The first and the third stories in this trilogy of novella's share a a somewhat related theme are are the stars of the collection.
In the first "To Marry Medusa", a collective consiousness of humankind is triggered by an alien hive mind attempting to absorb humanity into it's self.
In the last ""The [WIDGET:], the [WADGET:] and Boff", an alien experiment on humans to trigger an almost dormant function of the brain is the subject. This function is an instinctive reflex that taps into the collective consciousness of humankind.
Once again I am astounded by Sturgeon's boundless imagination and vision. He set a high standard for SF which, unfortunately, was rarely lived up to by those that followed.