Reading Steiner

Reading Steiner is a term coined by Rintaro Okabe, referring to his unique ability of retaining memory of events as they occurred before the switch after switching world lines. The ability plays a major role in the plot, most prominently in allowing Okabe to undo the changes caused by the D-Mails and not losing track after each switch. In the anime, there is a visual distortion every time Reading Steiner is activated, often following the sending of a D-mail.

Introduction
Okabe would eventually discover that everyone has Reading Steiner in some capacity, though he would remain the sole character in the series who is shown to have Reading Steiner strong enough to retain all of his memories following a world line shift.

On many Beta world lines, the general population unknowingly experiences notable Reading Steiner. On 1.382733β, this ability is referred to as President's Disease, as those with this ability remember Puchin as the President of Russia instead of General Secretary of the Soviet Union. On other world lines of the Beta Attractor Field, Reading Steiner is minimal and treated as a new form of encephalitis.

Other relevant characters have been known to experience stronger forms of Reading Steiner due to Okabe's involvement. As a result of some sort of reflection, they seem to regain fragments of these memories occasionally.


 * On 0.409431α, Faris NyanNyan remembers her D-Mail from 0.456903α that prevented her father's death and transformed Akihabara after escaping the Viral Attackers, after being talked through events with Okabe's assistance,
 * On 0.456914α, Luka Urushibara remembers her first meetings with Okabe on various other world lines as a male, after Okabe assists by prompting a discussion surrounding their meeting.
 * On 0.571046α, Mayuri Shiina visits her grandmother's grave, explaining to her granny that she remembers "nightmares" in which she dies in a multitude of ways. Her Reading Steiner is depicted as strong as she is able to remember these events without Okabe's assistance, rather her recollection comes from his involvement in trying to prevent said deaths.
 * On 1.129848β, Katsumi Nakase is able to vaguely recall Mayuri's death from various world lines as a "dream" of sorts. Her Reading Steiner is depicted to be strong as she recalls these events without Okabe's assistance, rather her recollection comes from Okabe in these iterations prompting reflection in the form of a short-lived hypothetical.
 * On 1.048596%, or the "Steins Gate" world line, Kurisu Makise instinctively recalls Alpha world line memories midway through an interaction with Okabe, bewildering even herself mere seconds later.
 * In 1.081163β, Amadeus Kurisu seemingly inherits memories from a prior world line immediately before its deletion, somehow knowing about Steins Gate and Hououin Kyouma.

Trivia

 * The movie Steins;Gate: The Movie - Load Region of Déjà vu features Reading Steiner as an important plot element, as Kurisu and Mayuri use recollection of the pre-Steins Gate world lines to piece together information about Okabe.
 * In popular culture, the Mandela effect is similar to Reading Steiner.