Impact of one experience on a later one
Priming is a concept in psychology to describe how exposure to one stimulus may influence a response to a subsequent stimulus, without conscious guidance or intention. The priming effect is the positive or negative effect of a rapidly presented stimulus (priming stimulus) on the processing of a second stimulus (target stimulus) that appears shortly after. Generally speaking, the generation of priming effect depends on the existence of some positive or negative relationship between priming and target stimuli. For example, the word "nurse" might be recognized more quickly following the word "doctor" than following the word "bread". Priming can be perceptual, associative, repetitive, positive, negative, affective, semantic, or conceptual. Priming effects involve word recognition, semantic processing, attention, unconscious processing, and many other issues, and are related to differences in various writing systems. How quickly this effect occurs is contested; some researchers claim that priming effects are almost instantaneous.
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, or between semantically related words such as "doctor" and "nurse".
In 2012, a great amount of priming research was thrown into doubt as part of the replication crisis. Many of the landmark studies that found effects of priming were unable to be replicated in new trials using the same mechanisms. The experimenter effect may have allowed the people running the experiments to subtly influence them to reach the desired result, and Publication bias tended to mean that shocking and positive results were seen as interesting and more likely to be published than studies that failed to show any effect of priming. The result is that the efficacy of priming may have been greatly overstated in earlier literature, or have been entirely illusory.
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. Positive priming is caused by simply experiencing the stimulus, while negative priming is caused by experiencing the stimulus, and then ignoring it. Positive priming effects happen even if the prime is not consciously perceived. The effects of positive and negative priming are visible in event-related potential (ERP) readings.
Positive priming is thought to be caused by spreading activation. 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. In the distractor inhibition model, the activation of ignored stimuli is inhibited by the brain. 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. Although both models are still valid, recent scientific research has led scientists to lean away from the distractor inhibitor model.
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.
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.
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. This effect has been found on words in the lexical decision task. There are multiple theories and models that reason why repetition priming might exist. For example, facilitation suggests that when a stimulus overlaps with existing or previously seen representation than information will travel faster. 
Semantic priming.
In semantic priming, the prime and the target are from the same semantic category and share features. For example, the word "dog" is a semantic prime for "wolf", because the two are similar animals. Semantic priming is theorized to work because of spreading activation within associative networks. When a person thinks of one item in a category, similar items are stimulated by the brain. Even if they are not words, morphemes can prime for complete words that include them. An example of this would be that the morpheme 'psych' can prime for the word 'psychology'.
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.
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"). 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. 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.
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. 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.
Masked priming.
The masked priming paradigm has been widely used in the last two decades in order to investigate both orthographic and phonological activations during visual word recognition.
The term "masked" refers to the fact that the prime word or pseudoword is masked by symbols such as ###### that can be presented in a forward manner (before the prime) or a backward manner (after the prime). These masks enable to diminish the visibility of the prime. The prime is usually presented less than 80 ms (but typically between 40-60 ms) in this paradigm. In all, the short SOA (Stimuli Onset Asynchrony, i.e. the time delay between the onset of the mask and the prime) associated with the masking make the masked priming paradigm a good tool to investigate automatic and irrespective activations during visual word recognition. Forster has argued that masked priming is a purer form of priming, as any conscious appreciation of the relationship between the prime and the target is effectively eliminated, and thus removes the subject's ability to use the prime strategically to make decisions. Results from numerous experiments show that certain forms of priming occur that are very difficult to occur with visible primes. One such example is form-priming, where the prime is similar to, but not identical to the target (e.g., the words "nature" and "mature"). Form priming is known to be affected by several psycholinguistic properties such as prime-target frequency and overlap. If a prime is higher frequency than the target, lexical competition occurs, whereas if the target has a higher frequency than the prime, then the prime pre-activates the target and if the prime and target differ by one letter and one phoneme, the prime competes with the target, leading to lexical competition. Not only is it affected by the prime and target, but also by individual differences such that people with well-established lexical representations are more likely to show lexical competition than people with less-established lexical representation.
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. 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. Affective priming might also be more diffuse and stronger when the prime barely enters conscious awareness. 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.
Cultural priming.
Cultural priming is a technique employed in the field of cross-cultural psychology and social psychology to understand how people interpret events and other concepts, like cultural frame switching and self-concept. For example, Hung and his associate displayed to participants a different set of culture related images, like U.S. Capitol building vs Chinese temple, and then watch a clip of fish swimming ahead of a group of fishes. When exposed to the latter one, Hong Kong participants are more likely to reason in a collectivistic way. In contrast, their counterparts who view western images are more likely to give a reverse response and focus more on that individual fish. People from bi-culture society when primed with different cultural icons, they are inclined to make cultural activated attribution. One method is the Pronoun circling task, a type of cultural priming task, which involves asking participants to consciously circle pronouns like "We", "us", "I", and "me" during paragraph reading.
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. 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). 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. 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