Drive Reduction Theory and Human Behavior

Key Takeaways

  • Drive reduction theory says our actions aim to balance our body’s needs like hunger or thirst.
  • Hull’s theory was important for understanding how physical needs can motivate behavior, but it has been replaced by new ideas.

Drive reduction theory suggests that behavior is motivated by the need to reduce physiological imbalances or ‘drives.’ It is based on the idea of homeostasis, or the need to maintain a steady state. When people experience drives such as thirst or hunger, they are motivated to take actions that will restore the balance and return them to a state of equilibrium.

The drive reduction theory of motivation became popular during the 1940s and 1950s as a way to explain behavior, learning, and motivation. The theory was created by behaviorist Clark Hull and further developed by his collaborator Kenneth Spence. According to the theory, the reduction of drives is the primary force behind motivation.

While the drive reduction theory of motivation was once a dominant force in psychology, it is largely ignored today. Despite this, it’s worthwhile for students to learn more about Hull’s ideas to understand his work’s effect and see how other theorists responded by proposing their own theories.

This article explores how drive reduction theory works, criticisms of Hull’s theory, and a few alternative motivational theories that have been proposed.

Overview of Drive Reduction Theory

Hull was one of the first theorists to attempt to create a grand theory designed to explain all behavior. He started developing his theory shortly after he began working at Yale University, drawing on ideas from a number of other thinkers including Charles Darwin, Ivan Pavlov, John. B. Watson, and Edward L. Thorndike.

Hull based his theory on the concept of homeostasis, the idea that the body actively works to maintain a certain state of balance or equilibrium. For example, your body regulates its temperature in order to ensure that you don’t become too hot or too cold. Hull believed that behavior was one of the ways that an organism maintains this balance.

Based on this idea, Hull suggested that all motivation arises as a result of these biological needs. In his theory, Hull used the term drive to refer to the state of tension or arousal caused by biological or physiological needs. Thirst, hunger, and the need for warmth are all examples of drives. A drive creates an unpleasant state, a tension that needs to be reduced.

In order to reduce this state of tension, humans and animals seek out ways to fulfill these biological needs. We get a drink when we are thirsty. We eat when we are hungry. We turn up the thermostat when we are cold. He suggested that humans and animals will then repeat any behavior that reduces these drives.

Conditioning and Reinforcement

Hull is considered a neo-behaviorist thinker, but like the other major behaviorists, he believed that human behavior could be explained by conditioning and reinforcement.

According to Hull, the reduction of the drive acts as a reinforcement for that behavior.

This reinforcement increases the likelihood that the same behavior will occur again in the future when the same need arises. In order to survive in its environment, an organism must behave in ways that meet these survival needs.

“When survival is in jeopardy, the organism is in a state of need (when the biological requirements for survival are not being met) so the organism behaves in a fashion to reduce that need,” Hull explained.

In a stimulus-response (S-R) relationship, when the stimulus and response are followed by a reduction in the need, it increases the likelihood that the same stimulus will elicit the same response again in the future.

Hull’s Drive Reduction Formula

Hull’s goal was to develop a theory of learning that could be expressed mathematically, to create a “formula” to explain and understand human behavior.

Mathematical Deductive Theory of Behavior

sEr = V x D x K x J x sHr – sIr – Ir – sOr – sLr

  • sEr: Excitatory potential, or the likelihood that an organism will produce a response (r) to a stimulus (s)
  • V: Stimulus intensity dynamism, meaning some stimuli will have greater influences than others
  • D: Drive strength, determined by the amount of biological deprivation
  • K: Incentive motivation, or the size or magnitude of the goal
  • J: The delay before the organism is allowed to seek reinforcement
  • sHr: Habit strength, established by the amount of previous conditioning
  • slr: Conditioned inhibition, caused by previous lack of reinforcement
  • lr: Reactive inhibition, or fatigue
  • sOr: Random error
  • sLr: Reaction threshold, or the smallest amount of reinforcement that will produce learning

Hull’s approach was viewed by many as overly complex, yet at the same time, critics suggested that the drive reduction theory failed to fully explain human motivation. His work did, however, have an influence on psychology and future theories of motivation.

