I wonder whether this isn't the real basis for our reaction to the aliens, rather than the sense of mental intrusion to which it is usually ascribed?

He could feel the mental intrusion again, and knew that K'yorl understood him.

Although he can resist the mental intrusion he can't overcome the physical pain it inflicts on him.

Guenhwyvar's primal ferocity, however, allowed for no mental intrusions.

She felt that this mental intrusion was not dreamstuff but it had some of those characteristics.

The psychics considered uninvited mental intrusion against professional scruples.

There has been a mental intrusion.

For all the urgency of his call, he was nevertheless surprised when Aballister eagerly responded to his mental intrusions.

She thrust aside the mental intrusion and pulled her dagger.

"I've... had reason to learn to strengthen my shields against mental intrusion."