The following picture is an example of what phenomenon? 
Definitions:
Naturalistic Observation
A research method in which subjects are observed in their natural environment without any manipulation by the observer.
Placebo Effect
A psychological phenomenon where a fake treatment improves a person's condition simply because they believe the treatment will work.
Operational Definition
A carefully worded statement of the exact procedures (operations) used in a research study. For example, human intelligence may be operationally defined as what an intelligence test measures.
Room Lighting
The use of light sources to illuminate an indoor area, which can impact mood, productivity, and visual comfort.
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