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Even though several types of flexible tactile sensors have been proposed, they still have various technical issues such as a large amount of deformation that fractures the sensing elements, a poor maintainability and a deterioration in the sensitivity caused by the presence of a thick and soft covering. As one solution for these issues, we proposed a flexible tactile sensor composed of a magnet, magnetic transducer and dual-layer elastomer, which consists of a magnetorheological and nonmagnetic elastomer sheet. In this study, we first investigated the sensitivity of the sensor, which was found to be high (approximately 161 mV\/N with a signal-to-noise ratio of 42.2 dB); however, the sensor has a speed-dependent hysteresis in its sensor response curve. Then, we investigated the spatial response and observed the following results: (1) the sensor response was a distorted Mexican-hat-like bipolar shape, namely a negative response area was observed around the positive response area; (2) the negative response area disappeared when we used a compressible sponge sheet instead of the incompressible nonmagnetic elastomer. We concluded that the characteristic negative response in the Mexican-hat-like response is derived from the incompressibility of the nonmagnetic elastomer.<\/jats:p>","DOI":"10.3390\/s18020587","type":"journal-article","created":{"date-parts":[[2018,2,14]],"date-time":"2018-02-14T07:01:42Z","timestamp":1518591702000},"page":"587","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":54,"title":["Mexican-Hat-Like Response in a Flexible Tactile Sensor Using a Magnetorheological Elastomer"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4867-6996","authenticated-orcid":false,"given":"Takumi","family":"Kawasetsu","sequence":"first","affiliation":[{"name":"Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, Suita 5650871, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takato","family":"Horii","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering and Intelligent Systems, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu 1828585, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hisashi","family":"Ishihara","sequence":"additional","affiliation":[{"name":"Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, Suita 5650871, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minoru","family":"Asada","sequence":"additional","affiliation":[{"name":"Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, Suita 5650871, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2018,2,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Minato, T., Yoshikawa, Y., Noda, T., Ikemoto, S., Ishiguro, H., and Asada, M. 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