Increasing the happiness of individuals with profound multiple disabilities: replication and extension.

Fournier et al. (2004) worked with adults who have profound multiple disabilities. They compared three session types: usual day program, social interaction alone, and social interaction plus favorite items.

The team used a multielement design. Sessions rotated quickly so they could see which condition lifted happiness most.

Both extra social interaction and the combo of items plus interaction raised happiness scores. The combo edged slightly ahead.

Happiness was measured by smiling, laughing, and relaxed body cues. Observers who did not know the condition tallied these signs.

Lancioni et al. (2011) replicated the mood boost using microswitch technology instead of a human presenter. Their adults chose stimuli via switch and still smiled more, showing the effect holds across delivery modes.

Parsons et al. (2016) extended the idea by adding staff familiarization. When new aides first played a preferred game with clients, later happiness and cooperation rose even higher than social interaction alone.

Kamlowsky et al. (2025) tested autistic children and found that social interaction also pumps up reinforcer power. Their data warn that mixed-assessment probes can hide effective items, a nuance the 2004 study did not explore.

You can raise happiness today without new gear. Simply weave more brief chat, singing, or touch into sessions, or pair these with a client’s favorite object. Rotate both options to see which mix works best for each person. Track smiles or relaxed posture for a quick read. If you train new staff, let them share a fun activity first—Parsons shows this small step pays off in smoother teaching later.