in selective attention, and response given are all retrieved automatically. When the repetitively ignored distractor stimulus is encountered as the target, a tag associated with the response to the stimulus is also retrieved. This response tag of a distractor will likely be "do-not-respond" tag as opposed to the "respond" tag of the target stimulus. Retrieval of the previous "do-not respond" tag of the stimulus conflicts with the current "respond" tag. This presents a problem of whether to respond or not. Resolving this conflict takes time and produces negative priming effect. Episode retrieval model has gained more popularity over the last decade compared to the distractor inhibition model due to the issues with long-term negative priming. Episode retrieval varies from the distractor inhibition model because it claims that the negative priming occurs only when the memory of the stimuli is retrieved and not during the encoding of the distractor stimuli. Recent findings lean towards this model but the model itself is not entirely complete. Its idea of association tags like the "do-not-respond" tag is vague and needs concrete evidence to support this model. Houghton–Tipper model Due to the issues found with the distractor inhibition model, Tipper and Houghton modified the distractor inhibition model to account for long-term negative priming effects. The original inhibition account proposed that inhibition occurs only when the distractors are suppressed. The Houghton–Tipper model revised this proposition and claims that inhibition occurs during both the encoding of distractors and the retrieval of that memory. The main reason for this change is to explain the long-term negative priming and justify it using the new combined model. When a repeated distractor becomes the target, processing of this stimulus automatically retrieves the memory of the stimulus being inhibited as a distractor. This model suggests that inhibition occurs when ignoring the distractor and during the memory retrieval of the previous ignorance of the stimulus. Therefore, it incorporates the inhibition account in selective attention and the episode retrieval model. Feature mismatch hypothesis This theory proposes that negative priming effect is the result of interference due to the target being located where the distractor was once located. When the target stimulus and distractor stimulus are repeatedly placed in the same location, we know their respective location and pay attention more to the location of the target than the target itself. Our response to the target is also faster because we have already identified where