A 38-year-old woman with Major Depressive Disorder presents with prominent psychomotor retardation, severe guilt, and anhedonia. Her mood is consistently low throughout the day and worsens in the early morning. She has lost 6 kg over 3 months. Another patient with MDD presents with leaden paralysis, increased appetite, and mood that brightens when her children visit. Which finding best distinguishes the first patient's depression from the second?