Ryotaro Ishii

1.3k total citations · 1 hit paper
36 papers, 912 citations indexed

About

Ryotaro Ishii is a scholar working on Psychiatry and Mental health, Neurology and Pathology and Forensic Medicine. According to data from OpenAlex, Ryotaro Ishii has authored 36 papers receiving a total of 912 indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Psychiatry and Mental health, 11 papers in Neurology and 8 papers in Pathology and Forensic Medicine. Recurrent topics in Ryotaro Ishii's work include Migraine and Headache Studies (13 papers), Trigeminal Neuralgia and Treatments (6 papers) and Parkinson's Disease Mechanisms and Treatments (5 papers). Ryotaro Ishii is often cited by papers focused on Migraine and Headache Studies (13 papers), Trigeminal Neuralgia and Treatments (6 papers) and Parkinson's Disease Mechanisms and Treatments (5 papers). Ryotaro Ishii collaborates with scholars based in Japan, United States and United Kingdom. Ryotaro Ishii's co-authors include Takahiko Tokuda, Masaaki Waragai, Claudia Trenkwalder, Brit Mollenhauer, Nicolás Méndez, Mohammad Shahnawaz, Claudio Soto, Harutsugu Tatebe, Toshiki Mizuno and Takashi Kasai and has published in prestigious journals such as PLoS ONE, Neurology and Scientific Reports.

In The Last Decade

Ryotaro Ishii

33 papers receiving 896 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.

Development of a Biochemical Diagnosis of Parkinson Disease by Detection of α-Synuclein Misfolded Aggregates in Cerebrospinal Fluid

2016 348 citations Takahiko Tokuda, Ryotaro Ishii et al. profile →

Peers

Ryotaro Ishii

NEURO

PHYSI

PMH

NEURO

Urszula Fiszer Poland

Tae‐Beom Ahn South Korea

Renpei Sengoku Japan

Zisis Tsouris Greece

Ling Chen China

Hirotaka Iwaki Japan

Aroldo Rossi Italy

Huicong Kang China

Ali Shoeibi Iran

Elena Caldarazzo Ienco Italy

Urszula Fiszer Poland

Ryotaro Ishii

403 ×0.9

NEURO

109 ×0.4

PHYSI

173 ×0.8

PMH

166 ×0.8

246 ×1.5

NEURO

Citations per year, relative to Ryotaro Ishii Ryotaro Ishii (= 1×) peers Urszula Fiszer

Countries citing papers authored by Ryotaro Ishii

Since Specialization

Citations

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

Fields of papers citing papers by Ryotaro Ishii

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ryotaro Ishii

This figure shows the co-authorship network connecting the top 25 collaborators of Ryotaro Ishii. A scholar is included among the top collaborators of Ryotaro Ishii 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 Ryotaro Ishii. Ryotaro Ishii 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

Maekawa, Takuya, et al.. (2025). Work productivity by diseases diagnosed among workers: a study using large-scale claims data and survey data of workers in Japan. Journal of Occupational Health. 67(1).

Takizawa, Tsubasa, Daisuke Danno, Ryotaro Ishii, et al.. (2025). The dual impact of ictal and interictal burden in migraine: an analysis from the ObserVational survey of the Epidemiology, tReatment, and Care Of MigrainE (OVERCOME) Japan second study. The Journal of Headache and Pain. 26(1). 140–140. 2 indexed citations

Dumkrieger, Gina, Ryotaro Ishii, & Peter J. Goadsby. (2024). Flexible modeling of headache frequency fluctuations in migraine with hidden Markov models. Headache The Journal of Head and Face Pain. 65(1). 132–142. 1 indexed citations

Danno, Daisuke, Shiho Suzuki, Tsubasa Takizawa, et al.. (2024). The Impact of Migraine on the Whole Life Course of Patients: Results from the OVERCOME (Japan) 2nd Study. Neurology and Therapy. 14(1). 335–356. 2 indexed citations

Ishii, Ryotaro, et al.. (2024). Efficacy and tolerability of 100 mg of lasmiditan for migraine: A multi-center, prospective observational real-world study in Japan. Cephalalgia. 44(6). 2225303751–2225303751. 6 indexed citations

Ishii, Ryotaro, et al.. (2023). Zinc Administration Favorably Affects Prophylactic Therapy-refractory Migraine Attacks: A Case Series. Internal Medicine. 63(11). 1631–1635. 1 indexed citations

