Critics argue that the basic theoretical assumptions of NLP and strong claims of efficacy are not warranted without empirical validation. Exaggerated claims made by some proponents in advertising and marketing, especially in the personal development and self-help applications, have also drawn criticism. Proponents often emphasize its pragmatic approach and aim at creating models of "what works" rather than "truth". However, some critics regard NLP as pseudoscience or as a New Age form of psychotherapy for what they see as unsubstantiated and often exaggerated claims. NLP has enjoyed little support within the psychological profession following research reviewed in the Journal of Counseling Psychology in the early 1980s which focused on preferred representational systems and matching sensory modalities to enhance client-therapist rapport in counseling. A recent survey of mental health professionals about the future of psychotherapy excluded NLP because the researchers believed it has been outdated. While there have been some efforts within NLP to improve its practice, recent research is spread thinly across various disciplines and the field remains splintered.
In 2001, an off-shoot application of NLP, Neuro-linguistic psychotherapy, was recognized by United Kingdom Council for Psychotherapy (UKCP) as an experimental constructivist form of psychotherapy. The first, vendor neutral, NLP Research Conference was held in 2008 sponsored by University of Surrey with the aim of encouraging improved research collaboration.
NLP originated when Richard Bandler, a student at University of California, Santa Cruz, was transcribing taped therapy sessions of the Gestalt therapist Fritz Perls as a project for the psychiatrist Robert Spitzer, who had originally commissioned Bandler to teach his son drums. Bandler believed he recognized particular word and sentence structures which facilitated the acceptance of Perls’ positive suggestions. Bandler took this idea to one of his university teachers, John Grinder, a linguist, and together they produced what they termed the Meta Model, a model of what they believed to be influential word structures and how they work. They also 'modelled' the therapeutic sessions of the family therapist Virginia Satir.
They published an account of their work in The Structure of Magic in 1975, when Bandler was 25. The main theme of the book was that it was possible to analyse and codify the therapeutic methods of Satir and Perl. Exceptional therapy, even when it appears 'magical', has a discernible structure, which anyone could learn. Some of the book was based on previous work by Grinder on transformational grammar, the Chomskyan generative syntax that was current at the time. Some considered the importation of transformational grammar to psychotherapy to be Bandler and Grinder's main contribution to the field of psychotherapy. Bandler and Grinder also made use of ideas of Gregory Bateson, who was influenced by Alfred Korzybski, particularly his ideas about human modeling and that 'the map is not the territory'.
Impressed by the work with Fritz Perls and Virgina Satir, the British anthropologist Gregory Bateson agreed to write the preface and also introduced Bandler and Grinder to Milton Erickson who would become the third model for NLP. Erickson, an American psychiatrist and founding member of the American Society for Clinical Hypnosis, was well known for his unconventional approach to therapy, for his ability to "utilize" anything about a patient to help them change, including their beliefs, favorite words, cultural background, personal history, or even their neurotic habits, and for treating the unconscious mind as creative, solution-generating, and often positive.
At that time the Californian human potential seminars were developing into an industry. As well as a therapeutic method, its founders claimed that it was a study of communication and by the 1970s Grinder and Bandler were marketing it as a business tool, claiming that 'if any human being can do anything, so can you'. After 150 students paid $1,000 each for a ten-day workshop in Santa Cruz, Bandler and Grindler gave up academic writing to produce popular books from seminar transcripts, such as Frogs into Princes, which sold more than 270,000 copies. According to court documents, Bandler's NLP business made more than $800,000 in 1980.
In the 1980s, shortly after publishing Neuro-Linguistic Programming: Volume I with Robert Dilts and Judith Delozier, Grinder and Bandler fell out. Amidst acrimony and intellectual property lawsuits, the NLP brand was adopted by other training businesses. Some time afterwards, John Grinder collaborated with various people to develop a form of NLP called the New Code of NLP which attempted to restore a whole mind-body systemic approach to NLP Richard Bandler also published new processes based on submodalities and Ericksonian hypnosis.
Despite the NLP community being splintered, most NLP material acknowledges the early work of the co-founders, Bandler and Grinder, and the development group that surrounded them in the 1970s.
Today, NLP is a lucrative industry, and many variants of the practice are found in seminars, workshops, books and audio programs in the form of exercises and principles intended to influence behavioral and emotional change in self and others. There is great variation in the depth and breadth of training and standards of practitioners, and some disagreement between those in the field about which patterns are, or are not, "NLP".
