Priming (psychology)
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Priming is the idea that exposure to one
Priming works most effectively when the two stimuli are in the same modality. For example, visual priming works best with visual cues and verbal priming works best with verbal cues. But priming also occurs between modalities,[5] or between semantically related words such as "doctor" and "nurse".[6][7]
Priming research in terms of behavioral priming is in doubt due to the
Types
Positive and negative priming
The terms positive and negative priming refer to when priming affects the speed of processing. A positive prime speeds up processing, while a negative prime lowers the speed to slower than un-primed levels.[11] Positive priming is caused by simply experiencing the stimulus,[12] while negative priming is caused by experiencing the stimulus, and then ignoring it.[11][13] Positive priming effects happen even if the prime is not consciously perceived.[12] The effects of positive and negative priming are visible in event-related potential (ERP) readings.[14]
Positive priming is thought to be caused by spreading activation.[12] This means that the first stimulus activates parts of a particular representation or association in memory just before carrying out an action or task. The representation is already partially activated when the second stimulus is encountered, so less additional activation is needed for one to become consciously aware of it.
Negative priming is more difficult to explain. Many models have been hypothesized, but currently the most widely accepted are the distractor inhibition and episodic retrieval models.[11] In the distractor inhibition model, the activation of ignored stimuli is inhibited by the brain.[11] The episodic retrieval model hypothesizes that ignored items are flagged 'do-not-respond' by the brain. Later, when the brain acts to retrieve this information, the tag causes a conflict. The time taken to resolve this conflict causes negative priming.[11] Although both models are still valid, recent scientific research has led scientists to lean away from the distractor inhibitor model.[11]
Perceptual and conceptual priming
The difference between perceptual and conceptual types of priming is whether items with a similar form or items with a similar meaning are primed, respectively.
Perceptual priming is based on the form of the stimulus and is enhanced by the match between the early and later stimuli. Perceptual priming is sensitive to the modality and exact format of the stimulus. An example of perceptual priming is the identification of an incomplete word in a word-stem completion test. The presentation of the visual prime does not have to be perfectly consistent with later testing presentations in order to work. Studies have shown that, for example, the absolute size of the stimuli can vary and still provide significant evidence of priming.[15]
Conceptual priming is based on the meaning of a stimulus and is enhanced by semantic tasks. For example, the word table will show conceptual priming effects on the word chair, because the words belong to the same category.[16]
Repetition priming
Repetition priming, also called direct priming, is a form of positive priming. When a stimulus is experienced, it is also primed. This means that later experiences of the stimulus will be processed more quickly by the brain.[17] This effect has been found on words in the lexical decision task.
Semantic priming
In semantic priming, the prime and the target are from the same semantic category and share features.
In support with further detail, when an individual processes a word sometimes that word can be affected when the prior word is linked semantically. Previous studies have been conducted, focusing on priming effects having a rapid rise time and a hasty decay time. For example, an experiment by Donald Foss researched the decay time of semantic facilitation in lists and sentences. Three experiments were conducted and it was found that semantic relationships within words differs when words occur in sentences rather than lists. Thus, supporting the ongoing discourse model.[20]
Associative priming
In associative priming, the target is a word that has a high probability of appearing with the prime, and is "associated" with it but not necessarily related in semantic features. The word dog is an associative prime for cat, since the words are closely associated and frequently appear together (in phrases like "raining cats and dogs").[21] A similar effect is known as context priming. Context priming works by using a context to speed up processing for stimuli that are likely to occur in that context. A useful application of this effect is reading written text.[22] The grammar and vocabulary of the sentence provide contextual clues for words that will occur later in the sentence. These later words are processed more quickly than if they had been read alone, and the effect is greater for more difficult or uncommon words.[22]
Response priming
In the psychology of visual perception and motor control, the term response priming denotes a special form of visuomotor priming effect. The distinctive feature of response priming is that prime and target are presented in quick succession (typically, less than 100 milliseconds apart) and are coupled to identical or alternative motor responses.[23][24] When a speeded motor response is performed to classify the target stimulus, a prime immediately preceding the target can thus induce response conflicts when assigned to a different response as the target. These response conflicts have observable effects on motor behavior, leading to priming effects, e.g., in response times and error rates. A special property of response priming is its independence from visual awareness of the prime: For example, response priming effects can increase under conditions where visual awareness of the prime is decreasing.[25][26]
Masked priming
The masked priming paradigm has been widely used in the last two decades in order to investigate both
Kindness priming
Kindness priming is a specific form of priming that occurs when a subject experiences an act of kindness and subsequently experiences a lower threshold of activation when subsequently encountering positive stimuli. A unique feature of kindness priming is that it causes a temporarily increased resistance to negative stimuli in addition to the increased activation of positive associative networks.[38] This form of priming is closely related to affect priming.