Criticism of Drive Reduction Theory

While Hull’s theory was popular during the middle part of the 20th century, it began to fall out of favor for a number of reasons. Starting as early as the 1950s, critics began pointing out the flaws in the drive reduction approach.

Lack of Generalizability

Because of his emphasis on quantifying his variables in such a narrowly defined way, his theory lacks generalizability.

However, his emphasis on rigorous experimental techniques and scientific methods did have an important influence on the field of psychology.

Does Not Address Secondary Reinforcers

One of the biggest problems with Hull’s drive reduction theory is that it does not account for how secondary reinforcers reduce drives.

Unlike primary drives such as hunger and thirst, secondary reinforcers do nothing to directly reduce physiological and biological needs. Take money, for example. While money does allow you to purchase primary reinforcers, it does nothing in and of itself to reduce drives. Despite this, money still acts as a powerful source of reinforcement.

Does Not Fully Explain Behavior

Another major criticism of the drive reduction theory of learning is that it does not explain why people engage in behaviors that do not reduce drives. For example, people often eat when they’re not hungry or drink when they’re not thirsty.

In some cases, people actually participate in activities that increase tension such as sky-diving or bungee jumping. Why would people seek out activities that do nothing to fulfill biological needs and that actually place them in considerable danger? Drive reduction theory cannot account for such behaviors.

Impact of Drive Reduction Theory

While Hull’s theory has largely fallen out of favor in psychology, it is still worthwhile to understand the effect it had on other psychologists of the time and how it helped contribute to later research in psychology.

In order to fully understand the theories that came after it, it’s important for students to grasp the basics of Hull’s theory.

For example, many of the motivational theories that emerged during the 1950s and 1960s were either based on Hull’s original theory or were focused on providing alternatives to the drive reduction theory.

Alternatives to Drive Reduction Theory

Other theories of motivation that have been proposed include:

  • Arousal theory suggests that people are motivated to engage in behaviors to maintain a certain level of physiological arousal. The ideal level varies from person to person, leading people to seek stimulation or relaxation depending on what they need.
  • Maslow’s hierarchy of needs emerged as an alternative to Hull’s approach. and suggests that human behavior is motivated by certain physiological and psychological needs. These needs begin with the most basic and progress to more complex ones.
  • Incentive theory proposes that behaviors are motivated by external incentives. It suggests that what we do is directly influenced by external rewards. For example, you study to get a good grade or put in extra effort at work to receive a bonus.
  • Self-determination theory suggests that people are motivated by the need to experience autonomy, competence, and connection. People want to feel in control of their actions, strive to become skilled in those actions, and need to experience a sense of belonging.

Other researchers have proposed a modern reformulation of Hull’s ideas that remedies some of the original theory’s failings.

Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Stults-Kolehmainen MA. Humans have a basic physical and psychological need to move the body: Physical activity as a primary drive. Front Psychol. 2023;14:1134049. doi:10.3389/fpsyg.2023.1134049

  2. Littman RA, Wade EA. A negative test of the drive-reduction hypothesis. Quarterly Journal of Experimental Psychology. 1955;7(2):56-66. doi:10.1080/17470215508416675

  3. Keramati M, Gutkin B. Homeostatic reinforcement learning for integrating reward collection and physiological stability. Elife. 2014;3:e04811. doi:10.7554/eLife.04811

  4. American Psychological Association. Arousal theory.

  5. Ryan RM, Deci EL. Intrinsic and extrinsic motivation from a self-determination theory perspective: Definitions, theory, practices, and future directions. Contemp Educ Psychol. 2020;61:101860. doi:10.1016/j.cedpsych.2020.101860

Additional Reading

Kendra Cherry

By Kendra Cherry, MSEd

Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the “Everything Psychology Book.”


