Daniel Mannion opened discussion of the paper by Hyunsang Hwang: This is a question regarding your devices relating to Fig. 21 of your paper (DOI: 10.1039/c8fd00127h). The caption states the potentiation and depression observed in Fig. 21a and 21b respectively are for separate devices with different composition. Is it that each device exhibits only one of the behaviours shown or do the two devices exhibit both potentiation and depression as well? Also, what is the retention time of this potentiation and depression?Hyunsang Hwang responded: Thank you for your comment. It was a typo. We measured potentiation and depression using a Mo/TiOx/TiN device. I will revise the manuscript. Although we did not perform an in-depth study on retention characteristics, we cannot guarantee long-term retention using the Mo/TiOx/TiN device.