There are an extreme number of disorders and diseases that can lead to both hallucinations and delusions.
I'll cover some brief causes here:
The advancement of blindness due to glaucoma and other diseases may lead to a condition called Charles-Bonnet syndrome in which the patient hallucinates basic shapes, although in more advanced forms of this condition a patient may hallucinate highly complex forms such as people.
Delusions such as Capgras occur when the emotional centers of the brain are severed from the visual centers leading to this strange condition in which a patient may start to believe that a member of their family has been replaced.
Certain types of epilepsy (TLE - Temporal Lobe Epilepsy), as well as schizophrenia, may influence hyper religiosity even in those not previously religious. They may start to experience euphoric experiences...an in extreme states may hallucinate hearing the voice of God.
Parkinsonian delusions and psychosis may occur as a result of over-indulging on medication which increases the levels of dopamine.
Dementia with Lewy bodies may also contribute to hallucinations and delusions.
Even something like a migraine may lead to the patients experiencing blank spots in their vision known as scotomas. And even hallucinate geometric shapes and patterns.
A strange delusion in which the patient believes they have died is known as Cotard's syndrome.
Denial of one's illness often occurs in cases of stroke, where a patient unable to move a limb on one side of the body denies this inability and provides many excuses why they won't move the limb. This denial of disease is called anosognosia.
In short, there are a plethora of diseases and disorders which influence the production of delusions and hallucinations. Psychopaths may indeed suffer from these conditions - however one would have to exercise caution that the psychopath themselves are not setting up an alibi of mitigating circumstances.
Here is a list of resources to further the understanding of the conditions mentioned:
There are an extreme number of disorders and diseases that can lead to both hallucinations and delusions.
I'll cover some brief causes here:
The advancement of blindness due to glaucoma and other diseases may lead to a condition called Charles-Bonnet syndrome in which the patient hallucinates basic shapes, although in more advanced forms of this condition a patient may hallucinate highly complex forms such as people.
Delusions such as Capgras occur when the emotional centers of the brain are severed from the visual centers leading to this strange condition in which a patient may start to believe that a member of their family has been replaced.
Certain types of epilepsy (TLE - Temporal Lobe Epilepsy), as well as schizophrenia, may influence hyper religiosity even in those not previously religious. They may start to experience euphoric experiences...an in extreme states may hallucinate hearing the voice of God.
Parkinsonian delusions and psychosis may occur as a result of over-indulging on medication which increases the levels of dopamine.
Dementia with Lewy bodies may also contribute to hallucinations and delusions.
Even something like a migraine may lead to the patients experiencing blank spots in their vision known as scotomas. And even hallucinate geometric shapes and patterns.
A strange delusion in which the patient believes they have died is known as Cotard's syndrome.
Denial of one's illness often occurs in cases of stroke, where a patient unable to move a limb on one side of the body denies this inability and provides many excuses why they won't move the limb. This denial of disease is called anosognosia.
In short, there are a plethora of diseases and disorders which influence the production of delusions and hallucinations. Psychopaths may indeed suffer from these conditions - however one would have to exercise caution that the psychopath themselves are not setting up an alibi of mitigating circumstances.
Here is a list of resources to further the understanding of the conditions mentioned:
https://www.nhs.uk/conditions/charles-bonnet-syndrome/
https://www.sciencedirect.com/topics/neuroscience/capgras-delusion
http://arno.uvt.nl/show.cgi?fid=114836
https://pmj.bmj.com/content/81/960/644
https://academic.oup.com/brain/article/130/6/1690/292406
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4271387/
https://www.nami.org/About-Mental-Illness/Common-with-Mental-Illness/Anosognosia