Match each abbreviated term with the correct definition.
terms:
1. ucr
2. ucs
3. cr
4. cs
5. ns
definitions:
a. a naturally occurring trigger that leads to a natural response
b. a natural response to the unconditioned stimulus
c. stimulus that becomes able to produce a learned response by being paired with the original unconditioned stimulus
d. learned response to a conditioned stimulus
e. stimulus that has no effect on the desired response, but gains its power through the pairing with the ucs. it eventually becomes known as the cs.

See explanation below.

Explanation:

Conditioning learning is an style of learning where a conditioned stimulus is associated with an unconditioned stimulus and they produce a conditioned behavioral response.

(1) In this learning, at first, the unconditioned stimulus (UCS) is an stimulus that produces a response by itself in a natural way, thus, the UCS acts as a naturally occurring trigger that leads to a natural response.

(2) This natural response that the UCS triggers is called the unconditioned response (UCR), thus, the UCR is a natural response to the unconditioned stimulus.

(3) The conditioned stimulus (CS) is what comes next in the process, and this is an stimulus  that does not create a response on its own but when it's paired with the UCS, and after some repetitions, it creates a response which is learned. Thus, the CS is an stimulus that becomes able to produce a learned response by being paired with the original unconditioned stimulus.

(4) This conditionally learned response that was learned because of said pairing is called conditional response (CR), thus the CR is a learned response to a conditioned stimulus.

(5) We said in paragraph (3) that the conditioned stimulus did not create a response on its own but once it's paired with the UCS it creates a learned behavior.

Well, originally, the CS can be considered a neutral stimulus (NS), a neutral stimulus is one stimulus that doesn't have an effect on what we are trying to make the subject learn but that with time, repetitions and pairing with UCS, transforms into the conditioned stimulus. Thus the NS is an stimulus that has no effect on the desired response, but gains its power through the pairing with the UCS. It eventually becomes known as the CS.

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;