Conclusion

        We have demonstrated an artificial multisensory integration neuron with haptic and temperature perception behaviors based on VO2 volatile memristor coupled with piezoresistive sensor. Such spiking neurons can be used to sense different pressure inputs and convert them into spike trains as a result of the voltage dividing effect between the piezoresistive sensor and VO2 memristor. Besides, the spiking neuron is also capable of sensing temperature, by taking advantage of the intrinsic thermal sensitivity of metal-insulator transition in VO2. Such spiking neuron is utilized to recognize Braille characters based on integration of multiple spatial correlated sensory stimuli, and the coordination of haptic and temperature sensory inputs give rise to recognition of multimodal haptic/temperature patterns. It should be noted that the VO2 based sensory neurons exhibit fast speed, acceptable cycle-to-cycle and device-to-device variations, but still show relatively high power consumption, owing to the relatively high Vth (~1.4 V) and the low resistance of LRS (~500 Ω). It is expected that the Vth could be reduced by decreasing the length of the channel of the VO2 memristor (see detailed results in Figure S15, Supporting Information), and the on-state resistance of the device might be reduced by further optimizing the growth of the VO2 films. Our work offers new insights into neuromorphic perceptions and neuromorphic computing and the memristor based multisensory component shows great potential in cyborg systems, humanoid robotic systems, human–machine systems, and prosthetic system.

Acknowledgements

This work was supported by the National Key R&D Program of China (2017YFA0207600), National Natural Science Foundation of China (61925401, 92064004, 61927901, 92164302), Project 2019BD002 and 2020BD010 supported by PKU-Baidu Fund, and the 111 Project (B18001). Y.Y. acknowledges the support from the Fok Ying-Tong Education Foundation and the Tencent Foundation through the XPLORER PRIZE.

Conflict of interest

The authors declare no conflict of interest.

Supporting Information

The supporting information is available in this DOI:  10.22541/au.164668805.57431051/v1  

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