As Saguy explains, “When a woman believes that a man is focusing on her body, she narrows her presence… by spending less time talking.” There are a few possible reasons for this. Saguy suspects that objectification prompts women to align their behaviour with what’s expected of them – silent things devoid of other interesting traits. Treat someone like an object, and they’ll behave like one. Alternatively, worries about their appearance might simply distract them from the task at hand.

via How objectification silences women – the male glance as a psychological muzzle : Not Exactly Rocket Science.