Machine Vision:
It is easy to interface a TV camera to a computer and get an image into
memory; the problem is understanding what the image represents.
Vision takes lots of computation; in humans, roughly 10% of all
calories consumed are burned in vision computation.
Speech Understanding:
Speech understanding is available now. Some systems must be
trained for the individual user and require pauses between words.
Understanding continuous speech with a larger vocabulary is harder.
Touch ( tactile or haptic) Sensation:
Important for robot assembly tasks.