Abstract

Emotions are closely related to multiplexed neurotransmission of glutamate and acetylcholine in the hippocampus, which are competitors and partners respectively. This paper demonstrates the first hetero-junction two-dimensional dual-excitatory artificial synapse (AS) for mimicking co-release of the two different neurotransmitters. This AS for the first time presents an immediate switchable plasticity between short-term of < 10 s and long-term of > 105 s, as both avoidance tendency of negative stimuli and lasting memory of positive emotion. 105 s represents so far the best long term memory of ion-regulated ASs. Inclusion of a fourth terminal as a monitor enables the emulation of automatic emotion regulation (AER). The AS array-based neural network achieves up to ~97% recognition accuracy for emotion-correlated electroencephalogram patterns; a new concept of early warning of negative emotions is proposed for monitoring mood changes, especially useful for babies and patients with mental disease, paving the way to future bio-inspired intelligent systems.

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