What is the responding variable? A. The size of the apple wedge
B. The liquid the apple wedges were dipped in
C. The color of the apple wedges after 1 hour
D. The lemon juice applied to one of the apple wedges

B the liquid in the apple wedges were dipped in

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