In Lost, the DHARMA Initiative station used for psychological experiments was called the Pearl.
The Pearl is an underground DHARMA station discovered by Locke and Boone during the first season. Its main room contains observation equipment and workstations where occupants monitor activities in other stations, especially the Swan.
DHARMA’s official purpose for the Pearl was psychological research. The station’s orientation film describes the monitoring work as part of an experiment involving human behavior, while the apparent surveillance of the Swan creates uncertainty about whether the computer tasks there are genuinely necessary.
The Pearl is sometimes confused with the Swan because the survivors first learn about DHARMA’s station network through the Swan hatch. The Pearl’s distinctive function is observation and recording rather than the Swan’s electromagnetic containment work.