Pupils automatically dilate in response to intense cognitive effort, expanding measurably when your brain is struggling to solve complex math equations or process incredibly difficult information.

A closer look

Pupils automatically dilate in response to intense cognitive effort, expanding measurably when your brain is struggling to solve complex math equations or process incredibly difficult information. The harder your mind works, the wider your pupils become, acting as a highly visible biological indicator of your mental exhaustion. This means your eyes are constantly snitching on you during important corporate meetings, broadcasting to the entire conference room exactly when your brain completely checked out and stopped comprehending the quarterly revenue charts