RFR can adversely affect nerve cells   Kim, Ju Hwan, et al. “Long-term exposure to 835 MHz RF-EMF induces hyperactivity, autophagy and demyelination in the cortical neurons of mice.” , 2017The neuronal effects of 835 MHz RF-EMF on the cerebral cortex of the mouse brain at 4.0 W/kg for 5 hours/day for 12 weeks included induction of autophaygy genes, production of proteins, accumulation of autolysosome, demyelination in cortical neurons and hyperactivity-like behaviour.
RFR can reduce total pyramidal cell number in the brainBas, O., et al. “Chronic prenatal exposure to the 900 megahertz electromagnetic field induces pyramidal cell loss in the hippocampus of newborn rats.” 2009It was found that 900 megahertz of electromagnetic field significantly reduced the total pyramidal cell number in the cornu ammonis of the electromagnetic field group (P < 0.001). 
Decline in cognitive function with exposure to RFRDeshmukh, Pravin Suryakantrao, et al. “Cognitive impairment and neurogenotoxic effects in rats exposed to low-intensity microwave radiation.”  2015Rats exposed to low-intensity microwave radiation showed declined cognitive function, elevated HSP70 level, and DNA damage within the brain, compared to control animals.  
RFR may adversely affect memoryNtzouni, Maria P, et al. “Transient and cumulative memory impairments induced by GSM 1.8 GHz cell phone signal in a mouse model.”  2013The data suggest that visual information processing mechanisms in hippocampus, perirhinal and entorhinal cortex are gradually malfunctioning upon long-term daily exposure, a phenotype that persists for at least 2 weeks after interruption of radiation, returning to normal memory performance levels 4 weeks later 
RFR may impair spatial memory and blood brain barrier permeability Tang, Jun, et al. “Exposure to 900MHz electromagnetic fields activates the mkp-1/ERK pathway and causes blood-brain barrier damage and cognitive impairment in rats.”  2015 Results demonstrate that exposure to 900 MHz EMF radiation for 28 days can significantly impair spatial memory and damage blood brain barrier permeability in rats by activating the mkp-1/ERK pathway. 
RFR could play a role in autism spectrum behavioursHerbert, Martha R., and Cindy Sage. “Autism and EMF? Plausibility of a pathophysiological link part II.”  2013Authors document how behaviours in autism spectrum conditions may emerge from alterations of electrophysiological oscillatory synchronization, how EMF/RFR could contribute to these by de-tuning the organism, and policy implications of these vulnerabilities.