anticipated

However, the development of more advanced computer intelligence [is proving to be more challenging than anticipated.] One trial to determine whether a computer appears to “think" involves a human judge having two conversations, one with a human and one with a machine. If the human judge is unable to distinguish between them, then the machine has passed the test. To date, no computer has succeeded. The key area where AI stumbles is the ability to make connections between seemingly unconnected things in order to generate creative thought. However, AI is getting more sophisticated: Machines have created music and played games that have fooled human judges; devices tell lifeguards if someone is drowning; and computers control traffic flow in our cities.

I have no idea what [] means. Do you?