Moderate levels of fear or stress can enhance focus and performance on simple tasks, but intense or chronic fear severely impairs complex problem-solving and long-term goal setting.

This phenomenon aligns with the Yerkes-Dodson Law, which suggests that performance on a task increases with physiological or mental arousal, but only up to a point. A healthy dose of fear or stress can narrow our attention, helping us focus on immediate, relevant details and perform better under pressure for simple tasks. Think of a tight deadline or an athletic competition. However, when fear becomes overwhelming or prolonged, it leads to cognitive rigidity, tunnel vision, and difficulty integrating new information. The brain's resources become entirely dedicated to threat detection and basic survival, leaving little capacity for abstract thought, creative solutions, or sustained planning for the future.