-A type of classical conditioning in which a subject is presented with a light or sound paired with a brief aversive stimulus such as a mild electrical shock. After multiple trials, subjects will experience fear responses such as cardiac and respiratory changes when only light or sound is presented. 

-Studies of fear conditioning have shown that the amygdala is the key structure that mediates fear.

Fear Conditioning

A neutral stimulus (NS) is a stimulus that does not naturally elicit the target response before conditioning begins. This is because the organism has no prior learned association with the stimulus that would trigger that specific reaction. For instance, before Pavlov's experiment, the sound of a tone was a neutral stimulus to the dogs, as it did not cause them to salivate.

Neutral Stimulus (NS)

An unconditioned stimulus (UCS) is a stimulus that triggers a reflexive, unlearned response in an organism. In Pavlov's experiments, the meat powder served as the UCS because it naturally caused the dogs to salivate without any prior training.

Unconditioned Stimulus (UCS)

It is useful to consider the phases before, during, and after conditioning.

Before, During, and After Classical Conditioning

A dog owner uses an electric can opener to open their dog's food every day. The sound of the can opener running makes the dog excited and start to salivate. Eventually, the dog gets excited and salivates whenever it hears the sound of any electric appliance running in the kitchen, even if it is not the can opener. In this scenario, the sound of the electric can opener is the:

- Unconditioned stimulus (US): stimulus that produces an automatic response without prior conditioning


- Unconditioned response (UR): unconditioned reaction automatically elicited by the unconditioned stimulus


- Neutral stimulus (NS): a stimulus that elicits no response before conditioning


- Conditioned stimulus (CS): a previous NS that elicits a conditioned response after being paired with the US


- Conditioned response (CR): the learned response to the conditioned stimulus after the CS and US are paired


(Spielman 2020)

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Behavioral Neuroscience connections and research related to Anxiety Disorders can be broken down into the following concepts or topics:
-	Conditioning
-       TBD (Add more as needed)

Behavioral Neuroscience Related to Anxiety Disorders

Classical conditioning is a type of associative learning in which organisms learn to connect events that repeatedly happen together. Through this process, a reflexive response originally elicited by one stimulus can be mapped to a different stimulus by training an association between the two.

Classical Conditioning

Classical conditioning involves pairing one stimulus with a previously neutral stimulus, which causes a change in response to a neutral stimulus.

- Camina, E., Güel, F. (2017). The Neuroanatomical, Neurophysiological and Psychological Basis of Memory: Current Models and Their Origins. Front. Pharmacol. 8:438. doi: 10.3389/fphar.2017.00438

- Kreitzer, A. C. (2009). Physiology and pharmacology of striatal neurons. Annu. Rev. Neurosci. 32, 127–147. doi: 10.1146/annurev.neuro.051508.135422

- Spielman, R. M, et. al. (2020). Psychology 2e. OpenStax.

- Mackintosh, J. N. (1999). Classical and instrumental conditioning. Encyclopedia Britannica.

- McLeod, S. A. (2018, August 21). Classical conditioning. Simply Psychology. www.simplypsychology.org/classical-conditioning.html

References for implicit memory

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Kindt, Merel. (2014). A behavioural neuroscience perspective on the aetiology and treatment of anxiety disorders, 62, 24-36. http://dx.doi.org.libproxy.scu.edu/10.1016/j.brat.2014.08.012 

A behavioural neuroscience perspective on the aetiology and treatment of anxiety disorders

Classical Conditioning: Terms

1) Pavlov presented his  dogs with the sound of a bell (NS) which did not elicit any response


2) Started to pair the sound of the bell (NS) with food (US), which did elicit an unconditioned response (salivation)


3) After repeated presentation, the sound of the bell alone (now the CS) made the dogs salivate (CR) 

(McLeod 2018)

Ivan Pavlov's dogs

Extinction is the process in classical conditioning where a learned response diminishes and eventually vanishes. This occurs when the conditioned stimulus (CS) is repeatedly presented without the unconditioned stimulus (UCS). As the association between the two stimuli weakens, the organism's conditioned response (CR) becomes progressively weaker until it ceases entirely. For instance, Pavlov observed this when he repeatedly sounded a tone for his dogs without providing meat powder, which led to the dogs eventually stopping their salivation response to the tone.

