The minimal neural mechanisms that are jointly sufficient for consciousness (conscious percept, thought, memory, etc.) to occur, under constant background conditions, are called the neural correlates of consciousness (NCC) . The background conditions are enabling factors that must be present for the NCC to be able to function (e.g., the heart must beat ...
This review article  gives dopamine responses for rats (similar to the BBC article above) and includes references to the underlying studies:
Sex/Food: 150% - 300%
Alcohol/Ethanol: 190% (1g/kg) *
Morphine: 200% (1mg/kg) *
Nicotine: 220% (0.6mg/kg) *
Cocaine: 350% (5mg/kg)
Methamphetamine: 1000% (1mg/kg)
These are percentages of the baseline ...
From the source you provided, the answers seem to be outlined well from the authors' sentence that states:
The Pr [release probability] of SVs [synaptic vesicles] at the AZ [active zone] is set by a complex interplay of different presynaptic properties including the availability of release-ready SVs, the location of the SVs relative to the voltage-gated ...