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When demons possess a person, my world has a stylized framework for how they will manipulate and terrorize the victim. This is determined by which lobe of the brain the demons incubate in:

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From which point, the demon "grows" and in most cases, the demon's agenda is to hijack that region of the brain with the physiological effect of turbo-charged neural activity there. For reference, occipital lobe demons tend to induce manic hallucinations while temporal lobe demons tend to use the victim as a pulpit to scream blasphemes. And so forth for other regions of the brain. While the frontal lobe seems to be very important, I'm not sure that turbo-charged activity there would necessarily be the worst-case scenario.

Question

What this question aims to investigate, is which region of the brain, if neural activity was turbo-charged there, would be most threatening to the victim after being exorcised of the demon. So which lobe would likely lead to the most lingering psychological damage?

Clarification: I'm assuming the burn-out rates of the lobes don't have meaningful differences. If there is reason to suspect otherwise, answerers can riff on that, as that would probably go into the risk factor when examining the different effects of the demon's lobe choice.

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    $\begingroup$ How does a turbo-charged brain works? I don't see any pistons and related shenanigans in the skull. $\endgroup$
    – L.Dutch
    Commented Aug 19, 2022 at 5:44
  • $\begingroup$ @L.Dutch Just a figure of speech, but you may be interested in en.wikipedia.org/wiki/Electroencephalography $\endgroup$ Commented Aug 19, 2022 at 6:14
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    $\begingroup$ But if you don't explain how that happens, we cannot figure what the potential damages may be $\endgroup$
    – L.Dutch
    Commented Aug 19, 2022 at 6:30
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    $\begingroup$ @L.Dutch A turbo-charged brain gets worse gas mileage, but has more horsepower and acceleration. This is dangerous because most brain pilots haven't installed quality racing tires, and therefor suffer from poor turning radius and grip, often spinning off the track. It is recommended that new demons should drive slowly and with caution, and perhaps enroll in racing lessons to learn how to handle these turbo-charged brains. $\endgroup$
    – John O
    Commented Aug 19, 2022 at 13:36
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    $\begingroup$ -1 and VTC:Needs Details for trying to keep how a turbo-charged brain works a "black box." Users do that believing they'll get a wider array of answers to choose from, but that's intrinsically contrary to how SE and this Stack work. Brainstorming isn't why we're here (see help center). @L.Dutch is right, if you don't explain how your possession works, then the answers are just opinion-based guesses. $\endgroup$
    – JBH
    Commented Aug 20, 2022 at 3:28

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So, taking your idea of a turbo charged brain as acting similarly to a brain in an epileptic fit state, that is, receiving too many inputs, your classic interpretation of an epileptic fit is a frontal lobe seizure or overload. That's the strange twitching, postures, loss of voluntary muscle control etc.

Assuming that what you mean by the idea of turbocharging a brain and then the idea of damage left afterwards might follow a similar pattern, and using some very vague neuroscientific knowledge gained from my own head injury, here's what I think you might expect those people to feel afterwards.

Damage to the Frontal Lobe:

From Headway - the brain injury charity

  • Changes in personality.
  • Difficulties with attention and taking in information.
  • Emotional responses may be reduced.
  • Difficulties with motivation (Apathy) or getting things started (Initiation).
  • Changes in the ability to control behaviour (Disinhibition). This means that the person may be more impulsive. They may say or do things without considering the consequences.
  • Reduced self-awareness (Anosagnosia). Poor judgment and decision-making.
  • Difficulty planning things and meeting goals. ‘Black and white’
    thinking (Concrete Thinking).
  • Irritability and less tolerance of frustration.

The frontal lobe is also often indicated in dementia, and is the area that is severed in a lobotomy, giving rise to the idea of a zombified human. As the frontal lobe also controls voluntary movement, damage to this could damage your ability to make voluntary and purposeful movements, meaning you would possibly be able to catch or at least fend off the ball headed straight for your face, but not to pick it up and throw it back.

