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{{Science}}
{{TSP}}{{Nihongo|'''Precognition'''|{{Ruby|予知能力|プレコグニション}}|Yochi Nōryoku (Purekogunishon)}} is an [[esper]] ability that allows its user to acquire information about the future.<ref name=ItemV3Ch3Pt5>{{Qvl|Item|L|3}} Chapter 3 Part 5</ref><ref name=ItemV3BTL3>{{Qvl|Item|L|3}} Between the Lines 3</ref>
<!--The term has not appeared in the original Japanese version of the ''Toaru Majutsu no Index'' light novels. (no longer applicable as of Item V3, check whether appeared before then-->
==Principles==
Also called future sight or second sight, precognition is a type of extrasensory perception that would involve the acquisition of future information that cannot be deduced from presently available and normally acquired sense-based information. In parapsychology, precognition (from the Latin ''præ-'', "before" + ''cognitio'', "acquiring knowledge"), a premonition (from the Latin ''praemonēre'') and a presentiment are information about future events that is perceived as emotion. It, along with [[Clairvoyance]], [[Psychometry]], [[Telepathy]], and [[Psychokinesis]], is one of the 6 attributes that is are measured in their [[System Scan]].<ref name=RailgunEp14>{{Qal|Railgun|E|14}}</ref>

===Known Variations===
*[[Far Vision]]: An esper ability referenced by [[Uiharu Kazari]] in the {{Qvl|Index|L|8|eighth ''Toaru Majutsu no Index'' light novel volume}}. Little is known about it but it can be assumed that it predicts the future.<ref name=IndexV8Ch2Pt1>{{Qvl|Index|L|8}} Chapter 2 Part 1</ref> Interestingly, the kanji used by Far Vision (予知), can be translated as Precognition as well.
*[[Thoughtography]]: An esper ability that first appeared in ''Toaru Kagaku no Railgun,''<ref name=RailgunEp14/> used by [[Miyama Shaei]]. The power allows the user to look in the future and allow them to display pictures of it in a medium. The espers can apparently either use analog cameras for the photograph or use a digital camera.<ref name=RailgunEp3>{{Qal|Railgun|E|3}}</ref>

===Non-esper usage of the term===
====Premonition Perception====
Literally referred in the original Japanese novels as {{Nihongo|'''Premonition Perception''' or '''sense of foreboding'''|前兆の感知|Zenchō no Kanchi}} but translated as '''Precognition''' in the ''[[Baka-Tsuki]]'' translations, Premonition Perception is the term used by characters to refer to the skill unconsciously developed by [[Kamijou Touma]] through his many battles.

This ability of [[Kamijou Touma]] was first speculated by [[Accelerator]], who has been in so many fights that he can subconsciously anticipate the attacks coming his way. Moreover, probably combined with his reflexes and the courage to keep his body and thoughts moving, allow him to judge accurately what to do next. Minute changes in the battlefield, like [[Misaka Mikoto]] exuding her electromagnetic field that makes metal items around her resonate, these involuntary movements of hers that not even she can detect, aid Touma in his judgment in where to put his [[Imagine Breaker]]. The narrative refers to such phenomena that can be perceived by Touma as "An Involuntary Movements", but implies that its scope differs to the term [[AIM]], and most likely uses it in a literal sense, as in actions that are not voluntary in the part of one who is doing it, like blinking. Mikoto's [[Electromaster#Railgun_.28special_move.29|railgun]] attack was over three times the speed of sound, and lightning strikes were even faster. Even with a method of defending himself, to be able to time it right was extremely difficult, missing the timing by only an instant would probably result in death. Moreover, it is noted that if he actively tries to take note of these things (referring to the information that he subconsciously takes in and react to), this skill of his is more likely to fail. Furthermore, [[Lessar]] noted that even if someone else were to have the same "right hand" like Touma, they couldn't use it half as well as Touma, with his combat skills that accompany it.<ref name=IndexV22Ch4Pt5>{{Qvl|Index|L|22}} Chapter 4 Part 5</ref>

Later when fighting [[Leivinia Birdway]], she attacks Touma with countless daggers of water that are packed so fully that it leaves no space for him to hide or evade. But it does not work, for Touma negates a dagger, a dagger that would specifically cause all others to be thrown out of the way after breaking into pieces in a chain reaction that created a blank spot that should not have been there.<ref name=ShinyakuV6Ch4Pt5>{{Qvl|Shinyaku|L|6}} Chapter 4 Part 5</ref>

It is shown by [[Rensa]] that Touma's precognition can be sealed by restricting the information that is shown to him. In the [[Shinyaku Toaru Majutsu no Index Light Novel Volume 07|seventh light novel]] of ''Shinyaku Toaru Majutsu no Index'', she controls her [[cyborg]] body in such a way that she completely freezes her facial expression, prevents even the slightest involuntary muscle movements, and times her blinking and breathing to specific set intervals in such a way that Touma will not be able to 'read' her based on those things. However, when Rensa is overloaded because of the presence of [[Yakumi Hisako]] in her, and flinches slightly because of her inability to stay still, Touma can easily read her movements and use precognition.<ref name=ShinyakuV7Ch4Pt5>{{Qvl|Shinyaku|L|7}} Chapter 4 Part 5</ref>

====Comeback Detection====
Named such by ''Railgun'' manga editor [[Ogino Kentarou]],<ref name=OginoKentarou0422>{{TwTrack}}[https://twitter.com/gouranga_/status/1251186175806562320?s=20 Ogino Kentarou (Railgun editor), Twitter]. Retrieved on 22 April 2020.</ref> {{Nihongo|'''Comeback Detection'''|逆転看破|Gyakuten kanpa}} is the name given to [[Kihara Gensei]]'s ability to sense his opponents plotting something and having a last trump card to play. Similar to Touma's precognition,<ref name=OginoKentarou0422/> after years in the [[Dark Side of Academy City]], Gensei is able to see through someone's mannerisms and subconscious tells to know they are planning something, which he can avoid by being more cautious.<ref name="RailgunCh65">{{Qcl|Railgun|65}}</ref>

==Known Users==
*[[Yamagami Erina]]

==References==
{{Reflist}}
[[Category:Terminology]]
[[Category:Science]]
[[Category:Esper Abilities]]