A person who inappropriately talks loudly in a religious service, or who comments out loud on the service or other attendees is 'disinhibited' and is suffering from disease in the frontal lobes of the brain. This is detailed in the discussion of many of the other symptoms that relate to impaired frontal lobe function, or impaired executive function Executive function
Includes the behaviors associated with judgment, agitation and social behavior - not memory. These behaviors are affected in all dementias, but especially in frontotemporal dementia., such as loss of interest, loss of insight or irritability and frustration.

With respect to what is happening in the brain of a person with dementia who is in spiritual crisis, it is tempting to write 'God only knows'. The area of spirituality is a tough intersection between faith and science. Everything that we experience is experienced in our brains, but knowing every synapse Synapse
The junction where a signal is transmitted from one neuron to another, in order to communicate. It is usually a neurotransmitter which crosses this junction to the next neuron. and every neuron Neuron
The basic working unit of the nervous system. The nerve cell is typically composed of a cell body containing the nucleus, dendrites, and the axon. They send signals that control the actions of other cells in the body, such as other nerve cells and muscle cells. would still not let us know how someone else feels. There is no doubt that the empathetic and intellectual ability to be spiritual can become diminished as dementia progresses. There is equally no doubt that reducing spiritual experience to neuronal circuit diagrams is meaningless. Crises of spirituality require spiritual advisors more than medical ones.