They raise three big worries. First, information overload can make people feel anxious and powerless: scientists have discovered that multitaskers produce more stress hormones. Second, overload can reduce creativity. Teresa Amabile of Harvard Business School has spent more than a decade studying the work habits of 238 people, collecting a total of 12,000 diary entries between them. She finds that focus and creativity are connected. People are more likely to be creative if they are allowed to focus on something for some time without interruptions. If constantly interrupted or forced to attend meetings, they are less likely to be creative. Third, overload can also make workers less productive. David Meyer, of the University of Michigan, has shown that people who complete certain tasks in parallel take much longer and make many more errors than people who complete the same tasks in sequence.
via Schumpeter: Too much information | The Economist.