When relating personally to the student, teachers with low expectations tend to:

Fail to give specific or positive feedback concerning the student's public response.
Pay less attention to and interact less frequently with the student.
Interact with the student more privately than publicly.
Engage in friendly interaction less often.
Smile less and limit encouraging physical touch.
Maintain eye contact less often.
Limit positive nonverbal communication reflecting attentiveness and responsiveness, including leaning forward, positive head nodding, and general supportive body language.

Note: I recieved this information from Donnie Smith