Kallen, V.L.

anxiety children disorder cortisol attention anxiety disorder level stress score cortisol concentrations adolescent child study chapter concentration symptom group response threat anxiety disorders psychiatry sample difference association scale picture treatment attentional trial reactivity anxiety symptoms hr level baseline response times neutral-neutral trials cortisol levels effect analyses interview anxiety scale hpa-axi treatment success adolescent psychiatry attentional bias period hpa axis treatment responders stress reactivity control depression research result table adhd children probe responder test periods system adhd group hr levels process condition psych iat ry anxiety levels 2009 american academy pretreatment journal psychology attentional processes anxiety disorder group neutral-neutral parent skin conductance level activity kirschbaum c attention score dsm-iv signi participant attention scores