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Classical Conditioning: Stimulus Control

This type of conditioning relies on:
stimulus (NS)
stimulus (US)
response (UR)
stimulus (CS)
response (CR)
Initially, does not elicit an intrinsic response Will elicit an unconditioned response Not learned, more biological Originally neutral
stimulus that is paired with a US
Learned response to the CS

Iwan Pawlow

When referring to this term, do physiologist P. Pawlow and the dog-bell-saliva-experiment directly cross your mind? The founder of the principle of classical conditioning accidentally came across the reaction-stimulus-chain, the so-called respondent model. He combined the action of feeding dogs with the sound of a bell and by and by he determined that the dogs already produced saliva by hearing the chime although no food was put in front of them.

The originally unconditioned stimulus (food) that led to an unconditioned reaction (salivation) was combined with a neutral impulse. By and by, this neutral impulse triggered the unconditioned reaction: the neutral impulse became the conditioned stimulus.

This conditioned reaction can also be deleted (extinction) by leaving out the conditioned impulse. If the impulse is set again spontaneously, the deleted reaction can appear again, however in a milder form (spontaneous recovery).

If similar impulses have the same reaction, we talk about stimulus-generalization. The term stimulus-discrimination, however, is used when similar impulses can be distinguished anyway.

Image: by Lecturio.

The process of classical conditioning includes:

  • Discrimination: When the CS is differentiated from other stimuli.
  • Generalization: Refers to when a stimulus other than the original CS elicits a CR.
  • Acquisition: Refers to the process of learning the CR.
  • Extinction: Occurs when the CS and US are no longer paired.
  • Spontaneous recovery: Is when an extinct CR occurs again when the CS is reintroduced.

Image by Lecturio

Operant Conditioning: Trial and Error

Bild: “ B.F. Skinner at  Harvard” von silly rabbit. Lizenz: CC BY-SA 3.0

Image: B.F. Skinner at Harvard. By silly rabbit, License: CC BY-SA 3.0

The US-American psychologist B.F. Skinner is inevitably associated with the term operant conditioning (Skinner-box see below). Operant conditioning describes the acquisition of stimulus-reaction-patterns:

How do we adjust our originally spontaneous behavior through reward and punishment?

The following terms are important with operant conditioning:

  • Positive reinforcement: The probability of certain behavior to occur increases through positive reinforcement.
  • Negative reinforcement: The discontinuation of negative impulses also leads to an increase in incidents.
  • Reinforcement: Positive or negative behavior consequences


  • Reinforcement = increase of behavior, regardless of whether positive or negative reinforcement
  • positive and negative are not judgmental
  • Positive: adding consequences
  • Negative: removing consequences

Skinner box: Equipment for animal testing with a fixed lever. If this is pushed, the rat will be rewarded with a food pill for its behavior. The behavior of the rat (pushing down the lever) is reinforced and so the action is executed more often. If the animals receive a painful stimulus after pushing the lever, they will stop this behavior after a little while.


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There are 4 important intermittent reinforcement schedules:

Fixed-ratio schedule Variable-ratio schedule Fixed-interval schedule Variable-interval schedule
Reinforce after a set number of instances of the behavior Reinforce an unpredictable number of instances of the behavior (i.e. gambling) Reinforce a set period that is Reinforce an inconsistent period

Differentiation of positive and negative reinforcement vs. punishment

The behavior consequence will be…

… added … removed
Positive reinforcement Positive strengthening (behavior increases) Punishment(behavior decreases)
Negative reinforcement Punishment (behavior decreases) Negative strengthening (behavior increases)

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Escape and Avoidance Learning
Escape Avoidance
Learn how to avoid an aversive stimulus by engaging in a particular behavior Perform a behavior to ensure the aversive stimuli is not encountered

More important terms and examples of operant conditioning

Term Definition Example
Primary reinforcement The satisfaction of primary needs Food, sleep, rest
Secondary reinforcement Linking to primary reinforcement (social, material, etc.) Praise, admiration, money
Emitted behavior Spontaneously occurring behavior that can be reinforced. Dog lifts its paw, gets rewarded, and repeats the behavior
Prompting Cue through initiating behavior externally Acquisition of language
Fading Gradual fading out of the prompts throughout the conditioning process Teacher gives tips to get the right answer and reduces the number of tips in the process.
Shaping Stepwise acquisition of complex behavior by rewarding consequences Toddler learns to tie shoes.
Chaining Learning complex chains of behavior, usually, the last element is reinforced 1st Brushing teeth: toothpaste on the brush, clean various areas, flush, use dental floss, etc.
Premack principle Linking of a less favorable activity with a popular one “First you have to eat the salad, then you’ll get the dessert!”

The reinforcement plans

Reinforcement plans are consistent relations between behavior and consequence = contingency.

