![]() An underactive amygdala can result in high-risk behavior, and inappropriate social behavior. Individuals with disorders along the NDD spectrum, including UNDD, have dysregulation in the amygdala, which results in inappropriate response to stimuli. the freeze response- can be conducive to survival. A threat to survival is often best dealt with urgently, which is the function of the amygdala- recognize threats, and prepare the body to engage, or withdraw, or sometimes, neuromuscular lock- e.g. The right frontal lobe is specifically involved with executive function- e.g., decision making- and inhibition, but processes information slowly relative to the amygdala. The amygdala acts much faster than the orbito-frontal cortex. If the sensory input is recognized as a threat by the amygdala, the fight/flight/freeze response of the parasympathetic nervous system begins to activate. If the sensory input is deemed non-threatening, we note it and attend to the next incoming sensory stimuli. Sensory input goes to the orbito-frontal cortex, and to the amygdala for processing on an ongoing basis. A sub-cortical structure regulates our response to potentially dangerous environmental stimuli. The amygdala is the brain structure most frequently implicated in NDD, which would include UNDD. The diagnosis can be assigned when the clinician decides not to specify the reason the diagnostic criteria are unmet, or if there is insufficient information available at the time of the evaluation to make a more specific diagnosis (American Psychiatric Association, 2013). The symptoms cause distress, and impair functioning in social, educational/occupational, or other major areas of functioning. ![]() ![]() Unspecified Neurodevelopmental Disorder (UNDD) is a DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, fifth edition), diagnosis assigned to individuals who are experiencing symptoms of a neurodevelopmental disorder, but do not meet the full diagnostic criteria for one of the Neurodevelopmental disorders. DSM-5 Category: Neurodevelopmental Disorder Introduction
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