Is dypepsia a type of indigestion or not

Yes but it spelt as Dyspepsia and it is commonly known to children as an upset stomach.
It is a type of indigestion when the acid in your stomach reacts with certain mucosa. 

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later