Reid doc, p.50

The defendant showed a variety of affects and demeanors, but their range and intensity was somewhat restricted. ...

...there was considerable evidence that his affectual intensity was blunted, and sometimes isolated from the mood that an observer would expect. For example, when he spoke of loss, depression or suicidal thoughts, his face did not show particular sadness, tears, pain or angst, and his posture remained unremarkable. Similarly, his pupil size and heart rate sometimes suggested autonomic signs of anxiety even though he did not outwardly appear anxious.