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Benefits and Things to Consider


Key Takeaways

  • Horses help people practice staying present and focused during therapy.
  • Caring for horses can teach responsibility and empathy.
  • Equine therapy can help with PTSD, anxiety, and ADHD.

Animals can offer an extraordinary amount of emotional support. Beyond the pet-owner relationship that many of us have lovingly experienced, animals are sometimes used in therapeutic settings to help clients navigate challenging emotional experiences.

Verywell / JR Bee

What Is Equine Therapy?

Equine-assisted psychotherapy incorporates horses into the therapeutic process. People engage in activities such as grooming, feeding, and leading a horse while being supervised by a mental health professional.

Goals of this form of therapy including helping people develop skills such as emotional regulation, self-confidence, and responsibility. With mature horses weighing anywhere in the range of 900 to 2,000 pounds or more, it might feel a bit intimidating to have such a large, majestic creature participating in your therapy sessions.

However, equine-assisted therapy is growing in popularity due to its experiential approach and some burgeoning evidence of its effectiveness. There are a variety of terms used to describe or reference equine-assisted psychotherapy, including:

  • Equine-assisted mental health
  • Equine-assisted counseling
  • Equine-facilitated psychotherapy
  • Equine-assisted therapy

The last term, equine-assisted therapy, can also often refer to other forms of therapy where horses are used, such as with occupational therapy.

History of Equine Therapy

Horses have been used for therapeutic purposes since the time of the ancient Greeks. The Greek physician Hippocrates, known as the “Father of Medicine,” wrote about the therapeutic potential of horseback riding.

Riding became more popular as a therapy tool during the 1950s and 1960s. In 1969, the North American Riding for Handicapped Association was formed, which later became the Professional Association of Therapeutic Horsemanship (PATH) International.

Who It’s For

Equine-assisted psychotherapy (EAP) can be used with a variety of populations and in a variety of therapeutic settings. In fact, horses can be used in counseling with individuals of all ages, even with families and groups.

Equine-assisted psychotherapy is often not the sole form of treatment, but rather a complementary therapeutic service to be used in partnership with more traditional treatment.

Offering a much different experience than traditional talk therapy, EAP brings people outdoors and offers an opportunity to use all senses while learning and processing through emotional challenges.

Children and Teens

Equine facilitated psychotherapy may be just as effective with children and teens as it is with adult clients. As with adults, children can experience challenges such as trauma, anxiety, depression, PTSD, and more.

Equine therapy offers them a therapeutic environment that can feel less threatening and more inviting than a traditional talk therapy office. The majority of children participating in EAP are between the ages of 6 to 18 years old.

Children often find it difficult to open up and process painful emotions and experiences. Equine-assisted psychotherapy allows youth, and people of all ages, to work on issues such as:

  • Assertiveness
  • Confidence
  • Developing and maintaining relationships
  • Emotional awareness
  • Empathy
  • Impulse control
  • Problem-solving skills
  • Social skills
  • Trust in others
  • Trust in self

Benefits

Although a variety of animals can be used in the psychotherapeutic process, horses offer unique traits that have made them a top choice for animal-assisted therapies. According to anxiety expert Dr. Robin Zasio, horses bring the following unique elements to the therapy process.

Non-Judgmental and Unbiased

As much as humans, especially therapists, do our best to offer a safe space for clients to explore deep emotional hurts and painful experiences, it can be uncomfortable for clients to openly share their thoughts.

Building therapeutic rapport can take time as participants working toward building trust and practicing vulnerability in session.

Having the horse present may offer a sense of peace, as they only will react to the client’s behavior and emotions with no threat of bias or any judgment of their emotional experience.

Feedback and Mirroring

Horses are keen observers and are vigilant and sensitive to movement and emotion. They often mirror a client’s behavior or emotions, conveying understanding and connection that allows the client to feel safe.

This also allows for clients to maintain a sense of self-awareness, using the horse’s behavior and interactions for feedback and opportunities to check in and process what is happening in the moment.

