{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T01:44:37Z","timestamp":1778031877044,"version":"3.51.4"},"reference-count":17,"publisher":"World Scientific Pub Co Pte Ltd","issue":"11","funder":[{"DOI":"10.13039\/501100001809","name":"the Natural Science Foundation of China","doi-asserted-by":"crossref","award":["No. 11171017"],"award-info":[{"award-number":["No. 11171017"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Bifurcation Chaos"],"published-print":{"date-parts":[[2017,10]]},"abstract":"<jats:p> Three kinds of bifurcations of two coupled Rulkov neurons with electrical synapses are investigated in this paper. The critical normal forms are derived based on the center manifold theorem and the normal form theory. For the flip and the Neimark\u2013Sacker bifurcation, the quartic terms and above in the normal forms are defined as higher order terms, which originate from the Taylor expansion of the original system. Then the effects of the quartic and quintic terms on the flip and the Neimark\u2013Sacker bifurcation structure are discussed, which verifies that the normal form is locally topologically equivalent to the original system for the infinitesimal 4-sphere of initial conditions and tiny perturbation on the bifurcation curve. By the flip-Neimark\u2013Sacker bifurcation analysis, a novel firing pattern can be found which is that the orbit oscillates between two invariant cycles. Two disconnected cardioid cycles also appear, which makes one, two, three, four, etc. turns happen before closure. Finally, we present a global bifurcation structure in the parameter space and exhibit the distribution of the periodic, quasi-periodic and chaotic firing patterns of the coupled neuron model. <\/jats:p>","DOI":"10.1142\/s0218127417501784","type":"journal-article","created":{"date-parts":[[2017,11,21]],"date-time":"2017-11-21T22:45:43Z","timestamp":1511304343000},"page":"1750178","source":"Crossref","is-referenced-by-count":2,"title":["Effect of Higher Order Terms on the Bifurcation Structure of Coupled Rulkov Neurons"],"prefix":"10.1142","volume":"27","author":[{"given":"Lifang","family":"Cheng","sequence":"first","affiliation":[{"name":"Department of Mathematics, School of Sciences, Beijing Jiaotong University, Beijing 100044, P. R. China"},{"name":"College of Sciences, Zhongyuan University of Technology, Zhengzhou 450007, P. R. 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