To test the feasibility of the proposed hybrid actuator, an experimental platform is set up (Fig. 12), and the grasping reflex experiments are conducted. The prototype of the prosthetic finger driven by the proposed hybrid actuator is constructed (Fig. 3), and is installed on a stage. Moreover, force-sensitive resistors (FSRs with the brand FSR-402 made by Interlink Electronics) are placed on the finger to detect grasping force. A folded plate working as a thumb is also installed on the stage opposite the finger. Initially, the finger is driven only by the motor actuator to approach and grasp a composite paper cup (φ65 × 100 mm, 60 g). The 1.8 V is applied to the DC motor. After a certain period, the system becomes steady. A 100 g external disturbance drops from 3 mm high and strikes the can. As the initial grasping force is insufficient for holding the can during the disturbance, the can begins to slip. The slip is identified as negative changes in the derivative of the force signal with 0.3 N/ms magnitude. As soon as slippage is detected in the current sampling period, grasping reflex is motivated in the next sampling period. The sampling period of the system is 1 ms. In grasping reflex, we compared between being driven only by the motor actuator and by the hybrid actuator. When being driven by the motor actuator, the voltage applied to DC motor increases to 6 V; and by the hybrid actuator, the voltage also increases to 6 V. The voltage applied to the SMA 1 increases to 25.5 V. To save energy, the SMA actuator is switched off after 100 ms. A laser displacement sensor (FT50 RLA-20-S-L4S) under the can is used to detect slip displacement.