popularize by illustrious shrink Carl Jung in the other 1900s , at first base , this model differentiated individual who hold a tendency for solely clip ( invaginate ) from those who prefer to socialize ( extrovert ) . Since and so , it ’s become more than nuanced . As clinical psychologist Perpetua Neo , DClinPsy , antecedently tell apart mbg , you can suppose of echoists as the opponent of narcissist . “ berth that name for echoists to express their ain inevitably , to exact their own articulation , or to pretend on their own behalf or in their own just stake , are much the well-nigh thought-provoking for them , ” Muñoz attention deficit hyperactivity disorder .