Sri.PVIyer Sir, Greetings. Sorry, this post may be a bit graphic. Sri. KRS Sir, if you like to delete this, just go ahead; I don't mind.
Sir, the condition explained by you is just a 'cognitive impairement'. Cognitive impairement deals with the person's capacity to process the informations passed through the nervous system due to lack of seritonin. That is a different subject of discussion. Such persons feel pain just as anyone else does, because pain pathway is not the same as cognitive pathway. Let us eliminate that doubt at the start itself, please.
We have central nervous system(CNS) and systemic nervous system(SNS). CNS controls all the actions and snd signals to SNS for musculo-skeletal systems to function. Pain sensation gets conveyed by the SNS to CNS; processed by the CNS and SNS take directions from CNS.
CNS consists of spinal cord and brain. In other words, any living thing with a spine would feel pain. All the multicellular animals, including fish (except sponge) would feel pain, due to the spinal cord and brain.
Central nervous system - Wikipedia, the free encyclopedia
Pain gets transmitted by the nerve endings to the dorsal horn of the spinal cord. There are many dorsal horns in the spinal cord. Transmission of pain to the brain is known as 'affrent'; brain's reaction path is known as 'efferent'. - File:Spinal cord tracts - English.svg - Wikipedia, the free encyclopedia
The spinal cord is further divided for the human beings as cervical, thorasic, lumber and sacral portions. There are many segments in the spinal cord ( 7 in cervical, 12 in thorasic, 5 in lumber, 5 in sacrum). Each segment controls a portion of the body. The upward 'affrent' system is connected. If the portion of spinal cord at L3 gets anaesthesised (or made numb), feeling from thigh downwards would be absent.
More about spinal cord here - Spinal cord - Wikipedia, the free encyclopedia
Pain pathway -
pain gets transmitted from the SNS to CNS through nerve endings. Yes, there are decision centres and distribution points. Obviously, decision centre is the brain; distribution centres are the dorsal horns of the spinal cord.
More about pain can be read here - The WorldWide Anaesthetist Pain Page
So, what kind of a pain would an animal (or human being) suffer when the head gets chopped off or when the throat gets slit?
If I am a goat, I may not feel much of a pain at the incision/chopped off site, since the nerve endings are either completely gone or in the case of incision, only slight. Initially, due to bleeding, I go through hypovalemic shock. My heart works overtime to keep the pumping; my brain shuts of blood supply to outer limbs in a hurry; outer limbs starve of exygen goes into convulsions; I keep loosing blood; due to the lack of oxygen, all the cells in the outer limbs start burning before they die; one by one all the organs and the systems gets shut down; by this time, if I am lucky, due to the extreme pain transmission information overload, the system collapses and I faint ( at the extreme pain situations, we faint); Then slowly blood supply to brain stops; brain ceases to function; only then the heart stops pumping.
A stunned animal gets knocked out; so may not experience most of the above said stages. They do suffer less, in my opinion.
Babies, kids, children, adults or animals irrespectively feel the same kind of pain. Pain threshold may differ from person to person.
...To give you an example, there may be a human with lot of nerve problems , underdeveloped in intelligence as well.
Sir, the condition explained by you is just a 'cognitive impairement'. Cognitive impairement deals with the person's capacity to process the informations passed through the nervous system due to lack of seritonin. That is a different subject of discussion. Such persons feel pain just as anyone else does, because pain pathway is not the same as cognitive pathway. Let us eliminate that doubt at the start itself, please.
We have central nervous system(CNS) and systemic nervous system(SNS). CNS controls all the actions and snd signals to SNS for musculo-skeletal systems to function. Pain sensation gets conveyed by the SNS to CNS; processed by the CNS and SNS take directions from CNS.
CNS consists of spinal cord and brain. In other words, any living thing with a spine would feel pain. All the multicellular animals, including fish (except sponge) would feel pain, due to the spinal cord and brain.
Central nervous system - Wikipedia, the free encyclopedia
Pain gets transmitted by the nerve endings to the dorsal horn of the spinal cord. There are many dorsal horns in the spinal cord. Transmission of pain to the brain is known as 'affrent'; brain's reaction path is known as 'efferent'. - File:Spinal cord tracts - English.svg - Wikipedia, the free encyclopedia
The spinal cord is further divided for the human beings as cervical, thorasic, lumber and sacral portions. There are many segments in the spinal cord ( 7 in cervical, 12 in thorasic, 5 in lumber, 5 in sacrum). Each segment controls a portion of the body. The upward 'affrent' system is connected. If the portion of spinal cord at L3 gets anaesthesised (or made numb), feeling from thigh downwards would be absent.
More about spinal cord here - Spinal cord - Wikipedia, the free encyclopedia
Pain pathway -
pain gets transmitted from the SNS to CNS through nerve endings. Yes, there are decision centres and distribution points. Obviously, decision centre is the brain; distribution centres are the dorsal horns of the spinal cord.
More about pain can be read here - The WorldWide Anaesthetist Pain Page
So, what kind of a pain would an animal (or human being) suffer when the head gets chopped off or when the throat gets slit?
If I am a goat, I may not feel much of a pain at the incision/chopped off site, since the nerve endings are either completely gone or in the case of incision, only slight. Initially, due to bleeding, I go through hypovalemic shock. My heart works overtime to keep the pumping; my brain shuts of blood supply to outer limbs in a hurry; outer limbs starve of exygen goes into convulsions; I keep loosing blood; due to the lack of oxygen, all the cells in the outer limbs start burning before they die; one by one all the organs and the systems gets shut down; by this time, if I am lucky, due to the extreme pain transmission information overload, the system collapses and I faint ( at the extreme pain situations, we faint); Then slowly blood supply to brain stops; brain ceases to function; only then the heart stops pumping.
A stunned animal gets knocked out; so may not experience most of the above said stages. They do suffer less, in my opinion.
Babies, kids, children, adults or animals irrespectively feel the same kind of pain. Pain threshold may differ from person to person.