What will be the next big thing in artificial intelligence in the next 10 to 20 years? | Science, Technology, and Current Futurism | Scoop.it

What field to choose if someone is interested in pursuing his PhD to start research work on AI. What will be the next step of human in the field of AI research?
1. Natural language processing
2. Machine learning
3. Pattern recognition
4. Robotics
5. Cognitive science
6. Nonlinear control

Above is breakdown of AI but a specific and detailed answer will be helpful.

Via Pierre Tran