al. Movement Disorders profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Masaaki Hirayama Japan	41	3.1k	1.8k	1.5k	1.4k	1.0k	193	6.6k
Saburo Sakoda Japan	46	2.1k 0.7×	2.8k 1.5×	1.0k 0.7×	1.3k 0.9×	312 0.3×	254	7.9k
Peter Blumbergs Australia	48	3.7k 1.2×	2.4k 1.3×	1.2k 0.8×	1.5k 1.1×	870 0.9×	231	8.8k
Kinji Ohno Japan	62	3.8k 1.2×	7.5k 4.2×	1.7k 1.1×	1.5k 1.0×	1.6k 1.6×	345	12.6k
Michel Neunlist France	53	2.3k 0.7×	2.7k 1.5×	1.7k 1.1×	1.2k 0.8×	2.6k 2.6×	213	10.1k
Robert Sufit United States	32	4.1k 1.3×	1.7k 0.9×	946 0.6×	861 0.6×	902 0.9×	93	6.9k
Pascal Derkinderen France	47	3.2k 1.0×	1.9k 1.1×	1.4k 0.9×	1.5k 1.1×	717 0.7×	142	7.0k
Nikolaos Grigoriadis Greece	43	1.1k 0.4×	1.9k 1.1×	1.2k 0.8×	1.0k 0.7×	463 0.5×	221	7.0k
Yoshio Tsuboi Japan	42	3.8k 1.2×	1.6k 0.9×	1.5k 1.0×	1.2k 0.8×	289 0.3×	292	6.5k
Jan M. Schwab Germany	48	1.0k 0.3×	1.9k 1.0×	615 0.4×	1.7k 1.2×	989 1.0×	125	7.9k
Gabriele Siciliano Italy	52	2.6k 0.8×	4.6k 2.6×	2.2k 1.5×	2.3k 1.6×	451 0.4×	429	10.1k

Countries citing papers authored by Masaaki Hirayama

Since Specialization

Citations

This map shows the geographic impact of Masaaki Hirayama'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 Masaaki Hirayama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Masaaki Hirayama more than expected).

Fields of papers citing papers by Masaaki Hirayama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Masaaki Hirayama. 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 Masaaki Hirayama. The network helps show where Masaaki Hirayama may publish in the future.

Co-authorship network of co-authors of Masaaki Hirayama

This figure shows the co-authorship network connecting the top 25 collaborators of Masaaki Hirayama. A scholar is included among the top collaborators of Masaaki Hirayama 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 Masaaki Hirayama. Masaaki Hirayama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Hamaguchi, Tomonari, Masako Ohara, Jun‐ichi Takeda, et al.. (2025). Desulfovibrio falkowii sp. nov., Porphyromonas miyakawae sp. nov., Mediterraneibacter flintii sp. nov. and Owariibacterium komagatae gen. nov., sp. nov., isolated from human faeces. INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY. 75(1).

Nakamura, Tomohiko, Takashi Tsuboi, Masaaki Hirayama, et al.. (2024). Decreased heart rate variability in sympathetic dominant states in Parkinson's disease and isolated REM sleep behavior disorder. Parkinsonism & Related Disorders. 124. 107020–107020. 1 indexed citations

Tamura, Shogo, Nobuaki Suzuki, Nagaharu Tsukiji, et al.. (2022). Periosteum-derived podoplanin-expressing stromal cells regulate nascent vascularization during epiphyseal marrow development. Journal of Biological Chemistry. 298(5). 101833–101833. 5 indexed citations

Nishiwaki, Hiroshi, Mikako Ito, Tomonari Hamaguchi, et al.. (2020). Meta‐Analysis of Gut Dysbiosis in Parkinson's Disease. Movement Disorders. 35(9). 1626–1635. 270 indexed citations breakdown →

Hirayama, Masaaki, et al.. (2018). A latent allocation model for the analysis of microbial composition and disease. BMC Bioinformatics. 19(S19). 519–519. 5 indexed citations