NLP began with the studies of three "master psychotherapists", Fritz Perls, Virginia Satir, and Milton Erickson. Grinder and Bandler reviewed many hours of audio and video of the three therapists and spent months imitating how they worked with clients, in order to replicate or 'model' the communication patterns which supposedly made these individuals more successful than their peers. The studies were an attempt to identify why particular psychotherapists were so effective with their patients. Rather than take a purely theoretical approach, Bandler and Grinder sought to observe what the therapists were doing, categorize it, and 'model' it.
Bandler and Grinder aimed to learn and codify the "know-how" (as opposed to "know-what" [facts] or "know-why" [science]) that set these experts apart from their peers. The expert therapists knew what they were doing but there were tacit aspects of this knowledge (i.e., subtleties which cannot be explained or codified and can only be transmitted via training or gained through personal experience). In the initial phase of the modeling process, Bandler and Grinder spent months observing, in person and via recordings, and imitating how their models worked with clients. The initial part ("unconscious uptake") of the modeling process involved putting aside prior knowledge or expectations:
While the style and approach of these psychotherapists were apparently different, Bandler and Grinder believed that all experts in human communication (including Perls, Satir and Erickson) have patterns in common that could be learnt by others:
They claimed that there were a few common traits expert communicators – whether top therapists, top executives or top salespeople – all seemed to share:
As a result, they claimed that there were only three behaviour patterns underlying successful communication in therapy, business and sales: to know what outcome you want, to be flexible in your behaviour, and to generate different kinds of behaviour to find out what response you get, and to have enough sensory experience to notice when you get the responses that you want.
The methods of observation and imitation Bandler and Grinder used to learn and codify the initial models of NLP came to be known as Modeling. Proponents maintain that NLP Modeling is not confined to therapy but can be applied to all human learning. Another aspect of NLP modeling is understanding the patterns of one's own behaviors in order to 'model' the more successful parts of oneself.
The meta model can be seen as a heuristic that responds to the words and phrases that reveal unconscious limitations and faulty thinking — the distortions, generalizations and deletions in language. Bandler and Grinder observed similar patterns in the communication of Fritz Perls and Virginia Satir (and gleaned from a set of transformational grammar language categories). The meta model seeks to recover unspoken information, and to challenge generalization the other distorted messages that involve restrictive thinking and beliefs. The intent is to help someone develop new choice in thinking and behavior. By listening to and carefully responding to the distortions (generalizations and deletions) in a client's sentences, the practitioner seeks to respond to the syntactic form of the sentence rather than the content itself.
For example, if someone said, "everyone must love me," the message is overly general as it does not specify any particular person or group of people. Examples of meta model responses include "which people, specifically?" or "all people?" and questions to define the criteria that would be acceptable for this person to know when he or she is experiencing the state of "love". The practitioner also understands that words such as "must" also indicates necessity or lack of choice on the part of the speaker. A meta-model response might be, "what would happen if they did/didn't?" Practitioners choose when to respond and when not to, using softeners and linkage phrases from the Milton model to maintain rapport.
In contrast to the Meta Model of NLP which seeks to specify information, is the Milton Erickson-inspired Milton model described by Bandler and Grinder as "artfully vague". In it the communicator makes statements that seem specific but allow the listener to fill in their own meaning for what is being said. It makes use of pacing and leading, ambiguity, metaphor, embedded suggestion, and multiple-meaning sentence structures. It has been described as "a way of using language to induce and maintain trance in order to contact the hidden resources of our personality". The Milton model has three primary aspects: First, to assist in building and maintaining rapport with the client. Second, to overload and distract the conscious mind so that unconscious communication can be cultivated. Third, to allow for interpretation in the words offered to the client.
After spending months closely studying Erickson's language (verbal and non-verbal) and imitating the way that Erickson worked with clients, Bandler and Grinder published the Milton model in 1976/1977 under the title The Patterns of Milton H. Erickson Volumes I & II. In the preface, Erickson said, "Although this book [...] is far from being a complete description of my methodologies, as they so clearly state it is a much better explanation of how I work than I, myself, can give. I know what I do, but to explain how I do it is much too difficult for me." Erickson was known for his use of unconventional approaches, including the use of stories, and for deeply entering the world of his clients. The Milton model is a way of communicating based on the hypnotic language patterns of Milton Erickson.
