A new study suggests that the need to communicate after dark around campfires may have driven the transition from gestural to spoken language.

Researchers from the University of St Andrews suggest that the shift from gestural to spoken language may have been influenced by the limitations of communicating in firelight. Because firelight is too dim to reliably convey complex gestures, early humans likely shifted toward speech to maintain communication after dark. This transition allowed for the development of expressive storytelling, which helped strengthen social bonds and cultural development among early ancestors.

The Shift from Gesture to Speech

While many theories suggest human language began with gestures—similar to how modern humans communicate without a shared language—gestures require adequate light to be understood. The study argues that as early humans gathered around campfires, the dim light necessitated a more effective mode of communication. Spoken language allowed for expressive storytelling in the dark while retaining gestural elements for emphasis.

Social Bonding and Firelight

The researchers note that the color spectrum of firelight is well-suited for human vision and does not suppress melatonin, unlike modern screen light. Furthermore, human neurons synchronize to the frequency of flickering firelight, which may promote empathy and shared social experiences. This environment likely fostered the evolution of storytelling, which helped early humans develop imagination, identity, and social structures.

Evolution of Oral Traditions

The study suggests that early oral traditions evolved through a process similar to natural selection, where the most memorable aspects of stories survived. Stories that focused on social bonds, unexpected dangers, and survival were more likely to be passed down. This social transmission helped early humans navigate their world and understand complex social behaviors.