Hasegawa, Satoru, Hirokazu Tsuji, Tatsuya Okuno, et al.. (2015). Intestinal Dysbiosis and Lowered Serum Lipopolysaccharide-Binding Protein in Parkinson’s Disease. PLoS ONE. 10(11). e0142164–e0142164. 387 indexed citations breakdown →

Mizutani, Yasuaki, Tomohiko Nakamura, Junichiro Suzuki, et al.. (2014). Hyposmia and cardiovascular dysautonomia correlatively appear in early-stage Parkinson's disease. Parkinsonism & Related Disorders. 20(5). 520–524. 28 indexed citations

Hara, Takashi, Masaaki Hirayama, Yasuaki Mizutani, et al.. (2012). Impaired pain processing in Parkinson's disease and its relative association with the sense of smell. Parkinsonism & Related Disorders. 19(1). 43–46. 9 indexed citations

Hamano, Tadanori, Tatsuro Mutoh, Masaaki Hirayama, et al.. (2012). Winged scapula in patients with myotonic dystrophy type 1. Neuromuscular Disorders. 22(8). 755–758. 5 indexed citations

10.

Hirayama, Masaaki, et al.. (2011). Efficacy of mefloquine to progressive multifocal leukoencephalopathy initially presented with parkinsonism. Clinical Neurology and Neurosurgery. 114(6). 728–731. 15 indexed citations

11.

Suzuki, Keisuke, Masahisa Katsuno, Haruhiko Banno, et al.. (2009). The profile of motor unit number estimation (MUNE) in spinal and bulbar muscular atrophy. Journal of Neurology Neurosurgery & Psychiatry. 81(5). 567–571. 20 indexed citations

12.

Niimi, Yoshiki, Yasushi Iwasaki, Toshitaka Umemura, et al.. (2008). MM2‐cortical‐type sporadic Creutzfeldt‐Jakob disease with early stage cerebral cortical pathology presenting with a rapidly progressive clinical course. Neuropathology. 28(6). 645–651. 7 indexed citations

13.

Hirayama, Masaaki, Tomohiko Nakamura, Norio Hori, Yasuo Koike, & Gen Sobue. (2007). The video images of sleep attacks in Parkinson's disease. Movement Disorders. 23(2). 288–290. 8 indexed citations

14.

Hirayama, Masaaki. (2006). Sweating dysfunction in Parkinson's disease. Journal of Neurology. 253(7). 2 indexed citations

15.

Ikura, Yoshihiro, Norimitsu Shirai, Yoshimi Sugama, et al.. (2005). Expression of angiotensin II type 1 receptor in human cirrhotic livers: Its relation to fibrosis and portal hypertension. Hepatology Research. 32(2). 107–116. 34 indexed citations

16.

Hattori, Naoki, K Misu, Haruki Koike, et al.. (2001). Age of onset influences clinical features of chronic inflammatory demyelinating polyneuropathy. Journal of the Neurological Sciences. 184(1). 57–63. 54 indexed citations

17.

Koike, Yasuo, et al.. (1998). Polysomnographic Differences between Shy-Drager Syndrome and Sleep Apnea Syndrome. 35(5). 461–468. 1 indexed citations

18.

Koike, Y., et al.. (1997). Relationship between respiratory failure and plasma noradrenaline levels in amyotrophic lateral sclerosis. Clinical Autonomic Research. 7(4). 173–177. 23 indexed citations

19.

Hirayama, Masaaki, et al.. (1990). Practice of quality modelling and measurement on software life-cycle. International Conference on Software Engineering. 98–107. 3 indexed citations

20.

Sakai, Yasuhiro, Hirokazu Fujimoto, Masaaki Hirayama, & Shohei Yamashina. (1988). IMMUNO-CYTOCHEMICAL STUDY ON THE CHROMATOID BODY DURING MOUSE SPERMATOGENESIS. Development Growth & Differentiation. 30(4). 443. 2 indexed citations

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.

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