Extinction

Acquisition is the initial learning phase in classical conditioning where a neutral stimulus is repeatedly paired with an unconditioned stimulus. With each pairing, the strength of the conditioned response increases. This process of repeated association gradually transforms the neutral stimulus into a conditioned stimulus, which can then elicit the conditioned response on its own.

Acquisition

Can a behavior be conditioned if the neutral stimulus is presented after the unconditioned stimulus?

Spontaneous recovery is the re-emergence of a conditioned response that had previously been extinguished. This phenomenon occurs after a rest period during which the conditioned stimulus is not presented. For example, Pavlov observed that after his dogs underwent extinction training and stopped salivating to a bell, they would once again begin to salivate at the sound of the bell following a few hours of rest.

Spontaneous Recovery

An example of classical conditioning can be seen during a thunderstorm. A person naturally jumps (a reflex) in response to a loud boom of thunder. If a flash of lightning consistently precedes the thunder, the person may learn to associate the two stimuli. Consequently, they may begin to jump at the sight of lightning alone, in anticipation of the thunder.

Classical Conditioning: Lightning and Thunder

A real-world example of classical conditioning can be seen in cancer patients undergoing chemotherapy. For instance, a patient named Moisha vomited after her treatments. The chemotherapy drugs were the unconditioned stimulus (UCS) that caused the unconditioned response (UCR) of vomiting. After repeated visits, the doctor's office, which was previously neutral, became a conditioned stimulus (CS). Consequently, Moisha began to feel nauseous—the conditioned response (CR)—simply upon visiting the oncologist's office, even before receiving treatment.

Classical Conditioning in Chemotherapy Patients

A common example of classical conditioning involves a cat named Tiger. The cat's food serves as the unconditioned stimulus (UCS), which naturally elicits excitement as the unconditioned response (UCR). A specific electric can opener, used only for the cat's food, makes a distinct sound. This sound, initially a neutral stimulus, becomes a conditioned stimulus (CS) after being repeatedly paired with the food. Consequently, Tiger learns to get excited and run to the food preparation area—the conditioned response (CR)—upon hearing the sound of the can opener alone.

Classical Conditioning in a Cat

At Stingray City in the Cayman Islands, southern stingrays provide a real-world example of classical conditioning. The process began when fishermen regularly cleaned fish and conch (unconditioned stimulus) at a sandbar, causing stingrays to gather to eat (unconditioned response). Over the years, the stingrays learned to associate the sound of boat engines, initially a neutral stimulus, with this food source. As a result, the engine noise became a conditioned stimulus, prompting a conditioned response where dozens of stingrays now swarm tour boats, bumping and rubbing against people in anticipation of being fed treats like squid. This response is maintained by the presence of food, as the stingrays leave once the treats are gone.

Classical Conditioning in Stingrays

An example of classical conditioning in infants involves a six-month-old named Angelina and her baby formula. The formula is an unconditioned stimulus (UCS) that naturally elicits excitement and salivation as an unconditioned response (UCR). Initially, the blue canister containing the formula is a neutral stimulus. Through repeated association with the formula, Angelina learns that the canister signals feeding time. Consequently, the canister becomes a conditioned stimulus (CS), and the sight of it alone is enough to trigger a conditioned response (CR), such as excitement and reaching for the container.

Classical Conditioning in an Infant with a Formula Canister

Classical conditioning is not limited to food-related stimuli and can be used to condition emotional responses like fear. For instance, in the case of an invisible electric dog fence, a dog learns to associate the edge of the yard (a neutral stimulus) with the discomfort of a small electrical shock (an unconditioned stimulus). After this pairing, the edge of the yard becomes a conditioned stimulus that elicits fear and anxiety (the conditioned response), compelling the dog to stay within the designated boundaries.

