<p>Rober English when eren has to turn into a titan he has to inflict damage on himself and have a clear goal so i'm guessing that when eren was a child he never had a goal like block the cannon or kill the titans</p>

CC BY-SA 3.0
2014-01-10T14:11:50.953Z
Your answer issent wrong but his power also activates with smaller goals. For example episode 19 at the 11th minute his goal is : Pick up the spoon. Gets schocked by the spoon. hand goes full titan mode
Dimitri mx
CC BY-SA 3.0
2014-01-10T08:19:16.390Z
2014-01-10T08:19:16.390Z
Rjps 9
<p>Its triggered by any injury that causes blood loss like Eren biting his finger but Eren must focus on a certain goal in order to trigger his titan form like for example <code>kill all titans</code> or it can be <code>protecting Mikasa and Armin</code></p>

CC BY-SA 3.0
2014-08-16T03:11:19.507Z
I think your misunderstanding the question. It's asking how ***does*** Eren know/remember how to activate his Titan powers, not how to activate it.
Izumi-reiLuLu
CC BY-SA 3.0
2014-08-07T03:35:19.600Z
2014-08-07T03:35:19.600Z
NatsuDragneel
<p>He remembers how because when they explained how he turned into a titan it showed a flashback and his dad said "let these memories cloud your mind".  </p>

CC BY-SA 3.0
2014-11-19T12:49:24.920Z
I have removed your "biggest question", but you can always [ask your own](http://anime.stackexchange.com/questions/ask) in a new post, instead of in an answer.
JNat
CC BY-SA 3.0
2014-11-19T05:38:48.460Z
2014-11-19T12:48:38.493Z
2014-11-19T12:48:38.493Z
apple
<p>I would imagine in order to transform the first time that you would have to be in very clear danager and would subconsciesly desire the change. He didn't have any concept that he could and something like getting cut on a tree would certainly not be dangerous enough to warrent the subconsciese into activating. </p>

<p>I would wager though that once he changed the first time and figure out he could do it it bacame much easier because he knew he could. It would be like discovering a secret talent that you had (wiggling your ears or something). You technically could always do it but without strong reason (someone telling you to try) you would never knew you could. Once you discovered you could, it would be much easier to access. (sorry if that's a bad example, not a lot of parallels to turning into a titan :p )</p>

<p>Another idea (though less likely imo) is that age has something to do with it. Maybe you have to mature to a certain point before it's possible. It just happened that he was finally of age/ ability at that point to turn and, with the obvious situation of being eaten, could at that point turn. </p>

CC BY-SA 3.0
2015-09-29T19:50:39.567Z
This is more of a comment than an answer. Most importantly it's lacking sources for the claims made.
mivilar
CC BY-SA 3.0
2014-08-05T15:50:25.593Z
2014-08-05T15:50:25.593Z
Ben
<p>I don't know how far the anime is yet, so I'll put it into a spoiler.</p>

<blockquote class="spoiler">
  <p> The shift between human is triggered by any injury that causes blood loss. The first shift is triggered when Eren gets eaten by one of the titans and hurts his arm. To trigger the next one, he bites himself to protect Mikasa and Armin. Apparently, also the will to accomplish something is needed to become a titan (kill the titans, save his friends)</p>
</blockquote>

CC BY-SA 3.0
2014-08-03T06:26:51.893Z
there is incident where he was told to transform but could not but later his arm transform when try to pick Spoon. it happen levy brings him for research.
mirroroftruth
CC BY-SA 3.0
2014-08-05T17:07:54.193Z
With the exception of getting chewed by a titan, wasn't all of his bloodletting selfmutilation?
kaine
CC BY-SA 3.0
2013-07-26T20:40:31.873Z
So the first time he transforms it's basically by accident.
uncle brad
CC BY-SA 3.0
2013-07-26T20:43:09.810Z
@unclebrad: Yep.
looper
CC BY-SA 3.0
2013-08-15T15:23:04.340Z
Is that to say that Erin had never cut himself accidentily or otherwise before in his entire life? That seems a little unlikely to be honest. No kid goes through childhood without scraped knees or clumsy cuts from sharp objects.
Robert English
CC BY-SA 3.0
2013-08-15T15:48:08.237Z
@RobertEnglish He was hurt before for sure, but there was never a real reason to transform. As written, it seems like he needs the will to accomplish something.
looper
CC BY-SA 3.0
2013-08-16T07:10:21.443Z
This still leaves room for chiildhood bullies(and the will to beat them),  or the countless times he could have been injured (it's noted he's the most motivated of all the recruits) during his training as a soldier.
Robert English
CC BY-SA 3.0
2013-08-16T07:51:19.553Z
@RobertEnglish I doubt that bullies feel bad enough for transforming to a titan and killing them.
looper
CC BY-SA 3.0
2013-07-26T07:52:21.250Z
2013-07-26T07:52:21.250Z
looper
<p>Eren's father injects him with the Titan serum years before he first uses it.  So how is it that he remembers how to activate it?</p>

