<span>The absolute threshold is the lowest intensity required and the difference threshold is the just noticeable difference between two stimuli. These thresholds differ by person, but usually have are defined as being able to be detected fifty percent of the time.</span>
Answer:
The first answer is right trust me
In a prominent model of self-administration developed by George Koob, rats are allowed to self-administer cocaine for either 1 hour each day (short access) or 6 hours each day (long access).