The high contingency is given, when almost every behavior results in a consequence, whereas we speak of low contingency when consequences follow only occasionally. Continuous reinforcement means that every single desired behavior is strengthened. Intermittent reinforcement means that just a certain number of all desired behavior is strengthened. The distinction is drawn between ratio plans and interval plans:

Fixed ratio plans Consequence after fixed-rate, e.g., every 3rd time
Variable ratio plans Consequence after variable rate, e.g., after the 2nd, then the 5th, then the 10th time
Fixed interval plans Consequence after a fixed time interval, e.g., every 5 minutes
Variable interval plans Consequence after a variable time interval, e.g., after 5, then after 10, and then after 15 minutes

Important: While continuous reinforcement leads to fast learning, skills are more resistant to erasing if reinforcement occurs intermittently.

Learning by Understanding: Cognitive Learning

Learning by understanding means that we come to a solution by understanding the circumstances. Hence, the person gets to a solution through pure reflection, not through an outward visible and observable experience. The ‘light bulb moment’ falls in this category of learning by understanding: a sudden flash of inspiration leads to understanding and solution-oriented behavior respectively. This approach can then be extrapolated to other situations (e.g., math problem).

Model-based Learning: Observational Learning

Note: Observational learning is also known as social learning or vicarious learning.

Behavior is learned with potentially positive or negative consequences using a model: Other people are observed and their behavior is imitated and learned in this manner. Consequently, there’s neither reinforcement nor consequences for the observer.

Many pro- and antisocial behaviors become conceivable through observational learning.


  • Fear of spiders or mice that are conveyed through media and social environment (parents, siblings)
  • Xenophobia
  • Cooperativeness

Biological processes that affect observational learning

Mirror neurons are found in several brain regions including:

  • Premotor cortex
  • Primary somatosensory cortex
  • Inferior parietal cortex

These neurons fire when a task is performed and/or when that same task is observed. They are thought to help us understand the action of others, help us learn through imitation, and are potentially responsible for vicarious emotions such as empathy.

Learning by Self-control

Behaviors are learned by initial model-based learning and operant conditioning. Based on this, we create our expectation-patterns for ourselves. The intrinsic factors of self-control, self-criticism, and self-confirmation now replace outside reinforcement and punishment.

Example: Child is taught that leisure activities can only be enjoyed after achieving something. As adults, such people only take a break if their self-imposed work plan for the day is met, otherwise they do not.

Habituation, De-habituation, and Sensitization

Habituation Adaptation to a recurrent impulse. The intensity of reaction decreases with repetition (though no habituation to pain). Contact lenses, tactile impulses of clothing
De-habituation ‘Weaning from habituation’ – recurrence of the reaction after habituation through an interspersed, different impulse. If the permanent siren sound of an ambulance suddenly changes, then we notice the already faded out sound again.
Sensitization Opposite of habituation – increase in reaction intensity, which increases with repetition.

Theories of Attitude and Behavior Change

The elaboration likelihood model is a dual process theory describing changes in attitude and behavior.

Key elements of persuasiveness

Message characteristics Source characteristics Target characteristics
Logic and number of key points, length, and grammatical complexity Level of expertise, knowledge, and trustworthiness Of the person receiving the message like self-esteem, intelligence, mood

Elaboration likelihood model

The model proposes 2 major routes for persuasion:

  • Central route — people are persuaded by the content of the argument
  • Peripheral route — focus on superficial or secondary characteristics

People will choose the central route only when they are both motivated and not distracted. Processing via the central route will have longer-lasting persuasion vs. peripheral route.

Social cognitive Theory

The social-cognitive perspective incorporates elements of cognition, learning, and social influence. Social cognitive theory is a theory of behavior change that emphasizes the interaction of people and their environment. Social factors, observational learning, and environmental factors can influence attitude change.

Reciprocal determination is an interaction between a person’s behavior, personal factors, and environment (situational factors). Three ways that individuals and environments interact:

  • Individuals choose their environment which in turn shapes them (i.e. neighborhood, campus)
  • Personality shapes how individuals interpret and respond to their environment
  • Individual’s personality influences the situation to which they then react to

Clinical Reference: Application of Learning Models in Therapies

Step 1: Development of fear

Behavior therapy is especially used with an anxiety disorder (phobia). Classical conditioning processes play a major role in the development of fear, whereas sustainability is achieved by operant conditioning. The linking of stimulus and reaction (such as fear of black cars, winding up in an accident) can be sustained for years by avoiding the anxiety-inducing stimulus.

Step 2: Analysis of behavior

A therapist would create an analysis of behavior with the SORCC-Model, e.g., the fear of black cars.

S: Stimulus – sight of black cars; O: Organism – negative experience with black cars in childhood; R: Reaction – strong anxiety, avoidance, and stimulus control; C: Contingency – power of the connection between R and C; C: Consequence -easing of fear through avoidance (negative reinforcement). If the therapist makes a clear diagnosis with regard to the circumstances of the fear, he will try to initiate a behavior modification. Erasing of fear can be achieved if the affected person confronts the object of fear and recognizes that it doesn’t pose any danger. To this end, confrontation therapies are applied.

