What Is Human-robot Interaction?

Human-robot interaction (HRI) is a field of robotics and engineering concerned with understanding, designing, and evaluating robotic systems that work alongside, collaborate with, or are operated by human beings. It addresses the technical and human factors challenges that arise when people and robots share a task, an environment, or a physical contact space. HRI draws on robotics, control engineering, cognitive science, and ergonomics, and spans purely social interactions with assistive or service robots through to forceful physical collaboration in manufacturing and rehabilitation.

The field developed as a recognized discipline in the 1990s and 2000s, when advances in sensor technology and computational power made it practical to deploy robots in unstructured environments around people rather than confined to safety cages. The ACM/IEEE International Conference on Human-Robot Interaction, first held in 2006, is the premier annual venue for the research community. As robots have expanded from factory floors into hospitals, homes, and public spaces, the scope of HRI has expanded correspondingly, encompassing questions of trust, legibility, safety, and social norm compliance.

Physical Interaction and Admittance Control

Physical human-robot interaction (pHRI) covers the mechanics of force and motion sharing between a human and a robot in direct contact. Admittance control is the dominant framework for managing this exchange: the robot measures forces applied by the human through a force-torque sensor and responds with corresponding motions, rendering a defined mechanical admittance (the ratio of velocity to force). By adjusting virtual inertia and damping parameters, an admittance-controlled robot can feel compliant and easy to guide or, when limits are approached, stiffen to prevent unsafe movements.

IEEE Xplore research on admittance control for industrial cobots demonstrates how force-torque-equipped manipulators achieve safe and intuitive collaborative manipulation, allowing operators to physically guide robots through tasks without pre-programmed trajectories. Variable admittance strategies adapt the mechanical response dynamically based on human intent estimation, improving interaction fluency in unstructured tasks.

Social and Collaborative Robotics

Social robotics addresses how robots communicate intent, status, and social cues to human partners through motion, gaze, sound, and gesture. Legible robot motion, motion that makes the robot's goals apparent to a human observer, reduces uncertainty and supports efficient joint action in shared workspaces. Collaborative robots (cobots) designed for industry, such as the Universal Robots UR series or the KUKA LBR iiwa, are engineered from the outset for close proximity operation with force-limiting hardware and certified to ISO/TS 15066, the technical specification governing cobot safety requirements.

Trust is a central behavioral variable in social HRI: humans calibrate their level of reliance on a robot based on its observed reliability, predictability, and perceived competence. Miscalibrated trust, either overtrusting a robot that makes errors or undertrusting a robot that is performing well, degrades collaborative performance and, in safety-critical applications, creates risk.

Teleoperation and Haptic Feedback

Teleoperation extends human-robot interaction across distance, with the human operating a remote robot through a control interface that may provide visual, auditory, or haptic feedback from the remote environment. Haptic feedback, in particular, transmits force and texture information from the robot's end-effector to the operator's hand, allowing fine manipulation tasks that would be impossible without a sense of contact forces. The tactile internet concept envisions ultra-low-latency communication networks capable of transmitting haptic data in real time, enabling remote surgery and precision assembly across geographical distances.

Research on contact-based physical human-robot interaction at arXiv surveys the control architectures, sensing modalities, and safety mechanisms required for reliable physical contact between humans and robots across a wide range of task domains.

Applications

Human-robot interaction has applications across a wide range of disciplines, including:

• Wearable robots and powered exoskeletons for rehabilitation and mobility assistance
• Industrial cobot assembly and collaborative manufacturing
• Surgical robotics and minimally invasive procedure assistance
• Search and rescue robotics in disaster environments
• Companion and assistive robots for elderly and disabled users