What do cocaine, amphetamines, caffeine, nicotine, and MDMA (ecstasy) all have in common? Select one:

a.
They all increase the activity of the nervous system.

b.
They all cause hallucinations.

c.
They are all taken by people who want to relax or go to sleep.

d.
They are all very highly addictive both physically and psychologically.

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

Theoretical temperature at which molecules stop moving and no more heat can be removed from the object. kelvin: absolute zero degrees. none of the above.

Yummy, tasty, delicious