A not so well known fact is about Schizophrenia is that the individuals  having it, have less CO2 reactivity, but what about it? Does it really matters, what do you think?

Oxford Journal
In1948 Michitomo Hayashi (1885-1973) organized a schizophrenia
research group. At that time he was able to measure the cerebral arteriovenous differences in blood gas concentrations of schizophrenic patients. He correlated these differences with the course of schizophrenic episodes and found that in times of symptom remission there was an overproduction in the venous carbon dioxide concentration, indicating an increase of the respiratory quotient.

Cerebral blood flow responses to inhaled carbon dioxide in schizophrenia

Carbon dioxide (CO₂) is a potent cerebrovasodilator; even mild changes in CO₂ are associated with marked changes in cerebral blood flow (CBF). We measured CBF before and after 5% CO₂, inhalation in 19 medicated patients with schizophrenia and 16 normal volunteers. Another group of 16 volunteers had 2 CBF measurements under resting conditions. Although both patients and controls showed marked CBF increase during CO₂ inhalation, the CBF response was significantly less in the patients. Change in CBF per mm of CO₂ was lower in the patients. The second group of controls did not show significant differences between the 2 resting CBF measurements.

CO2  in near death experiences

The recent observations about why people see light’s in the end of the tunnel in the near death experience suggest that – Near-death experiences may result from elevated carbon dioxide levels in the blood: study NYtimes daily.  BBC
New light on near-death flashes. So of cause it can cause an extra vision here and there even if you have schizophrenia, in fact there are substances measured at persons with schizophrenia that halts the action of Carbonic Anhydrase, which is the enzyme that catalyses CO2.

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Coming up:
A new theory about the aetiology of schizophrenia.