Zeigarnik Effect

The tendency to remember uncompleted or interrupted tasks better than completed ones.

Unfinished tasks create cognitive tension — your brain keeps them 'active' until closure is achieved. Completed tasks are filed away and forgotten.

• A waiter remembering orders perfectly until they're served, then forgetting them instantly.
• Lying awake thinking about an unfinished work task.
• Cliffhangers in TV shows being so effective because they leave stories unresolved.

• Write down open tasks to 'offload' them from your mind.
• Use this effect positively: start tasks even briefly to create momentum.
• Before bed, write tomorrow's to-do list to quiet unfinished-task anxiety.
• Break large projects into smaller completable chunks for a sense of closure.