Note that this is quite incorrect, actually.
- Complete absence: "Indicates isolation and emotional unavailability" [1][4]. "Suggests withdrawal from social interactions and introspection" [6]. "Observed in patients with severe negative symptoms, indicating a lack of openness to others" [7]. "Strongly linked to social withdrawal and defensive behavior" [9]. "Symbolizes isolation or lack of openness" [10]. "Predictive of withdrawal" [11].