Symptoms of major depression in mentally retarded adults.

Meins (1995) looked at 32 adults with intellectual disability. The team asked what depression looks like in this group. They wrote down every sign, even the small ones. No treatment was given; it was a picture-taking study.

Adults with severe ID showed more anger, pacing, and behavior flare-ups when depressed. Adults with mild ID showed more classic signs like sad face and slow speech. The worse the ID, the less the depression looked “textbook.”

Sturmey et al. (2010) later tried to repeat the idea that behavior outbursts equal depression. They found no link; they say do not treat hitting or yelling as mood clues. This seems like a clash, but the two studies asked different questions. Meins (1995) only described what staff saw; Sturmey et al. (2010) tested if those behaviors predict a true depression diagnosis.

Perez et al. (2015) tracked the same adults for six months. They found that when interest in toys or songs dropped, self-injury rose later. This adds a time lens to W’s snapshot: low pleasure may come first, then the behavior storm.

Vos et al. (2013) showed we can tell mood from emotion in severe ID by counting smiles during favorite activities. Their data give us a cheap ruler: fewer smiles equals lower mood, backing up W’s call to watch for “atypical” signs.

If you support adults with severe ID, do not wait for “I feel sad.” Watch for new pacing, irritability, or sudden behavior spikes. Track how often they smile at preferred items each week; a drop can flag mood slide before injury starts. Pair your data with a doctor visit instead of assuming the behavior is just “attention-seeking.”