Abstract
The event-triggered neuromorphic microsystems are established to achieve the real-time monitoring for fruit fly behaviors. The microsystems are implemented by low temperature polysilicon (LTPS) process with PMOS-only design on glass substrate and TSMC 0.35 μm CMOS process on silicon substrate, respectively. In pixel circuits, the sensor adapts to the background illuminance and responds the negative illuminance transient to a digital signal. The output signals from pixel circuits are fed to the address event representation (AER) circuit usually applied in neuromorphic microsystems and then multiplexed onto a common address bus where the address encodes the location of the sending pixel. Furthermore, the system contains a window-of-interesting (WOI) function and this act allows to operate in two function modes, selection mode and tracking mode. Selection mode allows to choose an arbitrary area in the sensor array while disable the other area. The other is the tracking mode which contains a 3x3 area can lock onto a moving fly and continuously provide the location and visual information. At the same time, the tracking mode provides an approach to stimulate and track one chosen fly among the several flies. This WOI function is very useful in studying the behaviors of fruit flies.