Final answer:
Directed attention fatigue refers to mental exhaustion caused by sustained focus on a task. It can result in decreased cognitive function, reduced productivity, and increased stress levels. Sleep debt and deprivation can also contribute to attention fatigue.
Step-by-step explanation:
Directed attention fatigue refers to the mental exhaustion that occurs as a result of sustained focus and effort on a task. The costs of directed attention fatigue can manifest in various ways, including decreased cognitive function, reduced productivity, and increased stress levels. When our attention is constantly directed towards specific tasks, it can lead to difficulty concentrating, feeling overwhelmed, and experiencing difficulty in maintaining other obligations. Sleep debt and sleep deprivation also contribute to attention fatigue, leading to decreased mental alertness and cognitive function.