Affective priming
Affective or affect priming entails the evaluation of people, ideas, objects, goods, etc., not only based on the physical features of those things, but also on affective context. Most research and concepts about affective priming derive from the affective priming paradigm where people are asked to evaluate or respond to a stimuli following positive, neutral, or negative primes. Some research suggests that valence (positive vs. negative) has a stronger effect than arousal (low vs. high) on lexical-decision tasks.[39] Affective priming might also be more diffuse and stronger when the prime barely enters conscious awareness.[40] Evaluation of emotions can be primed by other emotions as well. Thus, neutral pictures, when presented after unpleasant pictures, are perceived as more pleasant than when presented after pleasant pictures.[41]
Cultural priming
Cultural priming is a technique employed in the field of
Anti-priming
Anti-priming is a measurable impairment in processing information owing to recent processing of other information when the representations of information overlap and compete. Strengthening one representation after its usage causes priming for that item but also anti-priming for some other, non-repeated items.[50] For example, in one study, identification accuracy of old Chinese characters was significantly higher than baseline measurements (i.e., the priming effect), while identification accuracy of novel characters was significantly lower than baseline measurements (i.e., the anti-priming effect).[51] Anti-priming is said to be the natural antithesis of repetition priming, and it manifests when two objects share component features, thereby having overlapping representations.[52] However, one study failed to find anti-priming effects in a picture-naming task even though repetition priming effects were observed. Researchers argue that anti-priming effects may not be observed in a small time-frame.[52]
Replicability controversy
The replicability and interpretation of behavioral priming findings has become controversial.[8] Studies in 2012 failed to replicate findings, including age priming,[10] with additional reports of failure to replicate this and other findings such as social-distance also reported.[53][54]
Priming is often considered to play a part in the success of sensory branding of products and connected to ideas like crossmodal correspondencies and sensation transference. Known effects are e.g. consumers perceiving lemonade suddenly as sweeter when the logo of the drink is more saturated towards yellow,[55] although this result has not yet been replicated by an independent study.
Although semantic, associative, and form priming are well established,
Measuring the effects of priming
Priming effects can be found with many of the tests of implicit memory. Tests such as the word-stem completion task, and the word fragment completion task measure perceptual priming. In the word-stem completion task, participants are given a list of study words, and then asked to complete word "stems" consisting of 3 letters with the first word that comes to mind. A priming effect is observed when participants complete stems with words on the study list more often than with novel words. The word fragment completion task is similar, but instead of being given the stem of a word, participants are given a word with some letters missing. The lexical decision task can be used to demonstrate conceptual priming.[6][61] In this task, participants are asked to determine if a given string is a word or a nonword. Priming is demonstrated when participants are quicker to respond to words that have been primed with semantically-related words, e.g., faster to confirm "nurse" as a word when it is preceded by "doctor" than when it is preceded by "butter". Other evidence has been found through brain imaging and studies from brain injured patients. Another example of priming in healthcare research was studying if safety behaviors of nurses could be primed by structuring change of shift report.[62] A pilot simulation study found that there is early evidence to show that safety behaviors can be primed by including safety language into report.[62]
Effects of brain injuries
Amnesia
Patients with amnesia are described as those who have suffered damage to their medial temporal lobe, resulting in the impairment of explicit recollection of everyday facts and events. Priming studies on amnesic patients have varying results, depending on both the type of priming test done, as well as the phrasing of the instructions.