Managing Vulnerability

As clients might find themselves vulnerable when trying to open up about emotional challenges, past experiences, or life transitions, the horse can offer a reference point to use for processing.

If something feels too painful to speak of, it can feel a bit easier for clients to process using the horse as an example, or to align their experience with the horse’s experiences in the moment. Externalizing the content in this way can make things easier to approach and process through.

Other Benefits

Some other potential benefits of equine therapy include increased:

  • Adaptability
  • Distress tolerance
  • Emotional awareness
  • Independence
  • Impulse control
  • Self-esteem
  • Social awareness
  • Social relationships

Horses also require work. They must be fed, watered, exercised, and groomed. Providing this type of care can often be therapeutic. It helps establish routines and structure, and the act of caring and nurturing something else can help build empathy.

Conditions

Equine therapy has some evidence supporting its effectiveness in helping to manage several conditions.

Anxiety

Anxiety disorders affect more than 17 million Americans. Although most people experience some level of anxiety at points in their lives, especially around experiences involving change and uncertainty, there are times when people experience anxiety that meets clinical diagnostic criteria. Anxiety-related conditions include, but aren’t limited to:

Many people who struggle with anxiety find themselves stuck in worry about their past and fear about their future. As Dr. Zasio points out, working with a horse during the therapeutic process can create an opportunity for clients to “stay present and focused on the task at hand.”

Since horses are vigilant and sensitive to behavior and emotions, they can sense danger and respond with a heightened awareness, which typically leads to a change in their behavior and possible attempts to get away. Clients who struggle with anxiety can relate to this ability to sense danger cues and respond in a heightened way.

Processing challenges through a horse’s behavior can be easier for certain clients than speaking directly about their own personal experiences with anxiety.

Another benefit of using equine-assisted psychotherapy in the treatment of anxiety is helping clients practice vulnerability in a safe environment. As clients learn to interact with the horse and try new things, they are being asked to step out of their comfort zone with the help and support of the therapist and the horse.

Clients can then process their experience, such as the fears and challenges, as well as any insights, discoveries, or victories in those moments during therapy.

PTSD

Post-traumatic stress disorder (PTSD), a disordered marked by increased arousal and reactivity, intrusive memories and nightmares, and avoidance symptoms after a traumatic event, can feel debilitating. According to the Anxiety and Depression Association of America (AADA), it is estimated that 7.7 million people aged 18 or older struggle with PTSD.

Children, teens, and adults can struggle with PTSD. Although people can experience a variety of traumatic events that could influence the development of PTSD, those who have experienced sexual assault, as well as veterans who have experienced combat, are populations who tend to have higher rates of the development of PTSD.

The use of equine-assisted psychotherapy in the treatment of PTSD for veterans is growing.

Tess Hassett, a riding instructor at the Northern Virginia Therapeutic Riding Program, has a background in clinical psychology and is working with veterans using EAP.

Describing her work with veterans, Hassett noted, “A lot of them have said that after what they’ve been through with their PTSD and depression, they never thought they’d be able to bond with someone again and feel that personal connection. But with their horse, they’re feeling that connection. They’re able to take that into the rest of their lives and into their relationships.”

Addiction Treatment

It is known that drug and alcohol addiction continues to rise and be problematic in the United States. The Center for Disease Control and Prevention (CDC) estimates that over 70,000 people died from a drug overdose in 2017.

Many of those were a result of the opioid epidemic, with almost 50,000 deaths occurring as a result of opioid use. The need for effective therapies to help treat addiction is at an all-time high.

Equine-assisted psychotherapy offers a unique approach to treating addiction and co-occurring conditions. A co-occurring condition, which used to be referred to as a dual diagnosis, describes someone who struggles with addiction in addition to having another mental health condition—a common occurrence.

The ultimate goal of addiction treatment is to help clients live sober, healthy, and productive lives. Many times in addiction treatment, clients are also working hard to heal hurts within relationship dynamics, such as within a family or with their partner. Learning to trust, practice vulnerability, and communicate effectively can be a challenge during this treatment process.