CC BY-SA 3.0
2013-07-26T06:51:20.557Z
In ep. 15 Eren is asking himself the same question. So I think we'll find out later or you can check manga for spoilers.
Qiu
<attack-on-titan>
Why/How does Eren remember how to activate his Titan power?
# Why/How does Eren remember how to activate his Titan power?
Posted by: username_0 on 2013-07-25
Eren's father injects him with the Titan serum years before he first uses it. So how is it that he remembers how to activate it?
**Tags:** attack-on-titan
> **Comments:**
> **username_1**: In ep. 15 Eren is asking himself the same question. So I think we'll find out later or you can check manga for spoilers.  
---
## 5 answers
### Answer by username_10 on 2013-07-26. Score: 20 | Accepted answer
I don't know how far the anime is yet, so I'll put it into a spoiler.

> The shift between human is triggered by any injury that causes blood loss. The first shift is triggered when Eren gets eaten by one of the titans and hurts his arm. To trigger the next one, he bites himself to protect Mikasa and Armin. Apparently, also the will to accomplish something is needed to become a titan (kill the titans, save his friends)
> **Comments:**
> **username_0** (2013-07-26): So the first time he transforms it's basically by accident.  
> **username_10** (2013-07-26): @unclebrad: Yep.  
> **username_13** (2013-08-15): Is that to say that Erin had never cut himself accidentily or otherwise before in his entire life? That seems a little unlikely to be honest. No kid goes through childhood without scraped knees or clumsy cuts from sharp objects.  
> **username_10** (2013-08-15): @RobertEnglish He was hurt before for sure, but there was never a real reason to transform. As written, it seems like he needs the will to accomplish something.  
> **username_13** (2013-08-16): This still leaves room for chiildhood bullies(and the will to beat them),  or the countless times he could have been injured (it's noted he's the most motivated of all the recruits) during his training as a soldier.  
> **username_10** (2013-08-16): @RobertEnglish I doubt that bullies feel bad enough for transforming to a titan and killing them.  
> **username_11** (2014-08-03): there is incident where he was told to transform but could not but later his arm transform when try to pick Spoon. it happen levy brings him for research.  
> **username_12** (2014-08-05): With the exception of getting chewed by a titan, wasn't all of his bloodletting selfmutilation?  
---
### Answer by username_2 on 2014-01-10. Score: 0
Rober English when eren has to turn into a titan he has to inflict damage on himself and have a clear goal so i'm guessing that when eren was a child he never had a goal like block the cannon or kill the titans
> **Comments:**
> **username_3** (2014-01-10): Your answer issent wrong but his power also activates with smaller goals. For example episode 19 at the 11th minute his goal is : Pick up the spoon. Gets schocked by the spoon. hand goes full titan mode  
---
### Answer by username_4 on 2014-08-07. Score: 0
Its triggered by any injury that causes blood loss like Eren biting his finger but Eren must focus on a certain goal in order to trigger his titan form like for example `kill all titans` or it can be `protecting Mikasa and Armin`
> **Comments:**
> **username_5** (2014-08-16): I think your misunderstanding the question. It's asking how ***does*** Eren know/remember how to activate his Titan powers, not how to activate it.  
---
### Answer by username_6 on 2014-11-19. Score: -2
He remembers how because when they explained how he turned into a titan it showed a flashback and his dad said "let these memories cloud your mind".
> **Comments:**
> **username_7** (2014-11-19): I have removed your "biggest question", but you can always [ask your own](http://anime.stackexchange.com/questions/ask) in a new post, instead of in an answer.  
---
### Answer by username_8 on 2014-08-05. Score: -3
I would imagine in order to transform the first time that you would have to be in very clear danager and would subconsciesly desire the change. He didn't have any concept that he could and something like getting cut on a tree would certainly not be dangerous enough to warrent the subconsciese into activating.

I would wager though that once he changed the first time and figure out he could do it it bacame much easier because he knew he could. It would be like discovering a secret talent that you had (wiggling your ears or something). You technically could always do it but without strong reason (someone telling you to try) you would never knew you could. Once you discovered you could, it would be much easier to access. (sorry if that's a bad example, not a lot of parallels to turning into a titan :p )

Another idea (though less likely imo) is that age has something to do with it. Maybe you have to mature to a certain point before it's possible. It just happened that he was finally of age/ ability at that point to turn and, with the obvious situation of being eaten, could at that point turn.
> **Comments:**
> **username_9** (2015-09-29): This is more of a comment than an answer. Most importantly it's lacking sources for the claims made.  
---