Classical Conditioning with an Electric Dog Fence

A humorous example of classical conditioning is depicted in the television show *The Office*. In the scene, a character named Jim conditions his coworker, Dwight, by repeatedly making a specific computer sound before offering him a breath mint. After several pairings, the sound alone, which was initially a neutral stimulus, becomes a conditioned stimulus, causing Dwight to automatically expect a mint, demonstrating a conditioned response.

Classical Conditioning in 'The Office'

Robert Rescorla was a prominent researcher who, along with his colleague Allan Wagner, significantly advanced the understanding of classical conditioning. He demonstrated that the predictive power of a conditioned stimulus (CS) over the occurrence of an unconditioned stimulus (UCS) is a critical factor in the learning process. Their work culminated in the development of the Rescorla-Wagner model.

Robert Rescorla

In classical conditioning, a neutral stimulus (NS) is a stimulus that does not naturally elicit a response prior to conditioning. During the conditioning process, it is presented immediately before an unconditioned stimulus.

Neutral Stimulus

In classical conditioning, a conditioned stimulus is an initially neutral stimulus that eventually triggers a response after being repeatedly paired with an unconditioned stimulus. For example, after Ivan Pavlov repeatedly paired a tone with meat powder, the tone became a conditioned stimulus because it began to independently elicit salivation from the dogs.

Conditioned Stimulus

A classic example of classical conditioning involves a dog, food, and a bell. Before conditioning, the dog naturally salivates to food but not to a ringing bell. During conditioning, the bell is rung whenever food is presented. After conditioning, the dog learns to associate the bell with the food and begins salivating to the bell alone.

Pavlov's Dog Experiment

Classical conditioning frequently occurs in real-world medical situations, such as cancer chemotherapy. Chemotherapy drugs act as an unconditioned stimulus that naturally produces vomiting, the unconditioned response. Through repeated pairings, the doctor's office becomes a conditioned stimulus. Consequently, visiting the office alone can trigger a conditioned response of nausea.

Classical Conditioning of Nausea in Cancer Patients

Higher-order conditioning, or second-order conditioning, occurs when an established conditioned stimulus is paired with a new neutral stimulus, causing the new stimulus to also elicit the conditioned response. For example, if a doctor's office is already a conditioned stimulus that triggers nausea, learning to associate a syringe with the doctor's office can cause the syringe alone to produce nausea, even if it was never directly paired with the original unconditioned stimulus.

Higher-Order Conditioning

An example of classical conditioning occurs when a cat repeatedly hears the sound of an electric can opener before being fed. Over time, the cat associates the sound with receiving food, causing it to become excited and run to the feeding area whenever it hears the can opener alone.

Classical Conditioning Cat Example

The southern stingrays at Stingray City provide a real-world example of classical conditioning. Over time, these normally solitary animals became accustomed to interacting with humans and learned to associate the sound of a boat engine with food. Much like Pavlov's dogs, the stingrays learned that a neutral stimulus (boat engine sound) predicted an unconditioned stimulus (food), eventually leading to a conditioned response.

Stingray City Classical Conditioning Example

Taste aversion is an evolutionary adaptation designed to help organisms quickly learn to avoid harmful foods. This form of conditioning is unique because it can occur based on a single instance and involve an extended time lapse between the event (consuming the food) and the negative stimulus (illness). This rapid learning contributes to species survival via natural selection by helping organisms avoid stimuli that pose real dangers to their health and welfare.

Evolutionary Adaptation of Taste Aversion

In classical conditioning, extinction is the decrease in the conditioned response when the unconditioned stimulus is no longer presented with the conditioned stimulus. Over time, as the conditioned stimulus is repeatedly presented alone, the organism's response gradually weakens and eventually disappears.

Extinction (Classical Conditioning)

A chart illustrates the four main stages of classical conditioning over time. The x-axis represents time, and the y-axis represents the strength of the Conditioned Response (CR). The four columns of graphed data represent Acquisition, Extinction, a Pause, and Spontaneous Recovery followed by further Extinction.