EAP can help clients learn how to develop a sense of trust through their interactions with the horse as they gain a sense of safety and build a relationship. The experience can encourage clients to be vulnerable as they learn new things and interact with the horse.

ADHD

Attention-deficit/hyperactivity disorder (ADHD), is an additional area where equine-assisted psychotherapy can be helpful. Some report EAP is appealing to adults and youth with ADHD because it offers them an active, fun, and hands-on experience.

During equine-assisted therapy, the client is typically with a trained therapist, an equine specialist, and the horse. Riding isn’t necessarily involved with equine-assisted psychotherapy. Rather, the focus is on presence, attention, mindfulness, boundaries, social cues, and more.

Kay Trotter, PhD, a licensed professional counselor, author, and founder of Equine Partners in Counseling (EPIC) Enterprises, was one of the first to dedicate research to the effectiveness of equine-assisted psychotherapy.

Trotter found that introducing horses to the therapeutic process showed significantly increased positive behaviors while reducing negative behaviors.

Her study was one of the first published on the effectiveness of EAP, published in the Journal for Creativity in Mental Health. It has been shown that clients can experience a variety of benefit from equine-assisted psychotherapy, such as:

  • Increased in self-esteem
  • Increased in self-respect
  • Improved adjustment to routines and guidelines
  • Improved focus
  • Less stressful friendships
  • Reduced aggression

For clients struggling with ADHD, the sense of accomplishment in an equine-assisted psychotherapy session can be of great benefit. As a licensed clinical social worker, Kit Muellner says that “clients feel that they’ve achieved something on their own, rather than being told to do something by a parent or teacher.

A 1,500-pound animal responds the way you want him to because you were able to focus. So you’ve accomplished something you wanted to do, versus something that somebody else wanted you to do.”

This sense of accomplishment can feel significant for anyone, especially someone who struggles with ADHD. In those moments, they are getting instant feedback from their horse and learning how to develop trust, communicate effectively, and how to work toward meeting a personal goal or milestone.

Equine Assisted Therapists

The Equine Assisted Growth and Learning Association (EAGALA) is a non-profit organization dedicated to setting the standard for professionals working with horses in a therapeutic setting. They offer training and have established a specialized certification process for those wishing to become a recognized, trained equine-assisted therapy professional.

In addition to EAGALA, there are other programs dedicated to proper training and maintenance of standards for those working with clients in the field of EAP.

To conduct therapy, regardless of whether you are providing equine-assisted therapy or not, you will need to contact your state regulatory board to learn about the educational and clinical requirements needed to become a licensed professional counselor or therapist in your state.

Equine-assisted therapy is a particular style and specialization within the field of psychotherapy, with clinicians seeking and earning special training and certification related to the practice of EAP.

Things to Consider

There are some factors to consider when deciding to explore equine-assisted therapy for yourself or a loved one. Always take physical ability and overall health into consideration. If you have scoliosis, spina bifida, or another back-related health issue, talk to your doctor before trying equine therapy. 

Timing

Depending on the challenges the client is facing, the timing may or may not be appropriate for EAP. For example, when someone is faced with addiction, they will need proper time to detox and establish compliance with an appropriate treatment program before possibly incorporating equine-assisted therapy services.

Fear

Although equine-assisted therapy has been shown to be helpful in the treatment of anxiety, a client may fear being around a large horse and not feel motivated to attend this type of treatment. There may also be a traumatic memory involving animals that would prevent someone from being willing to participate.

It is important to speak with a trained mental health provider to determine if you or your loved one are a good fit for equine-assisted therapy. Most programs will have an assessment process to determine if EAP is right for you before beginning any treatment.

Cost

Because equine-assisted psychotherapy is only more recently growing in popularity and gaining traction as an effective treatment for mental health and substance abuse, keep in mind that this service may not be covered by insurance benefits.

The fees for EAP services will vary by location and can range in price. It is recommended that you contact your insurance company and your local equine therapy facility to discuss those details in advance.


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