Step 3: Confrontation procedure

Systematic desensitization

The systematic desensitization describes a procedure in 3 steps:

  • Relaxation training: learning to consciously relax in situations of fear, e.g., with progressive muscle relaxation technique (according to Jacobson)
  • Fear hierarchy: rank situations depending on the threat level
  • Confrontation in situ or in vivo: In the relaxed condition, the patient is presented with confrontation situations at various levels of the fear hierarchy until the patient can stay relaxed while being confronted with the object of fear at the highest level.


Stimulus saturation is no stepwise process but presents a sudden, intense confrontation with the object of fear/situation of fear. Flooding shall prove to the afflicted person that there is no real danger to expect from the stimulus.


Cognition is perceived (lat. cognoscere = experience, recognize) as the complex, comprising perception, consciousness, thinking, recognition, and memory.

Attention and perception

Attention: Heightened vigilance and selective focus of perception, thinking, and action = condition of intense consciousness.

Perception: We gain information about the outer and the inner world through perception. Exteroception is the term for the perception of the environment through the senses and interoception stands for the inner perception of physiological processes.

Perception can be selective, strengthened, subliminal, or impaired. Perception disorders include:

  • Agnosia: sensory organs are intact; the patient, however, is unable to recognize the perception (e.g., ‘apple’ is described as a round red thing)
  • Prosopagnosia: faces cannot be recognized


Multistore model

Image: Multistore model. By Zorkun, License: CC BY-SA 3.0

Memory can save information (encoding) and later to reproduce (decoding) or recognize it. We distinguish sensory memory, short-term, and long-term memory. Keeping information is called retention.

  • Sensory memory (ultra-short-term memory): visual impulses of the environment are saved in the iconographic memory for 1 second and auditory information in the echoic memory for 2 seconds.
  • Short-term memory: ‘interstatio’ a part of the information is taken out of the sensory memory and if necessary transferred to the long-term memory: 7 +/- 2 elements can be kept up to 20 seconds.
  • Long-term memory: retention for minutes to years.

Subdivision of the long-term Memory

Note: The episodic memory is responsible for the knowledge about our phases of life; the semantic memory is our memory for facts.

Amnesia and memory disorders

Most important forms of amnesia

Anterograde amnesia Memory gaps in the period after the harmful incident (e.g. Polytrauma)
Retrograde amnesia Memory gaps in the period before the harmful incident
Dissociative amnesia Sudden inability to remember (mostly upsetting) incidents or information

Most important memory disorders

  • Korsakow-Syndrome: Persistent amnesic disorder caused by alcoholism, marked with extreme confusion, neurologic abnormalities, and confabulation (memory gaps are re-recorded with imaginary stories).
  • Dementia: Loss of brain functions including memory. Reasons for dementia can be alcohol, drug abuse, or brain lesions like strokes. The degenerative disease of Alzheimer‘s makes up the bulk of dementia.
  • Perseveration: Persistence on certain memory contents, repetition of thoughts, and language contents (reason: fatigue, drugs, and degeneration).

Speech and Language

We use language for interpersonal communication of thoughts, desires, and feelings, and hereby use many symbols. Broca area and Wernicke area are responsible for language generation and speech comprehension. Central speech disorders are defined as aphasia. We talk about global aphasia if both, speech comprehension, and language production are impaired.

Function Localization Aphasia
Broca area Language production Frontal convolutions of the dominant hemisphere (on the left side for right-handers) Motor, expressive aphasia (speech comprehension is intact)
Wernicke area Speech comprehension The parietal frontal lobe of the dominant hemisphere Sensory, recipient aphasia (speech comprehension is impaired)
Broca’s and Wernicke’s Areas

Image: Broca’s and Wernicke’s areas. By Phil Schatz, License: CC-BY 4.0

Theories of language development

Language acquisition is the process by which children learn to understand and speak their native language. Theories used to explain language development include:

  • Nativist theory
  • Empiricist theory
  • Behaviorist theory

Nativist theory by Noam Chomsky

  • This suggests all children have an innate language activation device (LAD).
  • LAD is an area of the brain that has a set of universal syntactic rules for all languages
  • The idea was later renamed Universal grammar (UG).
  • LAD provides children with the ability to construct novel sentences using learned vocabulary.
  • Linguistic input alone is insufficient to explain how they learn a language.
  • Certain rules must be innate in the brain (i.e. nouns, verbs, and adjectives).


  • General brain processes are sufficient for language acquisition, LAD is not needed.
  • Child needs to be actively engaged in the environment.
  • Parents or caregivers will interact using child-directed speech (CDS).

Behaviorist theory by B.F. Skinner

  • Suggests language acquisition through operant conditioning.
  • Uses positive reinforcement when imitating stimuli and correct responses.

Positive reinforcement accomplishes:

  • Conditions infant to make the sound associations with the stimulus.
  • Encourages imitative behavior

Influence of language on cognition

Language development has 3 stages:

Stage 3 Understanding of grammar and relationship; ‘inner speech’
Stage 2 Talking to themselves, experimenting; ‘egocentric or private speech’
Stage 1 Immersion in ‘social speech’
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