Chika Sumiyoshi

1.2k total citations
39 papers, 890 citations indexed

About

Chika Sumiyoshi is a scholar working on Psychiatry and Mental health, Cognitive Neuroscience and Experimental and Cognitive Psychology. According to data from OpenAlex, Chika Sumiyoshi has authored 39 papers receiving a total of 890 indexed citations (citations by other indexed papers that have themselves been cited), including 30 papers in Psychiatry and Mental health, 17 papers in Cognitive Neuroscience and 10 papers in Experimental and Cognitive Psychology. Recurrent topics in Chika Sumiyoshi's work include Schizophrenia research and treatment (27 papers), Functional Brain Connectivity Studies (8 papers) and Neurobiology of Language and Bilingualism (7 papers). Chika Sumiyoshi is often cited by papers focused on Schizophrenia research and treatment (27 papers), Functional Brain Connectivity Studies (8 papers) and Neurobiology of Language and Bilingualism (7 papers). Chika Sumiyoshi collaborates with scholars based in Japan, United States and Türkiye. Chika Sumiyoshi's co-authors include Tomiki Sumiyoshi, Masayoshi Kurachi, Mié Matsui, Ikiko Yamashita, Shigeru Nohara, Ryota Hashimoto, Herbert Y. Meltzer, Hidenaga Yamamori, Yuka Yasuda and Michiko Fujimoto and has published in prestigious journals such as American Journal of Psychiatry, Biological Psychiatry and International Journal of Molecular Sciences.

In The Last Decade

Chika Sumiyoshi

37 papers receiving 865 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Chika Sumiyoshi Japan 16 503 336 235 145 109 39 890
Christopher A. Chaddock United Kingdom 11 507 1.0× 488 1.5× 203 0.9× 100 0.7× 77 0.7× 17 985
S C Bakker Netherlands 10 340 0.7× 295 0.9× 126 0.5× 135 0.9× 152 1.4× 12 782
R.S. Kahn Netherlands 14 504 1.0× 452 1.3× 101 0.4× 106 0.7× 142 1.3× 28 930
Shin’Ya Tayoshi Japan 14 288 0.6× 232 0.7× 229 1.0× 138 1.0× 45 0.4× 16 750
Matthew T. Avila United States 16 289 0.6× 203 0.6× 152 0.6× 202 1.4× 63 0.6× 23 683
Mar Fatjó‐Vilas Spain 19 335 0.7× 279 0.8× 169 0.7× 243 1.7× 246 2.3× 79 1.0k
Jennifer K. Forsyth United States 16 226 0.4× 348 1.0× 189 0.8× 128 0.9× 67 0.6× 26 758
Cali Bartholomeusz Australia 12 410 0.8× 209 0.6× 93 0.4× 93 0.6× 69 0.6× 20 772
Marko Manninen Finland 14 459 0.9× 500 1.5× 133 0.6× 75 0.5× 65 0.6× 27 1.0k
Deepak K. Sarpal United States 15 400 0.8× 593 1.8× 100 0.4× 81 0.6× 59 0.5× 36 1.0k

