Difficulty: Introductory | Prerequisites: Basic neuroscience (reflexes, neurotransmitters)
This unit covers the major theories of how organisms learn: habituation, classical conditioning, operant conditioning, and observational learning. It is one of the most question-dense sections on the PSYCH 1100 final, with scenario after scenario asking you to classify a situation as positive reinforcement, negative punishment, a conditioned stimulus, and so on. The key to success here is knowing the precise definitions and being able to apply them to novel examples. If you can correctly label the components of Pavlov's experiment and distinguish the four quadrants of operant conditioning, you are well positioned.
Learning is a relatively permanent change in behaviour due to experience. Classical conditioning pairs stimuli so that a neutral stimulus eventually triggers a response on its own. Operant conditioning uses consequences (reinforcement and punishment) to increase or decrease behaviour. Observational learning happens by watching others.
Habituation
A decreased response to a repeated, harmless stimulus. Gabby initially cannot sleep due to dorm noise, but over time the noise stops bothering her. This is habituation.
In simple terms, you stop reacting to something because it keeps happening and nothing bad comes of it.
Sensitization
An increased response to a stimulus after repeated exposure (the opposite of habituation).
Reflex
An automatic, involuntary response to a stimulus. Becky's leg extending when tapped with a mallet at the doctor's office is a reflex.
Classical conditioning
A learning process in which a neutral stimulus becomes associated with a stimulus that naturally produces a response, so that the neutral stimulus eventually triggers the response on its own.
Unconditioned stimulus (UCS)
A stimulus that naturally and automatically triggers a response without any learning. In Pavlov's experiment, food is the UCS. In the Garcia and Koelling taste-aversion study, radiation is the UCS.
Unconditioned response (UCR)
The natural, unlearned response to the UCS. In Pavlov's experiment, salivation to food is the UCR. Becky blushing from embarrassment is an unconditioned response.
Neutral stimulus (NS)
A stimulus that initially produces no particular response. In Pavlov's experiment, the metronome (bell) starts as the neutral stimulus.
Conditioned stimulus (CS)
A previously neutral stimulus that, after being paired with the UCS, now triggers a learned response. After conditioning, the metronome becomes the CS. On Steve's first day at the office, the elevator bell was a neutral stimulus; after learning that it signals packages, it became a conditioned stimulus.
Conditioned response (CR)
The learned response to the conditioned stimulus. Salivation triggered by the bell alone (after conditioning) is the CR.
Acquisition
The initial learning phase in which the association between the CS and UCS is established. Tara's dog learning that the doorbell means a visitor has arrived is acquisition.
Extinction
The gradual weakening of a conditioned response when the CS is presented without the UCS.
Spontaneous recovery
The reappearance of a previously extinguished conditioned response after a period of rest. Jennifer's fear of bees had faded, but it returned when she encountered a swarm. That is spontaneous recovery.
Generalization (classical conditioning)
Responding to stimuli that are similar to the CS. Little Albert was conditioned to fear a white rat and then showed fear of other soft, fuzzy objects (rabbits). That is generalization.
Discrimination (classical conditioning)
Learning to respond only to the specific CS and not to similar stimuli. Winston does not salivate when his favourite restaurant's sign is off (the sign being off serves as a discriminative cue).
Latent inhibition
Difficulty conditioning a response to a familiar stimulus. Lisa had a long history of eating ice cream without getting sick, so it took her a long time to associate ice cream with nausea after becoming lactose intolerant.
Higher-order conditioning
A new neutral stimulus is paired with an existing conditioned stimulus (rather than with the UCS) to produce a new conditioned response.
Operant conditioning
Learning in which behaviour is strengthened or weakened by its consequences (reinforcement or punishment).
Positive reinforcement
Adding a desirable stimulus to increase a behaviour. Giving a dog a treat for doing a trick. A teacher saying "good job" after a correct answer. Ilana's mother giving her shopping money when she puts clothes away.
Negative reinforcement
Removing an unpleasant stimulus to increase a behaviour. Ron taking antacid to relieve stomach pain (removing the pain increases the behaviour of taking antacid).
Positive punishment
Adding an unpleasant stimulus to decrease a behaviour. Damien calling his sister a hated nickname when she bothers him. Spraying bad perfume in a roommate's room when she leaves the lights on. Slapping someone every time they leave their phone on during class.
Negative punishment
Removing a desirable stimulus to decrease a behaviour. Peter loses dessert for playing too many computer games. Taking away the iPad from fighting children. Taking away a friend's phone when they do not study.
Fixed-ratio schedule (FR)
Reinforcement is delivered after a set number of responses. Panera Rewards: free bagel after every 10 visits. Frequent flyer miles (1000 miles = 1000 points).
Variable-ratio schedule (VR)
Reinforcement is delivered after an unpredictable number of responses. Commission-based sales (Jim, Dwight, and Andy never know which conversation will result in a sale). This schedule produces the highest, most consistent response rates.
Fixed-interval schedule (FI)
Reinforcement is available after a set amount of time. Getting a paycheck every other week.
Variable-interval schedule (VI)
Reinforcement is available after an unpredictable amount of time. Waiting for shooting stars.
Observational learning
Learning by watching others. Albert Bandura's Bobo doll study is the classic example: children who watched an adult behave aggressively toward a Bobo doll were more likely to imitate that aggression.
Habituation: decreased response to a repeated, harmless stimulus (dorm noise, campus noise).