The basic assumption of NLP is that internal mental processes such as problem solving, memory, and language consist of visual, auditory, kinesthetic (and possibly olfactory and gustatory) representations (often shortened to VAK or VAKOG) that are engaged when people think about problems, tasks or activities, or engage in them. Internal sensory representations are constantly being formed and activated. Whether making conversation, talking about a problem, reading a book, kicking a ball or riding a horse, internal representations have an impact on performance. NLP techniques generally aim to change behavior through modifying the internal representations, examining the way a person represents a problem and by building desirable representations of alternative outcomes or goals. In addition, Bandler and Grinder claimed that the representational system use could be tracked using eye movements, gestures, breathing, sensory predicates and other cues in order to improve rapport and social influence.
Some of these ideas of sensory representations and associated therapeutic ideas appear to have been imported from gestalt therapy shortly after its creation in the 1970s.Accessing cues
Bandler and Grinder claimed that matching and responding to the representational systems people use to think is generally beneficial for enhancing rapport and influence in communication. They proposed several models for this purpose including eye accessing cues and sensory predicates. The direction of eye accesses was considered an indicator of the type of internal mental process (see the chart):
The sensory predicates, breathing posture and gestures were also considered important. In the sensory predicate model, if someone said:
These verbal cues are often coupled with posture changes, eye movements, skin color or breathing shifts. Essentially, it was claimed that the practitioner could ascertain the current sensory mode of thinking from external cues such as the direction of eye movements, posture, breathing, tone of voice and the use of sensory-based predicates.Preferred representational systems
The majority of research (as published in the Journal of Counseling Psychology in the early 1980s) focused on Bandler and Grinder's claim that a preferred representational system (PRS) exists and is effective in counseling-client influence. Put simply, they claimed that some people prefer visual, auditory, or kinesthetic processing. Further, a therapist (or communicator) could be more influential by matching the other's preferred system. Christopher Sharpley's review of counselling psychology literature on PRS found that it could not be reliably assessed, it was not certain that it even existed and it could not be demonstrated to reliably assist counselors. Buckner (published after Sharpley) found some support for the notion that eye movements can indicate visual and auditory components of thought in that moment.
While some NLP training programs and books still feature PRS, many have modified or dropped it. Richard Bandler, for example, de-emphasized its importance in an interview with the Enhancing Human Performance subcommittee. John Grinder, in the New Code of NLP, emphasizes individual calibration and sensory acuity, precluding such a rigidly specified model as the one described above. Responding directly to sensory experience requires an immediacy which respects the importance of context. Grinder also stated in an interview that a representational system diagnosis lasts about 30 seconds.
Submodalities are the fine details of sensory representational systems or modalities. In the late 1970s, the use of visual imagery was common in goal setting, sports psychology and meditation. Not only did Bandler and Grinder begin to explore imagery in all sensory modalities (Visual, Auditory, Kinesthetic, Gustatory and Olfactory), they also were interested in the qualities/properties of internal representations, the "submodalities".
Bandler and Grinder observed that for some people increasing the brightness, color or location of an internal imagery, intensity of their state also increased. They observed similar patterns different sensory modalities (e.g. Auditorial and Kinesthetic systems) in other people and changes depending on context.
This work with submodalities inspired a number of novel interventions within NLP, therapeutic and personal development settings. For example, the swish pattern is proposed to reduce unwanted habits. It involves first deciding on a positive alternative. The desired alternative may be in the form of a representation of the self, resourceful and happy. The internal representations that previously triggered unwanted behavior are identified and recoded in the form of something that is uninteresting to the participant, typically small and dark. The desirable outcome recoded in a form of something that is highly motivating, typically bright, colourful and large. After the initial preparation, the participant is asked to bring to mind the representation of the unwanted behavior. As this is brought to mind the participant immediately makes it small and dark and bring forth an image of the desired alternative. The process is repeated and revised as required. To test it, the participant then put himself into the context where the old behavior used to be triggered. The process is considered successful if the participant remain resourceful when recalling the context where the unwanted behavior used to occur and automatically thinks of the desired alternative.
