The motor child, again, gets himself hurt a great many times in the same way, without developing enough self-control to restrain himself from the same mistake again and again; the sensory child tends to be timid in the presence of the unknown and uncertain, to learn from one or a few experiences, and to hold back until he gets satisfactory assurances that danger is absent.
The former tends to be more restless in sitting, standing, etc., more demonstrative in affection, more impulsive in action, more forgiving in disposition.
As to the treatment of the sensory child, it is a problem of even greater difficulty and danger than that of his motor brother.

The very nature of the distinction makes it evident that while the motor individual "gives himself away," so to speak, by constantly acting out his impressions, and so revealing his progress and his errors, with the other it is not so.

All knowledge that we are ever able to get of the mental condition of another individual is through his movements, expressive, in a technical sense, or of other kinds, such as his actions, attitudes, lines of conduct, etc.

We have no way to read thought directly.

So just in so far as the sensory individual is less active, to that degree he is less expressive, less self-revealing.