Sensitization: increased response to a repeated stimulus.
Habituation is NOT the same as sensory adaptation (which occurs at the receptor level, not the behavioural level).
Term | In Pavlov's experiment |
|---|---|
UCS | Food |
UCR | Salivation (to food) |
NS | Metronome (before conditioning) |
CS | Metronome (after conditioning) |
CR | Salivation (to metronome alone) |
Add stimulus (+) | Remove stimulus (-) | |
|---|---|---|
Increase behaviour | Positive reinforcement (add something pleasant) | Negative reinforcement (remove something unpleasant) |
Decrease behaviour | Positive punishment (add something unpleasant) | Negative punishment (remove something pleasant) |
Key tip: "positive" and "negative" refer to adding or removing, not to good or bad. "Reinforcement" always increases behaviour. "Punishment" always decreases behaviour.
Fixed ratio: every Nth response (Panera = every 10 visits, frequent flyer miles, teaching a dog to shake).
Variable ratio: unpredictable number of responses (sales commissions, slot machines).
Fixed interval: every set time period (biweekly paycheck).
Variable interval: unpredictable time periods (watching for shooting stars).
"Positive" does not mean good and "negative" does not mean bad. Positive = adding something. Negative = removing something.
Students often confuse negative reinforcement with punishment. Negative reinforcement increases behaviour by removing something unpleasant. Punishment decreases behaviour.
Students mix up the UCS and CS. The UCS works without learning (food naturally causes salivation). The CS only works after conditioning (the bell only causes salivation after being paired with food).
Habituation and sensory adaptation are different. Habituation is a learned behavioural change. Sensory adaptation is a change at the receptor level.
Spontaneous recovery is not the same as acquisition. Acquisition is the original learning. Spontaneous recovery is the return of an extinguished response after a rest period.
⚠️ The four-quadrant operant-conditioning table is the single most tested framework in this unit. Memorise it.
⚠️ Know the Pavlov matching: UCS = food, UCR = salivation, NS/CS = metronome, CR = salivation to metronome.
⚠️ The Panera Rewards question (10 visits = free bagel) = fixed-ratio schedule. It appears twice.
⚠️ Sales commission with unpredictable success = variable-ratio schedule.
⚠️ Biweekly paycheck = fixed-interval schedule.
⚠️ Habituation = Gabby sleeping through dorm noise. This appears in multiple variants.
⚠️ Little Albert generalizing fear to other fuzzy objects = generalization.
⚠️ Bandura's Bobo doll study = observational learning.
⚠️ Garcia and Koelling: radiation is the UCS in the taste-aversion study.
⚠️ Spontaneous recovery: Jennifer's bee fear returning after it had faded.
Fill in the blank: Adding an unpleasant stimulus to decrease a behaviour is called __________. Positive punishment.
True or False: Negative reinforcement decreases behaviour. False. Negative reinforcement increases behaviour by removing something unpleasant.
Fill in the blank: Panera giving a free bagel after every 10 visits is a __________ schedule. Fixed-ratio.
True or False: In Pavlov's experiment, the metronome is the unconditioned stimulus. False. The metronome is the neutral stimulus (before conditioning) and the conditioned stimulus (after conditioning). Food is the UCS.
Fill in the blank: Learning by watching others is called __________ learning, demonstrated by Bandura's __________ study. Observational; Bobo doll.
Q: Damien calls his sister a hated nickname every time she bothers him while he does homework. What type of operant conditioning is this?
A: Positive punishment. He is adding an aversive stimulus (the nickname) to decrease the unwanted behaviour (bothering him).
Q: Jim, Dwight, and Andy earn commission on sales but never know which customer conversation will lead to a sale. What schedule of reinforcement is this?
A: Variable-ratio schedule. Reinforcement (a sale) occurs after an unpredictable number of responses (customer conversations).
Q: Little Albert showed fear of soft, fuzzy objects after being conditioned to fear a white rat. What is this?
A: Generalization. His conditioned fear response spread to stimuli similar to the original conditioned stimulus.
Q: Jennifer's bee fear had faded, but it returned after she encountered a swarm. What is this?
A: Spontaneous recovery. A previously extinguished conditioned response reappeared after a period of rest.
Q: Ron takes antacid to reduce his stomach pain after overeating. What type of operant conditioning is this?
A: Negative reinforcement. Removing an unpleasant stimulus (stomach pain) increases the likelihood of the behaviour (taking antacid).
Classical conditioning connects to the Memory unit through encoding specificity and context-dependent learning: associations between stimuli and environments influence what we remember.
The stress unit uses the fight-or-flight response, which is essentially the UCR to a threatening stimulus (UCS).
Observational learning connects to the Development unit: children learn behaviours by watching parents and peers.
Schedules of reinforcement appear in discussions of addiction (variable-ratio schedules are particularly addictive, as with gambling).
learning, habituation, sensitization, reflex, classical conditioning, Pavlov, UCS, UCR, NS, CS, CR, acquisition, extinction, spontaneous recovery, generalization, discrimination, latent inhibition, higher-order conditioning, operant conditioning, positive reinforcement, negative reinforcement, positive punishment, negative punishment, schedules of reinforcement, fixed ratio, variable ratio, fixed interval, variable interval, observational learning, Bandura, Bobo doll, Garcia and Koelling, taste aversion, PSYCH 1100, general psychology, Ohio State