Outan: An On-Head System for Driving micro-LED Arrays Implanted in Freely Moving Mice
Alexander Tarnavsky Eitan, Shirly Someck, Mario Zajac, Eran Socher,, Eran Stark

TL;DR
Outan is a lightweight, high-resolution, multi-channel micro-LED stimulation system integrated into a headstage for freely moving mice, enabling precise neural activity control with a compact design.
Contribution
We developed a miniaturized, high-resolution current source chip integrated into a headstage for multi-channel micro-LED stimulation in freely moving animals.
Findings
System provides 10-bit resolution control for 32 channels
Capable of driving micro-LEDs with up to 4.6 V and 0.9 mA at 5 kHz
Enables complex stimulation patterns in freely moving mice
Abstract
In the intact brain, neural activity can be recorded using sensing electrodes and manipulated using light stimulation. Silicon probes with integrated electrodes and micro-LEDs enable the detection and control of neural activity using a single implanted device. Miniaturized solutions for recordings from small freely moving animals are commercially available, but stimulation is driven by large, stationary current sources. We designed and fabricated a current source chip and integrated it into a headstage PCB that weighs 1.37 g. The proposed system provides 10-bit resolution current control for 32 channels, driving micro-LEDs with up to 4.6 V and sourcing up to 0.9 mA at a refresh rate of 5 kHz per channel. When calibrated against a micro-LED probe, the system allows linear control of light output power, up to 10 micro-W per micro-LED. To demonstrate the capabilities of the system,…
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Taxonomy
MethodsPart-based Convolutional Baseline
