A total of 127 adult patients who had sustained an impact of significant mechanical energy to their skulls during motor vehicle incidents were given thorough neuropsychological, cognitive and personality assessments between 0.5 years and 4 years after the event. Cross-sectional analysis indicated no statistically significant objective changes in patients as a function of yearly intervals. However there was strong evidence of significant deterioration of neuropsychological proficiency and efficiency between 0.3 to 1.0 years after the injury. A subset (n = 20) of patients who displayed moderately severe neuropsychological impairment when assessed about 1 year after the injury showed no statistically significant changes when reassessed about 1.5 years later (2.5 years after the brain trauma). These results challenge the traditional concept of “recovery” following a traumatic brain injury and indicate that insidious processes that adversely affect neurocognitive capacity may emerge 0.5 years after the trauma. Post-hoc analysis indicated that the occurrence of unconsciousness or its duration at the time of the injury minimally affected the magnitude of subsequent indices of neuropsychological impairment but influenced the incidence of electroencephalographic theta activity during the years following the injury.
 M. A. Persinger, “Neuropsychologica Principia Brevita: An Application to Traumatic (Acquired) Brain Injury,” Psychological Reports, Vol. 77, No. 3, 1995, pp. 707-724. doi:10.2466/pr0.1918.104.22.1687
 M. A. Persinger, “Personality Changes Following Brain Injury as a Grief Response to Loss of the Sense of Self: Phenomenological Themes and Indices of Local Lability and Neurocognitive Structuring as Psychoptherapy,” Psychological Reports, Vol. 72, No. 3, 1993, pp. 1059-1068. doi:10.2466/pr0.1993.72.3c.1059
 M. A. Persinger, “Clinical Neurological Indicators Are Only Moderately Correlated with Quantitative Neuropsychological Test Scores in Patients Who Display Mild-Moderate Brain Impairment Following Closed Head Injuries,” Perceptual and Motor Skills, Vol. 81, No. 3, 1995, pp. 1283-1292. doi:10.2466/pms.1995.81.3f.1283
 R. Schoenhuber and M. Gentilini, “Neuropsychological Assessment of Mild Head Injury,” In: H. S. Levin, H. M. Eisenberg and A. L. Benton, Eds., Mild Head Injury, Oxford University Press, New York, 1989, pp. 101-121.
 W. E. Lado and M. A. Persinger, “Mechanical Impacts to the Skulls of Rats Produce Specific Deficits in Maze Performance and Weight Loss: Evidence of Apoptosis of Cortical Neurons and Implications for Clinical Neuropsychology,” Perceptual and Motor Skills, Vol. 97, 2003, pp. 115-127.
 W. E. Lado and M. A. Persinger, “Increased Conditioned Immobility and Weight Loss in Rats Following Mechanical Impacts to the Skull that Do Not Produce Loss of Consciousness,” Central European Journal of Biology, Vol. 3, No. 4, 2008, pp. 322-430. doi:10.2478/s11535-008-0041-6
 W. E. Lado and M. A. Persinger, “Spatial Memory Deficits and Their Correlations with Clusters of Shrunken Neuronal Soma in the Cortices and Limbic System Following a “Mild” Mechanical Impact to the Dorsal Skull in Female Rats,” Journal of Behavioral and Brain Science, Vol. 2, 2012, pp. 333-342. doi:10.4236/jbbs.2012.23038
 M. A. Persinger and P. M. Richards, “Foot Agility and Toe Gnosis/Graphaesthesia as Potential Indicators of Integrity of the Medial Surface: Normative Data and Specific Pop pulations,” Perceptual and Motor Skills, Vol. 80, No. 3, 1995, pp. 1101-1024. doi:10.2466/pms.1922.214.171.1241
 A. Salmoni, P. M. Richards and M. A. Persinger, “Absence of Frontal Lobe Dysfunction Indicators in Healthy Elderly Subjects: Comparisons with Verified Frontal Lobe Damage,” Developmental Neuropsychology, Vol. 12, No. 2, 1996, pp. 201-206. doi:10.1080/87565649609540646
 R. J. Roberts, L. L.Gorman, G. P. Lee, M. E. Hines, E. D. Richardson, T. A. Riggle and N. R. Varney, “The Epileptic Spectrum Disorder,” Epilepsy Research, Vol. 13, No. 2, 1992, pp. 167-177. doi:10.1016/0920-1211(92)90073-3
 R. J. Roberts, N. R. Varney, J. R. Hulbert, J. S. Paulsen, J. S. Richardson, J. A. Springer, J. S. Shepherd, C. M. Swan, J. A. Legrand, J. H. Harvey, M. A. Struchen and M. E. Hines, “The Neuropathology of Everyday Life: The Frequency of Partial Seizure Symptoms Among Normals,” Neuropsychology, Vol. 5, 1990, pp. 75-85.
 M. A. Persinger, “Discrepancies between Standardized Measures of Cognitive Level and Halstead-Reitan Impairment Indices as Inferences of Brain Damage Following Head Injuries,” Perceptual and Motor Skills, Vol. 89, No. 3, 1999, pp. 1210-1216. doi:10.2466/pms.1999.88.3c.1210
 M. A. Persinger, “Sense of Presence and Suicidal Ideation Following Brain Injury: Indications of Right Hemispheric Intrusions from Neuropsychological Profiles,” Psychological Reports, Vol. 75, No. 3, 1995, pp. 1059-1070. doi:10.2466/pr0.19126.96.36.1999
 M. A. Persinger and K. Makarec, “Temporal Lobe Epileptic Signs as a Continuum from Normals to Complex Partial Epileptics: Normative Data and Special Populations,” Journal of Clinical Psychology, Vol. 40, No. 1, 1993, pp. 33-45. doi:10.1002/1097-4679(199301)49:1<33::AID-JCLP2270490106>3.0.CO;2-H
 G. F. Lafreniere, O. Peredery and M. A. Persinger, “Progressive Accumulation of Large Aggregates of Calcium Containing Polysaccharides and Basophilic Debris within Specific Thalamic Nuclei after Lithium/Pilocarpine-Induced Seizures,” Brain Research Bulletin, Vol. 28, No. 5, 1992, pp. 825-830. doi:10.1016/0361-9230(92)90268-3
 R. Gorham and M. A.Persinger, “Emergence of Complex Partial Epilepsy-Like Experiences Following Closed Head Injuries: Personality Variables and Neuropsychological Profiles,” Epilepsy and Behavior, Vol. 23, No. 2, 2012, pp. 152-158. doi:10.1016/j.yebeh.2011.11.010