As your memories would be intact, you might have some awareness of the change in your personality and definitely an awareness of the change in your physical skill, which is distressing and frustrating.

Damage to the Temporal Lobe: The temporal lobe contains the hippocampus, and is essentially the seat of memory. Again, from Headway

  • Difficulty in recognising faces, things or places.
  • Difficulty understanding or remembering what people say.
  • Difficulty reading.
  • Difficulty recognising objects.
  • Short-term memory difficulties.
  • Changes in sexual behaviour.
  • Increased aggression

I can offer the personal experience here after a really nasty head injury centred on my temporal lobe, that the effects of this are distressing. Acutely, I kept finding myself in places with no idea how i'd got there. I would get trapped on the sides of roads because the car headlights were too confusing to me to understand, I got absolutely furious with everyone around me because there were concepts that felt very important to communicate that I had absolutely no way of telling. Mine was mixed in with some temporal lobe damage so in addition to slurring the words I could remember, I also fell over a lot. Fun times!

Damage to the Parietal Lobes:

The parietal lobes are your sensing and touching lobes essentially, from Headway, once more.

  • Difficulty naming objects (Anomia).
  • Difficulty in distinguishing left from right.
  • Difficulties with hand-eye coordination.
  • Difficulty making sense of what we see even if we do not have a visual impairment (Visual Perceptual difficulty).
  • Difficulty knowing the function of an object.
  • Problems with reading (Alexia), writing (Agraphia) or maths (Dyscalculia).
  • Difficulty knowing where things are in relation to our own bodies; for example, how close an object is to us (Spatial Awareness Difficulties).
  • Reduced self-awareness (Anosognosia).
  • Visual Neglect.

Outside of the ordinary unpleasant symptoms of an injury or effect of something messing up your parietal lobes, this one I think has the propensity to be the most horrifying. The parietal lobes are sort of one major part of what tells you if something is going to be sharp or hot or dangerous or otherwise something to be avoided. Without that collision avoidance you can and would walk merrily into a big old rusty metal spike and not notice it was a bad thing until the pain arrived from your extremities. If there's any damage at all to that nerve function, suddenly you've got a massive wound you know nothing about until you happen to glance down.

Damage to the Occipital Lobe: There's no helpful list for this one, but it controls your visual cortex primarily. Damage to the occipital lobe might make you blind, or might give you visual disturbances, or a bit of both. It could be partial blindness, and it's not the sort that can be fixed with glasses because there's nothing necessarily wrong in the eyes.

Damage to the Cerebellum: Not strictly a lobe but as its in your picture i've included it.

Damage to the cerebellum affects your motor skills and balance, in cats with a condition called cerebellar hypoplasia, they have what's called a "drunken sailor" walk. (also available in other mammals).

Damage to the cerebellum could entail:

  • loss of coordination of motor movement (asynergia)
  • the inability to judge distance and when to stop (dysmetria)
  • the inability to perform rapid alternating movements (adiadochokinesia)
  • movement tremors (intention tremor)
  • staggering, wide based walking (ataxic gait)
  • tendency toward falling
  • weak muscles (hypotonia)
  • slurred speech (ataxic dysarthria)
  • abnormal eye movements (nystagmus)

Based on those classifications for what happens when damage occurs to the lobe, you could reasonable construe those are the sorts of things that might happen when a demon took up residence in there. So in your example of a frontal lobe, a demon could potentially puppeteer the person whilst they remained aware of it, changing their personality but not their perceptions necessarily.

There's a reasonable argument to say that amount of time spent in residence successfully could be linked to electrical activity in those regions of the brain. Certainly there isn't, so far as we can currently tell, consistent blood flow and electrical activity to all areas of the brain all the time, but the brain is, incredibly difficult to study. You might argue that by dint of being smaller physically the smaller lobes get less blood flow and can thus generate less electricity and so would last a shorter time? But honestly it's an argument for which there is currently no right (scientifically backed) answer.

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