NLP proposed a number of simple techniques involving matching, pacing and leading for establishing rapport with people. There are a number of techniques explored in NLP that are supposed to be beneficial in building and maintaining rapport such as: matching and pacing non-verbal behavior (body posture, head position, gestures, voice tone, and so forth) and matching speech and body rhythms of others (breathing, pulse, and so forth).
Anchoring appears to have been imported into NLP from family systems therapy as part of the 'model' of Virginia Satir.
In 1984, Christopher F. Sharpley (publishing in the Journal of Counseling Psychology) undertook a literature review of 15 studies on the existence and effectiveness of preferred representational systems (PRS), an underlying principle of NLP. He found "little research evidence supporting its usefulness as an effective counseling tool" and that there was no reproducible support for PRS and predicate matching. Eric Einspruch and Bruce Forman (1985) broadly agreed with Sharpley, but they disputed the conclusions, identifying a failure to address methodological errors in the research reviewed. They stated that "NLP is far more complex than presumed by researchers, and thus, the data are not true evaluations of NLP" adding that NLP is difficult to test under the traditional counseling psychology framework. Moreover, they argued the research lacked a necessary understanding of pattern recognition as part of advanced NLP training. There was also inadequate control of context, an unfamiliarity with NLP as an approach to therapy, inadequate definitions of rapport, and numerous logical mistakes in the research methodology. In 1987, Sharpley published a response to Einspruch and Forman with a review of a further 7 studies on the same basic tenets (totalling 44 including those cited by Einspruch and Forman). This second article included a review of Elich et al (1985), a study that found no support for the proposed relationship between eye movements, spoken predicates, and internal imagery. Elich et al stated that "NLP has achieved something akin to cult status when it may be nothing more than a psychological fad".
In response to the experimental literature reviews Watkins said that "Neurolinguistic Programming studies attempted to match eye movements and representational patterns. These are appropriate tests of the validity of the proponents' claims. However, one can only speculate what might have been learned with a wider range of outcome variables. Since this is a review of empirical research it may seem unfair to focus on limitations of the studies reported, but at a minimum the authors could have critiqued the methodological rigor and conceptual soundness of the variables tested."
As part of a study that investigated various psychological techniques for learning, improving motor skills, altering mental states, stress management and social influence at the request of the US Army Research Institute, the Committee on Techniques for the Enhancement of Human Performance (United States National Research Council) selected several heavily marketed human performance enhancement techniques that made strong claims for their efficacy. Many of the techniques evaluated happened to have origins in the human potential movement. NLP was selected as a strategy for social influence and was evaluated by the psychological techniques committee directed by social psychologist Daniel Druckman. The committee was already aware of the weak support for preferred representation systems (PRS) in the literature and noted that the body of research had largely not tested NLP beyond the assumptions related to PRS (consistent with the Sharpley's literature review in Journal of Counseling Psychology). However, the effect of matching predicates on all representations showed strong effect on perceptions.
The psychological techniques study committee directed by Druckman "found little if any evidence to support NLP’s assumptions or that it is effective as a strategy for social influence." But the committee "were impressed with the modeling approach used to develop the [NLP] technique. The technique was developed from careful observations of the way three master psychotherapists conducted their sessions, emphasizing imitation of verbal and nonverbal behaviors (Druckman & Swets, 1988, Chapter 8). This then led the committee to take up the topic of expert modeling in the second phase of its work." While the committee recommended further investigation into the NLP as a "model of expert performance, NLP was not mentioned in "Enhancing Human Performance" publications that followed, except by way of acknowledgment for the observation and imitation methods used by Bandler and Grinder to model the verbal and non-verbal patterns of "master psychotherapists" Fritz Perls, Virginia Satir and Milton Erickson in the early development of NLP.
Similarly in the field of psychotherapy it is stated that the "original interest in NLP turned to disillusionment after the research and now it is rarely even mentioned in psychotherapy".
There has been some ongoing research by both NLP practitioners and psychologists, including outcome-based research and research of therapies which share NLP processes, but there are no thorough reviews or meta-analyses of NLP's effectiveness.
Grant Devilly (2005) researching the experimental evidence underlying several "power therapies" including EMDR and VK/D (a technique spawned from NLP) stated that there had not been any peer-reviewed experimental research published yet concerning VK/D. He comments that:
Proponents of NLP often claim it is predicated on a scientific understanding and the name of neuro-linguistic programming implies a basis in science. Cognitive neuroscience researcher Michael C Corballis (1999) said that "NLP is a thoroughly fake title, designed to give the impression of scientific respectability."