Amnesic patients do as well on perceptual priming tasks as healthy patients,[63] however they show some difficulties completing conceptual priming tasks, depending on the specific test. For example, they perform normally on category instance production tasks, but show impaired priming on any task that involves answering general knowledge questions.[64][65]
Phrasing of the instructions associated with the test has had a dramatic impact on an amnesic's ability to complete the task successfully. When performing a word-stem completion test, patients were able to successfully complete the task when asked to complete the stem using the first word that came to mind, but when explicitly asked to recall a word to complete the stem that was on the study list, patients performed at below-average levels.[66]
Overall, studies from amnesic patients indicate that priming is controlled by a brain system separate from the medial temporal system that supports explicit memory.
Aphasia
Perhaps the first use of semantic priming in neurological patients was with stroke patients with
Dementia
Patients with
Focal cortical lesions
Patient J.P., who suffered a stroke in the left medial/temporal gyrus, resulting in auditory verbal agnosia - the inability to comprehend spoken words, but maintaining the ability to read and write, and with no effects to hearing ability. J.P. showed normal perceptual priming, but his conceptual priming ability for spoken words was, expectedly, impaired.[69] Another patient, N.G., who suffered from prosopanomia (the inability to retrieve proper names) following damage to his left temporal lobe, was unable to spontaneously provide names of persons or cities, but was able to successfully complete a word-fragment completion exercise following priming with these names. This demonstrated intact perceptual priming abilities.[70]
Cognitive neuroscience
Perceptual priming
Priming while improving performance decreases neural processing in the
Conceptual priming
Conceptual priming has been linked to reduced blood flow in the left prefrontal cortex.[76] The left prefrontal cortex is believed to be involved in the semantic processing of words, among other tasks.[77]
The view that perceptual priming is controlled by the extrastriate cortex while conceptual priming is controlled by the left prefrontal cortex is undoubtedly an oversimplified view of the process, and current work is focused on elucidating the brain regions involved in priming in more detail.[78]
In daily life
Priming is thought to play a large part in the systems of stereotyping.[79] This is because attention to a response increases the frequency of that response, even if the attended response is undesired. [79][80] The attention given to these response or behaviors primes them for later activation.[79] Another way to explain this process is automaticity. If trait descriptions, for instance "stupid" or "friendly", have been frequently or recently used, these descriptions can be automatically used to interpret someone's behavior. An individual is unaware of this, and this may lead to behavior that may not agree with their personal beliefs.[81]
This can occur even if the subject is not conscious of the priming stimulus.[79] An example of this was done by John Bargh et al. in 1996. Subjects were implicitly primed with words related to the stereotype of elderly people (example: Florida, forgetful, wrinkle). While the words did not explicitly mention speed or slowness, those who were primed with these words walked more slowly upon exiting the testing booth than those who were primed with neutral stimuli.[79] Similar effects were found with rude and polite stimuli: those primed with rude words were more likely to interrupt an investigator than those primed with neutral words, and those primed with polite words were the least likely to interrupt.[79] A 2008 study showed that something as simple as holding a hot or cold beverage before an interview could result in pleasant or negative opinion of the interviewer.[82]
These findings have been extended to therapeutic interventions. For example, a 2012 study suggested that presented with a depressed patient who "self-stereotypes herself as incompetent, a therapist can find ways to prime her with specific situations in which she had been competent in the past... Making memories of her competence more salient should reduce her self-stereotype of incompetence."[83]
See also
- Intertrial priming
- Implicit association test
- Priming (media)
- Framing (social sciences)
- Overton window
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