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Home NEWS Science News Biology

Building artificial nerve cells

Bioengineer by Bioengineer
February 22, 2022
in Biology
Reading Time: 3 mins read
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Artificial organic neurons schematic image
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For the first time, researchers demonstrate an artificial organic neuron, a nerve cell, that can be integrated with a living plant and an artificial organic synapse. Both the neuron and the synapse are made from printed organic electrochemical transistors.

Artificial organic neurons schematic image

Credit: Thor Balkhed

For the first time, researchers demonstrate an artificial organic neuron, a nerve cell, that can be integrated with a living plant and an artificial organic synapse. Both the neuron and the synapse are made from printed organic electrochemical transistors.

On connecting to the carnivorous Venus flytrap, the electrical pulses from the artificial nerve cell can cause the plant’s leaves to close, although no fly has entered the trap. Organic semiconductors can conduct both electrons and ions, thus helping mimic the ion-based mechanism of pulse (action potential) generation in plants. In this case, the small electric pulse of less than 0.6 V can induce action potentials in the plant, which in turn causes the leaves to close.

“We chose the Venus flytrap so we could clearly show how we can steer the biological system with the artificial organic system and get them to communicate in the same language”, says Simone Fabiano, associate professor and principal investigator in organic nanoelectronics at the Laboratory of Organic Electronics, Linköping University, Campus Norrköping.

In 2018 the research group at Linköping University became the first to develop complementary and printable organic electrochemical circuits – that is, with both n-type and p-type polymers, which conduct negative and positive charges. This made it possible to build printed complementary organic electrochemical transistors. The group has subsequently optimised the organic transistors, so that they can be manufactured in printing presses on thin plastic foil. Thousands of transistors can be printed on a single plastic substrate. Together with researchers in Lund and Gothenburg, the group has used the printed transistors to emulate the neurons and synapses of the biological system. The results have been published in the prestigious journal Nature Communications.

“For the first time, we’re using the transistor’s ability to switch based on ion concentration to modulate the spiking frequency”, says Padinhare Cholakkal Harikesh, post-doctoral researcher at the Laboratory of Organic Electronics.
The spiking frequency gives the signal that causes the biological system to react.

“We’ve also shown that the connection between the neuron and the synapse has a learning behaviour, called Hebbian learning. Information is stored in the synapse, which makes the signalling more and more effective”, says Simone Fabiano.

The hope is that artificial nerve cells can be used for sensitive human prostheses, implantable systems for relieving neurological diseases, and soft intelligent robotics.

“We’ve developed ion-based neurons, similar to our own, that can be connected to biological systems. Organic semiconductors have numerous advantages – they’re biocompatible, biodegradable, soft and formable. They only require low voltage to operate, which is completely harmless to both plants and vertebrates” explains Chi-Yuan Yang, post-doctoral researcher at the Laboratory of Organic Electronics.

The research has been financially supported by the Knut and Alice Wallenberg foundation, the Swedish Research Council, the Swedish Foundation for Strategic Research and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University among others.

The article:Organic Electrochemical Neurons and Synapses with Ion Mediated Spiking, Padinhare Cholakkal Harikesh, Chi-Yuan Yang, Deyu Tu, Jennifer Y. Gerasimov, Abdul Manan Dar, Adam Armada-Moreira, Matteo Massetti, Renee Kroon, David Bliman, Roger Olsson, Eleni Stavrinidou, Magnus Berggren, Simone Fabiano, Nature Communications 2022, doi 10.1038/s41467-022-28483-6

Contact: Simone Fabiano, [email protected] +46 11 36 36 33
 



Journal

Nature Communications

DOI

10.1038/s41467-022-28483-6

Method of Research

Experimental study

Subject of Research

Not applicable

Article Title

Organic Electrochemical Neurons and Synapses with Ion Mediated Spiking

Article Publication Date

22-Feb-2022

COI Statement

Chi-Yuan Yang, Magnus Berggren and Simone Fabiano are the founder of n-Ink AB. The other authors declare no competing interests.

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