Researcher and clinician Scott Lilienfeld said that "largely untested treatments comprise a major proportion—in some cases a majority—of the interventions delivered by mental health professionals." Lilienfeld argues that NLP, as a New Age psychotherapy, is one of many hundreds of variations of psychotherapy that have not been subject to rigorous empirical validation. Lilienfeld and colleagues believe that randomized controlled studies are the only way to verify whether or not psychotherapeutic treatments are effective. It is argued that the proof of the validity of new therapeutic practices in clinical psychology fall on the proponents of these practices. There has been no peer-reviewed empirical research on VK/D (Visual/Kinesthetic dissociation), an intervention derived from NLP which has been been taught alongside other Power therapies (eg. EMDR, TFT).
Psycholinguist Willem Levelt (in the Dutch skeptical magazine Skepter) acknowledges that the main point of NLP was pragmatic, but doubts the basis in neurology, linguistics and computer programming implied. He argues that most modern neurologists are informed about the brain based on neuro-imaging and clinical data but in NLP there has been little interest in neuroscience or clinical research. He asserts that the experimental evidence does not exist to support the hypothesis that eye movements can reveal preferred representational system. He also claims there are philosophical conflicts between the NLP meta model, the philosophy of David Hume (sensory experience is combined to form representations) and William Wundt (which Levelt considers close to "the study of subjective experience", a main idea in NLP).
In contrast to mainstream psychotherapy, NLP does not concentrate on diagnosis, treatment and assessment of mental and behavioral disorders. Instead, it focuses on helping clients to overcome their own self-perceived, or subjective, problems. It seeks to do this while respecting their own capabilities and wisdom to choose additional goals for the intervention as they learn more about their problems, and to modify and specify those goals further as a result of extended interaction with a therapist. The two main therapeutic uses of NLP are use as an adjunct by therapists practicing in other therapeutic disciplines, or as a specific therapy called Neurolinguistic Psychotherapy (NLPt).
While the main goals of Neuro-linguistic programming are therapeutic, the patterns have also been adapted for use outside of psychotherapy including business communication, management training, sales, sports, and interpersonal influence.
For some, the techniques, such as anchoring, reframing, therapeutic metaphor and hypnotic suggestion, were intended to be used in the therapeutic setting. Research in counseling psychology found rapport to be no more effective than existing listening skills taught to counselors. Furthermore, Druckman found weak empirical support for PRS and little theoretical support in counseling psychology and the experimental literature for NLP as a technique for social influence. Sharpley concluded that most of the other techniques available in NLP were already available in counseling.
Outside of psychotherapy, the meta model, for example, is seen by some as a promising business management communication technique.
NLP also teaches that people are unconsciously influenced when making decisions, and that they can give indications in their muscle and facial movements of their thought processes. The public perception of NLP, like hypnosis, is often mixed (sometimes deliberately) with public preconceptions and interest in the unknown.
In the introduction to The Structure of Magic Series, Gregory Bateson stated that "[Bandler and Grinder] create the beginnings of an appropriate theoretical base for the describing of human interaction. [They] have succeeded in making linguistics into a base for theory and simultaneously into a tool for therapy."
One of the techniques utilized by NLP Marin is similar to the pseudoscience of Vegetotherapy, which was originally proposed by Wilhelm Reich.
Peter Labouchere states that "NLP has a very pragmatic, applied focus on what is helpful, what works and how to replicate it (Bandler & Grinder, 1990). While NLP draws on and shares common ground with ‘mainstream’ cognitive psychology, it has, from its inception, continued to develop, refine, and apply its own unique range of concepts, models and techniques."
Christoper Partridge states that "NLP may be best thought of as a system of psychology concerned with the self development of the human being" and "It is concerned with the function of belief rather than its nature. It is not concerned whether a belief is true or not, but whether it is empowering or disempowering. NLP's focus on subjective experience and its view that we cannot comprehend objective reality means that it fits well as an example of postmodern thought." Similarly, Stephen J. Hunt states that NLP "is a technique rather than an organized religion and is used by several different human potential movements". David V. Barrett (2001) also describes NLP as a technique or series of techniques, or a process. He states that that "the balance comes down against it being labeled as a religion".