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In psychology, concepts can be divided into two categories: natural and artificial. Natural concepts are formed through direct or indirect experiences. For example, consider the concept of snow. If you live in a place with regular snowfall, such as Essex Junction, Vermont, you know snow through direct experiences. You’ve seen it fall, touched it, shoveled it, and played in it. You recognize its texture, appearance, and even its smell. In contrast, if you live on an island like Saint...

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Related Experiment Video

Updated: Jan 31, 2026

An Experimental Approach to Investigating Effects of Artificial Light at Night on Free-Ranging Animals: Implementation, Results, and Directions for Future Research

An Experimental Approach to Investigating Effects of Artificial Light at Night on Free-Ranging Animals: Implementation, Results, and Directions for Future Research

Published on: February 2, 2022

Do We Use Artificial Light Appropriately?

Heon-Jeong Lee¹

¹Department of Psychiatry, Korea University College of Medicine, Seoul, Republic of Korea.

Psychiatry Investigation

|January 3, 2019

Summary

No abstract available in PubMed .

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