Classical and operant conditioning are the two types of __________ learning

The weakest amount of stimulus that can be sensed is _____ threshold

Fill in the blank(s) with the appropriate word(s).

The "all-or-none" law is the principle stating that ______

a. a neuron must be receiving only "fire" messages through its dendrites or it will not fire at all b. all the neurons in a particular area of the brain fire simultaneously or not at all c. a neuron fires at full strength or not at all d. all neurons in an area fire at the same intensity or not at all