Core Viewpoint - Fiber electronic devices are transforming traditional fibers and garments into a new generation of wearable devices that actively interact with the human body and environment, shaping future lifestyles. However, a viable information processing fiber remains a missing piece in building intelligent interactive fiber systems, which is crucial for any electronic product [1]. Group 1: Fiber Integrated Circuits - A recent study published in Nature by researchers from Fudan University introduced "fiber chips," which integrate large-scale circuits within elastic polymer fibers, successfully combining power supply, sensing, display, and signal processing into a single fiber, paving a new path for fiber electronic systems [1]. - The fiber integrated circuits (FICs) achieve a transistor density of 100,000 per centimeter, meeting the requirements for interactive fiber systems. They can process both digital and analog signals and perform high-precision neural computations similar to advanced memory image processors [7]. Group 2: Challenges and Innovations - The development of viable fiber information processors is essential for creating flexible, stretchable, and lightweight fiber devices, contrasting with traditional rigid silicon-based processors. The main challenge lies in integrating numerous micro-devices into elastic and thin fibers, overcoming inherent limitations such as soft cylindrical geometry and limited surface area [5]. - FICs maintain stability under harsh conditions, such as repeated bending and wear (10,000 times), stretching (30%), twisting (180 cm^-1), and even being crushed by a 15.6-ton container truck. This flexibility enables the possibility of closed-loop systems within a single fiber without the need for external rigid processing devices [7]. Group 3: Future Applications - The realization of fully flexible fiber systems opens pathways for advanced applications, including brain-machine interfaces, smart textiles, and virtual reality wearable devices, indicating a significant step towards the evolution of fiber devices into intelligent systems [7].