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| “ | Do you see that thing that fell out of me? What is that? It's not the surprise... I've never seen it before.
— GLaDOS curious about the Morality Core that fell off her.
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Cores are mechanical spheres that mostly appear near the end of Portal and Portal 2. They were developed by Aperture scientists specifically to regulate GLaDOS' merciless behavior, such as refraining her from flooding test chambers or other vital parts of Aperture Laboratories with Neurotoxin, and/or to control the entire facility.
Personality Cores
As the name implies, each Core has their own unique personality and behavior, which gets copied over the central core.
In Portal, whenever Chell dropped any of the Personality Cores into the Incinerator, not only did GLaDOS experience pain from losing them, but she started to lose her prominent traits, such as her conversations regarding Cake, her sarcasm, and her moral standings, leaving her intent on merely killing Chell.
Morality Core
| “ | ...
— The Morality Core on... nothing.
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The Morality Core is one of the cores attached to GLaDOS in Portal. It was installed onto GLaDOS some time ago to stop her from filling the enrichment Center with deadly Neurotoxin. It's the first core collected and incinerated by Chell, which causes GLaDOS to start losing her moral traits and once again start filling the room with Neurotoxin. Unlike other cores, the Morality Core is mute.
Curiosity Core
| “ | Who are you?
— The Curiosity Core asking Chell one of many questions.
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The second core attached to GLaDOS is the Curiosity Core. It tends to constantly ask questions, ranging from its surroundings, to Chell, to where it is going.
Intelligence Core
| “ | ...And sediment-shaped sediment.
— The Intelligence Core mentioning a cake ingredient.
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GLaDOS' third core, The Intelligence Core, also known as the Logic Core, goes on about an odd recipe for a rather unique kind of cake, which is the cake shown before the end credits of Portal. Due to losing this core, GLaDOS never brings up anything relating to cake in Portal 2.
Anger Core
| “ | *snarl* *snarl* *growl*
— The Anger Core on... everything.
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The last core attached to GLaDOS is the Anger Core. It is also referred to as the Emotion Core. All it does is snarl and growl ferociously at Chell. Once Chell put the Anger Core into the incinerator, GLaDOS began to implode. In Portal 2, GLaDOS, due to the loss of this core, sounded very mellow, barely expressing emotional signs of hostility.
Central Core
The Central Core is hardwired into the maintain of Aperture Laboratories and given the power to control and regulate the entire facility. Such power includes overseeing the events that occur, creating and stockpiling test chambers, and so on. Unlike the personality cores, the central core does not have to retain a spherical shape, just uncorrupted.
Wheatley
Corrupted Cores
Due to technical difficulties over time, a core may be automatically labeled as a Corrupted Core and would be subject to being automatically disposed of. However, if the corrupted core is the central core, a substitute core must be present in a core receptacle to initiate a core transfer. Once a substitute core is found, both cores must agree or disagree to the core transfer procedure. If one agrees while the other disagrees, the transfer process cannot occur unless a stalemate resolution associate is present to press the stalemate resolution button, which will initiate the core transfer process (which is a painful procedure given GLaDOS' and Wheatley's screams of agony during their core transfer process) once the associate has returned to the core transfer bay.
During the fight against Wheatley Portal 2, GLaDOS drops three of these cores to Chell for her to attach to Wheatley in order to make him corrupt enough to initiate another core transfer procedure.
Space Core
| “ | SPAAAAAAAAAAAAAAAAAAAAAAACE!!!
— The Space Core expressing his love for Outer Space.
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The Space Core is one of three active, corrupted cores. It has an unhealthy obsession over Outer Space and contantly expresses its desires to go to space in a rapid manner of speaking. It finally gets to live its dream of going to space when it gets sucked through the portal that connects the remaining blot of conversion gel to the Moon's surface.
Adventure Core
The second corrupted core, the Adventure Core (or as it calls itself, Rick) talks like a stereotypical American soldier. Upon seeing Chell, it starts to swoon over. It even tries (but to no avail) to convince Chell to take a "lady break" while it deals with Wheatley.
Fact Core
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The Fact Core is the third corrupted core. It constantly states several random, twisted "facts" related to history, the current situation, as well as apparent facts about how right and handsome it is.