Helli Merica

1.4k total citations
21 papers, 1.1k citations indexed

About

Helli Merica is a scholar working on Cognitive Neuroscience, Experimental and Cognitive Psychology and Endocrine and Autonomic Systems. According to data from OpenAlex, Helli Merica has authored 21 papers receiving a total of 1.1k indexed citations (citations by other indexed papers that have themselves been cited), including 17 papers in Cognitive Neuroscience, 11 papers in Experimental and Cognitive Psychology and 4 papers in Endocrine and Autonomic Systems. Recurrent topics in Helli Merica's work include Sleep and Wakefulness Research (17 papers), Sleep and related disorders (11 papers) and EEG and Brain-Computer Interfaces (8 papers). Helli Merica is often cited by papers focused on Sleep and Wakefulness Research (17 papers), Sleep and related disorders (11 papers) and EEG and Brain-Computer Interfaces (8 papers). Helli Merica collaborates with scholars based in Switzerland, United States and Ireland. Helli Merica's co-authors include R. Blois, Jean‐Michel Gaillard, J.-M. Gaillard, Michael L. Perlis, Michael T. Smith, Donna E. Giles, Christophe C. Jouny, Florian Chapotot, Lampros Perogamvros and Kateřina Červená and has published in prestigious journals such as PLoS ONE, Cerebral Cortex and SLEEP.

In The Last Decade

Helli Merica

21 papers receiving 1.1k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Helli Merica Switzerland 15 957 732 373 94 50 21 1.1k
Richard L. Koresko United States 13 634 0.7× 476 0.7× 217 0.6× 100 1.1× 9 0.2× 16 777
Pietro‐Luca Ratti Italy 15 543 0.6× 267 0.4× 90 0.2× 54 0.6× 11 0.2× 25 849
Marco Filardi Italy 19 566 0.6× 531 0.7× 242 0.6× 54 0.6× 12 0.2× 68 887
Médhi Gilson Belgium 9 271 0.3× 301 0.4× 74 0.2× 14 0.1× 19 0.4× 10 452
Marjolaine Lafortune Canada 11 941 1.0× 617 0.8× 217 0.6× 86 0.9× 10 0.2× 15 1.0k
Seung Chul Hong South Korea 12 509 0.5× 421 0.6× 263 0.7× 52 0.6× 2 0.0× 30 711
Gerhard Dirlich Germany 15 309 0.3× 200 0.3× 139 0.4× 76 0.8× 75 1.5× 26 589
Soufiane Boucetta Canada 8 435 0.5× 194 0.3× 190 0.5× 194 2.1× 24 0.5× 11 576
James J. Quattrochi United States 18 541 0.6× 125 0.2× 403 1.1× 300 3.2× 63 1.3× 28 815

Countries citing papers authored by Helli Merica

Since Specialization
Citations

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

Fields of papers citing papers by Helli Merica

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Helli Merica

This figure shows the co-authorship network connecting the top 25 collaborators of Helli Merica. A scholar is included among the top collaborators of Helli Merica 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 Helli Merica. Helli Merica 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.
Červená, Kateřina, Fabrice Espa, Lampros Perogamvros, et al.. (2013). Spectral analysis of the sleep onset period in primary insomnia. Clinical Neurophysiology. 125(5). 979–987. 36 indexed citations
2.
3.
Merica, Helli, et al.. (2004). State transitions between wake and sleep, and within the ultradian cycle, with focus on the link to neuronal activity. Sleep Medicine Reviews. 8(6). 473–485. 74 indexed citations
4.
5.
Merica, Helli. (2003). A Unique Pattern of Sleep Structure is Found to be Identical at all Cortical Sites: a Neurobiological Interpretation. Cerebral Cortex. 13(10). 1044–1050. 10 indexed citations
6.
Perlis, Michael L., Helli Merica, Michael T. Smith, & Donna E. Giles. (2001). Beta EEG activity and insomnia. Sleep Medicine Reviews. 5(5). 365–376. 255 indexed citations
7.
Jouny, Christophe C., Florian Chapotot, & Helli Merica. (2000). EEG spectral activity during paradoxical sleep. Neuroreport. 11(17). 3667–3671. 31 indexed citations
8.
Merica, Helli, et al.. (2000). Brainstem origin for a new very slow (1mHz) oscillation in the human non-REM sleep episode.. PubMed. 3(2). 53–9. 11 indexed citations
9.
Merica, Helli, R. Blois, & J.-M. Gaillard. (1998). Spectral characteristics of sleep EEG in chronic insomnia. European Journal of Neuroscience. 10(5). 1826–1834. 258 indexed citations
10.
Merica, Helli & R. Blois. (1997). Relationship between the time courses of power in the frequency bands of human sleep EEG. Neurophysiologie Clinique. 27(2). 116–128. 60 indexed citations
11.
Merica, Helli. (1997). A Neuronal Transition Probability Model for the Evolution of Power in the Sigma and Delta Frequency Bands of Sleep EEG. Physiology & Behavior. 62(3). 585–589. 36 indexed citations
12.
Merica, Helli, et al.. (1997). Evolution of Delta Activity Within the NonREM Sleep Episode: A Biphasic Hypothesis. Physiology & Behavior. 62(1). 213–219. 7 indexed citations
13.
Signoret, Patrick, R. Blois, Helli Merica, & Jean‐Michel Gaillard. (1994). Subjective Assessment of Sleep: Statistical Analysis in a Population of Healthy Subjects. Neuropsychobiology. 30(2-3). 79–84. 4 indexed citations
14.
Merica, Helli, et al.. (1993). New variables for defining sleep continuity. Physiology & Behavior. 54(5). 825–831. 9 indexed citations
15.
Merica, Helli & Jean‐Michel Gaillard. (1992). The EEG of the sleep onset period in insomnia: A discriminant analysis. Physiology & Behavior. 52(2). 199–204. 107 indexed citations
16.
Merica, Helli & Jean‐Michel Gaillard. (1991). A study of the interrupted REM episode. Physiology & Behavior. 50(6). 1153–1159. 33 indexed citations
17.
Merica, Helli & Jean‐Michel Gaillard. (1986). Internal Structure of Sleep Cycles in a Healthy Population. SLEEP. 9(4). 502–513. 24 indexed citations
18.
Chapuis, B, M Jeannet, Helli Merica, et al.. (1986). Increased frequency of DR2 in patients with aplastic anaemia and increased DR sharing in their parents. British Journal of Haematology. 63(1). 51–57. 32 indexed citations
19.
Merica, Helli & Jean‐Michel Gaillard. (1985). Statistical Description and Evaluation of the Interrelationships of Standard Sleep Variables for Normal Subjects. SLEEP. 8(3). 261–273. 46 indexed citations
20.
Merica, Helli, M Jeannet, C Barras, et al.. (1983). Evidence for HLA-linked susceptibility factors in childhood leukemia. Human Immunology. 8(3). 183–193. 14 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Richard L. Koresko Breakdown of academic impact, for papers by Pietro‐Luca Ratti Breakdown of academic impact, for papers by Marco Filardi Breakdown of academic impact, for papers by Médhi Gilson Breakdown of academic impact, for papers by Marjolaine Lafortune Breakdown of academic impact, for papers by Seung Chul Hong Breakdown of academic impact, for papers by Gerhard Dirlich Breakdown of academic impact, for papers by Soufiane Boucetta Breakdown of academic impact, for papers by James J. Quattrochi
Rankless by CCL
2026