Ishii, Ryotaro, Todd J. Schwedt, Gina Dumkrieger, et al.. (2021). Mild traumatic brain injury affects the features of migraine. The Journal of Headache and Pain. 22(1). 80–80. 17 indexed citations

Ishii, Ryotaro, Todd J. Schwedt, Gina Dumkrieger, et al.. (2021). Chronic versus episodic migraine: The 15‐day threshold does not adequately reflect substantial differences in disability across the full spectrum of headache frequency. Headache The Journal of Head and Face Pain. 61(7). 992–1003. 64 indexed citations

Satõ, Mitsuo, Kayoko Ohtsuka, Ryohei Doi, et al.. (2021). An outbreak of food poisoning due toEscherichia coliserotype O7:H4 carryingastAfor enteroaggregativeE. coliheat-stable enterotoxin1 (EAST1). Epidemiology and Infection. 149. e244–e244. 18 indexed citations

10.

Ishii, Ryotaro, Todd J. Schwedt, Soo-Kyoung Kim, et al.. (2020). Effect of Migraine on Pregnancy Planning: Insights From the American Registry for Migraine Research. Mayo Clinic Proceedings. 95(10). 2079–2089. 25 indexed citations

11.

Nakamura, Takashi, Hirofumi Sakaguchi, Ryotaro Ishii, et al.. (2017). Cerebellar ataxia with neuropathy and vestibular areflexia syndrome (CANVAS). Auris Nasus Larynx. 45(4). 866–870. 12 indexed citations

12.

Kasai, Takashi, Masaki Kondo, Ryotaro Ishii, et al.. (2017). Aβ levels in the jugular vein and high molecular weight Aβ oligomer levels in CSF can be used as biomarkers to indicate the anti-amyloid effect of IVIg for Alzheimer’s disease. PLoS ONE. 12(4). e0174630–e0174630. 6 indexed citations

13.

Ito, Hiromi, Kenneth E. Nollet, Yoshiki Yamaguchi, et al.. (2016). Subgroup differences in ‘brain-type’ transferrin and α-synuclein in Parkinson’s disease and multiple system atrophy. The Journal of Biochemistry. 160(2). 87–91. 7 indexed citations

14.

Kasai, Takashi, Takahiko Tokuda, Takuma Ohmichi, et al.. (2016). Serum Levels of Coenzyme Q10 in Patients with Multiple System Atrophy. PLoS ONE. 11(1). e0147574–e0147574. 33 indexed citations

15.

Murakami, Kazuma, Takashi Suzuki, Naotaka Izuo, et al.. (2016). Monoclonal antibody with conformational specificity for a toxic conformer of amyloid β42 and its application toward the Alzheimer’s disease diagnosis. Scientific Reports. 6(1). 29038–29038. 46 indexed citations

16.

Ishii, Ryotaro, Takahiko Tokuda, Harutsugu Tatebe, et al.. (2015). Decrease in Plasma Levels of α-Synuclein Is Evident in Patients with Parkinson’s Disease after Elimination of Heterophilic Antibody Interference. PLoS ONE. 10(4). e0123162–e0123162. 48 indexed citations

17.

Chambers, James, Takahiko Tokuda, Kazuyuki Uchida, et al.. (2015). The domestic cat as a natural animal model of Alzheimer’s disease. Acta Neuropathologica Communications. 3(1). 78–78. 62 indexed citations

18.

Kasai, Takashi, Takahiko Tokuda, Ryotaro Ishii, et al.. (2014). Increased α-synuclein levels in the cerebrospinal fluid of patients with Creutzfeldt–Jakob disease. Journal of Neurology. 261(6). 1203–1209. 31 indexed citations

19.

Ohara, Tomoyuki, Yasumasa Yamamoto, Aiko Tamura, Ryotaro Ishii, & Tomohiko Murai. (2010). The infarct location predicts progressive motor deficits in patients with acute lacunar infarction in the lenticulostriate artery territory. Journal of the Neurological Sciences. 293(1-2). 87–91. 61 indexed citations

20.

Ishii, Ryotaro, et al.. (2009). CSF normocytosis in meningitis due to primary infection of human immunodeficiency virus. Rinsho Shinkeigaku. 49(2/3). 100–103.

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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