Classical Conditioning Stages Graph

In 1920, John B. Watson and Rosalie Rayner conducted an experiment with a baby nicknamed Little Albert. They demonstrated that fears can be conditioned by exposing Little Albert to a neutral white rat and repeatedly pairing it with a sudden, loud noise. The loud noise naturally caused a reflexive fear response. Eventually, Little Albert became frightened by the white rat alone, showing that emotions could become conditioned responses.

Little Albert Experiment

Ivan Pavlov's experiments demonstrated that classical conditioning is the process through which stimulus-response bonds are formed. This occurs when an organism learns to associate two events that repeatedly happen together, causing a reflexive response to one stimulus to become associated with a different, previously neutral stimulus.

Stimulus-Response Bonds in Classical Conditioning

Habits form by repeating behaviors or actions after certain contextual cues. In repeating these actions, dependence on conscious motivation for performing the actions is reduced. The consistent repetition of actions over the period of 60+ days forms habits.

Formation of Habits

Stimulus generalization occurs when an organism elicits a conditioned response to stimuli that are similar, but not identical, to the original conditioned stimulus. This process is the opposite of stimulus discrimination. The likelihood of the conditioned response appearing is proportional to the similarity between the new stimulus and the conditioned stimulus; the more alike they are, the stronger the response.

Stimulus Generalization

Stimulus discrimination is a learning process where an organism learns to respond differently to various similar stimuli. In the context of classical conditioning, this means the organism exhibits the conditioned response only to the specific conditioned stimulus, not to other stimuli that may be similar but do not signal the unconditioned stimulus. This ability to distinguish between predictive and non-predictive stimuli is crucial for appropriate responses, such as recognizing sounds that signal a threat versus those that do not.

Stimulus Discrimination

Higher-order conditioning, also known as second-order conditioning, occurs when an established conditioned stimulus is used to condition a new, neutral stimulus. In this process, the original conditioned stimulus effectively acts like an unconditioned stimulus for the new association. However, achieving conditioning beyond this second level is generally difficult, and the learned response is often weaker.

Higher-Order Conditioning (Second-Order Conditioning)

Classical conditioning involves several key processes that describe how a conditioned response is learned and modified:

*   **Acquisition**: The initial stage of learning where a neutral stimulus is paired with an unconditioned stimulus to elicit a conditioned response.
*   **Extinction**: The gradual weakening and disappearance of a conditioned response when the conditioned stimulus is repeatedly presented without the unconditioned stimulus.
*   **Spontaneous Recovery**: The reappearance of an extinguished conditioned response after a period of rest.
*   **Stimulus Generalization**: The tendency for stimuli similar to the conditioned stimulus to elicit a similar conditioned response.
*   **Stimulus Discrimination**: The ability to differentiate between the conditioned stimulus and other stimuli that have not been paired with the unconditioned stimulus.

Key Processes in Classical Conditioning

The principles of classical conditioning are applied in various domains to understand and influence behavior. Key areas of application include explaining learned emotional responses like fear, developing therapies for anxiety disorders, and creating positive associations in advertising to promote products. It also provides a framework for understanding aspects of language acquisition, as explored in Relational Frame Theory (RFT).

Applications of Classical Conditioning

The Little Albert experiment, conducted by John Watson and Rosalie Rayner in 1920, is an influential case study in the history of psychology. The researchers repeatedly paired a loud noise with the approach of a white rat, which taught the young child to fear the rat along with other furry objects. This detailed observation of a single individual demonstrated how emotional responses could be conditioned.

The Little Albert Experiment

In classical conditioning, acquisition is the initial period of learning when an organism learns to connect a neutral stimulus and an unconditioned stimulus.

Acquisition in Classical Conditioning

Timing is crucial for classical conditioning to occur. Typically, there must be only a brief interval between the presentation of the conditioned stimulus and the unconditioned stimulus.

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