We built a computer circuit made of salt water that actually 'hears' sounds the same way a human brain does.
March 23, 2026
Original Paper
Nonlinear iontronic signal processing with neuromorphic Spike Rate-Dependent Plasticity
arXiv · 2603.20126
The Takeaway
Instead of using silicon chips and electricity, this 'iontronic' device uses the flow of charged atoms in liquid to process information. It successfully distinguished between the sounds of different insects, mimicking the energy-efficient way human neurons operate.
From the abstract
We present an integrated iontronic memristor circuit that reproduces biologically inspired Spike Rate-Dependent Plasticity (SRDP) and functions as a physical nonlinear frequency kernel, which we demonstrate can be used to classify natural auditory data. The fluidic circuit integrates two parallel memristive membranes containing short and long conical memristive channels with opposite orientations, giving rise to heterogeneous internal timescales and different potentiation responses. As a result,