Short-Term Plasticity and Long-Term Potentiation in Artificial Biosynapses with Diffusive Dynamics

Area of Science:

• Materials Science
• Neuroscience
• Biotechnology

Background:

• Replicating human brain capabilities requires electronic devices with biological synapse functionality.
• Renewable natural materials offer advantages like abundance, low cost, biodegradability, and environmental friendliness for artificial synapse development.

Purpose of the Study:

• To report a biocompatible artificial synapse utilizing a biopolymer matrix and Ag dynamics.
• To emulate key biological synapse functions, including short-term plasticity (STP), paired-pulse facilitation (PPF), and the transition to long-term potentiation (LTP).

Main Methods:

• Fabrication of an artificial synapse using a ι-carrageenan (ι-car) biopolymer matrix.
• Exploitation of silver (Ag) dynamics within the ι-car matrix to mimic biological calcium (Ca2+) dynamics.
• Characterization of synaptic plasticity behaviors, including STP, PPF, and STP-to-LTP transition.

Main Results:

• The ι-car-based artificial synapse successfully emulated short-term plasticity (STP).
• Paired-pulse facilitation (PPF) was effectively mimicked.
• The transition from short-term plasticity to long-term potentiation (LTP) was demonstrated, mirroring biological synapse behavior.

Conclusions:

• The study demonstrates a novel method using biomaterials and Ag dynamics to emulate synaptic functions.
• ι-carrageenan shows significant potential for constructing neuromorphic systems with biocompatible artificial synapses.
• This research highlights the viability of natural materials in developing advanced, eco-friendly neuromorphic computing.