Given that log n = -a, derive an expression for n the antilogarithm in scientific location.

Some people, by convention, use log to mean base 10. If that is the case then N = 10^-a

If we do not know the base, we can call it b and thus
N = b^-a

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