CHRNA7 and schizophrenia: Certain genetic, age- and trauma-related neurodegenerative, sensorimotor, and psychiatric disorders characterized by cognitive decline and attention deficits (e.g., schizophrenia, dementia and traumatic brain injury) are directly associated with decreased cholinergic tone and a decrease, but not disappearance, of functional α7 nAChRs [10,49,117].