Specific causes of this<unk>  are unknown. The interaction of physical, psychological, and environmental factors is thought to contribute to the<unk> . In neuropsychological and neurobiological research, some studies show evidence that abnormally high testosterone levels and abnormalities in cognitive processes (visual-motor, linguistic, attentional, and memory) are thought to play a role in learning<unk>  cases. The impact of brain injuries in both children and adults can impair any of these cognitive processes. Other disabilities * Dyslexia * Reading disability * Expressive language<unk>  * Mathematics<unk>  * Developmental coordination<unk>  * Traumatic brain injury
Disorder of written expression
Communication apprehension
Compulsive talking
Global perceptions of autism
Body-focused repetitive behavior
Passive-aggressive behavior
Psychological resistance
Compulsive behavior