VR Cybersickness: Understanding Sensory Conflict in Virtual Reality

What is VR Cybersickness?

VR cybersickness, also known as motion sickness in virtual reality (MSVR), is a condition where users experience symptoms such as dizziness, nausea, and disorientation when their visual and vestibular systems are not in agreement. This can occur when the brain receives conflicting signals from different sensory inputs, particularly when there's a mismatch between what the eyes see and what the inner ear detects.

The term 'sensory conflict' refers to the discrepancy between these two sets of information. In VR, this often happens because the visual system perceives motion that does not correspond with the vestibular system’s sense of balance.

Factors Contributing to Sensory Conflict

Several factors can contribute to sensory conflict in VR and lead to cybersickness. These include the speed and smoothness of movement, field of view (FOV), and the latency between visual input and physical motion. For instance, rapid or jerky movements can cause a significant mismatch between what is seen and what the body feels, leading to disorientation.

The FOV also plays a crucial role; a wider FOV can make users feel more immersed but may increase the risk of sensory conflict if not managed properly. Additionally, latency—the delay between when a user moves their head or hand in VR and when that movement is reflected on screen—can exacerbate cybersickness by creating an out-of-sync experience.

How Does Sensory Conflict Lead to Cybersickness?

When the visual system perceives motion, it sends signals to the brain that are interpreted as movement. However, if these signals do not match up with the vestibular system’s perception of balance and spatial orientation, the brain becomes confused. This conflict can lead to a range of symptoms, including dizziness, nausea, and even vomiting.

The body's natural response to this confusion is often to try to correct it by reducing motion or seeking out a stable environment. In VR, this can manifest as disorientation, difficulty focusing, or an overall sense of discomfort.

Mitigating Sensory Conflict

To reduce the risk of cybersickness in VR, developers and users can take several steps. These include optimizing motion smoothness, adjusting field of view to balance immersion with comfort, and minimizing latency between visual input and physical movement.

Users can also adapt by taking breaks during long VR sessions, practicing mindfulness techniques, or using anti-sickness medications if necessary. Understanding these factors helps in designing more comfortable and enjoyable VR experiences.

Frequently asked questions

Try it live

Everything above runs in your browser — open VR Cybersickness: Sensory Conflict Simulator (2D) and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.