Countries citing papers authored by Chika Sumiyoshi

Since Specialization
Citations

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

Fields of papers citing papers by Chika Sumiyoshi

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Chika Sumiyoshi

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

All Works

20 of 20 papers shown
1.
Ito, Satsuki, Chika Sumiyoshi, Junya Matsumoto, et al.. (2025). Usefulness of the WAIS‐IV Short Form for Measuring Cognitive Function in Patients With Schizophrenia. Neuropsychopharmacology Reports. 45(1). e70000–e70000.
2.
Okubo, Ryo, Satoru Ikezawa, Yuji Yamada, et al.. (2022). Sex Differences in Social Cognition and Association of Social Cognition and Neurocognition in Early Course Schizophrenia. Frontiers in Psychology. 13. 867468–867468. 13 indexed citations
3.
Sumiyoshi, Chika, Zui Narita, Takuma Inagawa, et al.. (2021). Facilitative Effects of Transcranial Direct Current Stimulation on Semantic Memory Examined by Text-Mining Analysis in Patients With Schizophrenia. Frontiers in Neurology. 12. 583027–583027. 5 indexed citations
4.
Ohi, Kazutaka, Chika Sumiyoshi, Haruo Fujino, et al.. (2019). A 1.5-Year Longitudinal Study of Social Activity in Patients With Schizophrenia. Frontiers in Psychiatry. 10. 567–567. 9 indexed citations
5.
Sumiyoshi, Chika, Haruo Fujino, Tomiki Sumiyoshi, et al.. (2018). Semantic Memory Organization in Japanese Patients With Schizophrenia Examined With Category Fluency. Frontiers in Psychiatry. 9. 87–87. 10 indexed citations
6.
Ohi, Kazutaka, Chika Sumiyoshi, Haruo Fujino, et al.. (2017). A Brief Assessment of Intelligence Decline in Schizophrenia As Represented by the Difference between Current and Premorbid Intellectual Quotient. Frontiers in Psychiatry. 8. 293–293. 35 indexed citations
7.
Sumiyoshi, Chika, Haruo Fujino, Tomiki Sumiyoshi, et al.. (2016). Usefulness of the Wechsler Intelligence Scale short form for assessing functional outcomes in patients with schizophrenia. Psychiatry Research. 245. 371–378. 31 indexed citations
8.
Fujino, Haruo, Chika Sumiyoshi, Tomiki Sumiyoshi, et al.. (2015). Predicting employment status and subjective quality of life in patients with schizophrenia. Schizophrenia Research Cognition. 3. 20–25. 24 indexed citations
9.
Sumiyoshi, Chika, Philip D. Harvey, Manabu Takaki, et al.. (2015). Factors predicting work outcome in Japanese patients with schizophrenia: role of multiple functioning levels. Schizophrenia Research Cognition. 2(3). 105–112. 12 indexed citations
10.
Sumiyoshi, Chika, et al.. (2014). Utility of the UCSD Performance-based Skills Assessment-Brief Japanese version: discriminative ability and relation to neurocognition. Schizophrenia Research Cognition. 1(3). 137–143. 22 indexed citations
11.
Sumiyoshi, Chika, Aygün Ertuğrul, A. Elif Anıl Yağcıoğlu, et al.. (2014). Language-dependent performance on the letter fluency task in patients with schizophrenia. Schizophrenia Research. 152(2-3). 421–429. 11 indexed citations
12.
Sumiyoshi, Chika. (2011). [Functional outcome in schizophrenia: relation to the MATRICS consensus cognitive battery].. PubMed. 31(5-6). 251–7. 1 indexed citations
13.
Sumiyoshi, Chika, Yuki Kawakubo, Motomu Suga, Tomiki Sumiyoshi, & Kiyoto Kasai. (2010). Impaired ability to organize information in individuals with autism spectrum disorders and their siblings. Neuroscience Research. 69(3). 252–257. 32 indexed citations
14.
Sumiyoshi, Chika, Aygün Ertuğrul, A. Elif Anıl Yağcıoğlu, & Tomiki Sumiyoshi. (2009). Semantic memory deficits based on category fluency performance in schizophrenia: Similar impairment patterns of semantic organization across Turkish and Japanese patients. Psychiatry Research. 167(1-2). 47–57. 13 indexed citations
15.
Sumiyoshi, Tomiki, Chika Sumiyoshi, Shigeru Nohara, et al.. (2006). Verbal memory deficits in a preadolescent case of lesions of the left parahippocampal gyrus associated with a benign tumor. Progress in Neuro-Psychopharmacology and Biological Psychiatry. 30(4). 733–736. 4 indexed citations
16.
Sumiyoshi, Chika, Tomiki Sumiyoshi, Ajanta Roy, Karu Jayathilake, & Herbert Y. Meltzer. (2005). Atypical antipsychotic drugs and organization of long-term semantic memory: multidimensional scaling and cluster analyses of category fluency performance in schizophrenia. The International Journal of Neuropsychopharmacology. 9(6). 677–677. 28 indexed citations
17.
Sumiyoshi, Tomiki, Masahiko Tsunoda, Takashi Uehara, et al.. (2004). Enhanced locomotor activity in rats with excitotoxic lesions of the entorhinal cortex, a neurodevelopmental animal model of schizophrenia: Behavioral and in vivo microdialysis studies. Neuroscience Letters. 364(2). 124–129. 19 indexed citations
18.
Sumiyoshi, Chika, Tomiki Sumiyoshi, Mié Matsui, et al.. (2003). Effect of orthography on the verbal fluency performance in schizophrenia: examination using Japanese patients. Schizophrenia Research. 69(1). 15–22. 27 indexed citations
19.
Matsuo, Kayako, Chikako Kato, Chika Sumiyoshi, et al.. (2003). Discrimination of Exner's area and the frontal eye field in humans – functional magnetic resonance imaging during language and saccade tasks. Neuroscience Letters. 340(1). 13–16. 31 indexed citations
20.
Sumiyoshi, Chika. (1996). KUSHO BEHAVIOR IN REMEMBERING ENGLISH SPELLINGS. The Japanese Journal of Educational Psychology. 44(1). 75–84. 3 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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