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Psychology 2e · Sensation and Perception

Introduction

CC BY 4.0 · OpenStax · approximately 10 min read

Learning objectives

View original figure (external; image not reproduced in this text edition)

Original figure description: A photograph shows a person playing a piano on the sidewalk near a busy intersection in a city.

If you were standing in the midst of this street scene, you would be absorbing and processing numerous pieces of sensory input. (credit: modification of work by Cory Zanker)

Imagine standing on a city street corner. You might be struck by movement everywhere as cars and people go about their business, by the sound of a street musician’s melody or a horn honking in the distance, by the smell of exhaust fumes or of food being sold by a nearby vendor, and by the sensation of hard pavement under your feet.

We rely on our sensory systems to provide important information about our surroundings. We use this information to successfully navigate and interact with our environment so that we can find nourishment, seek shelter, maintain social relationships, and avoid potentially dangerous situations.

This chapter will provide an overview of how sensory information is received and processed by the nervous system and how that affects our conscious experience of the world. We begin by learning the distinction between sensation and perception. Then we consider the physical properties of light and sound stimuli, along with an overview of the basic structure and function of the major sensory systems. The chapter will close with a discussion of a historically important theory of perception called Gestalt.

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← Other States of ConsciousnessSensation versus Perception →

Attribution. Psychology 2e, OpenStax, Rice University, and the contributing authors credited in the book. Licensed under Creative Commons Attribution 4.0 International. Source revision e061043bf2 of openstax/osbooks-psychology (2026-01-23). CC BY 4.0. Original source ↗. Text edition of a pinned CC BY 4.0 source revision of the OpenStax book, converted from CNXML by the EvidenceHelix importer. Original prose, learning objectives, tables, exercises, glossary and captions are preserved; images are not copied (figures link to the original source and keep their credits). No new content was added. Later revisions of this book can carry different licence terms and are not used.

In this chapter Contents

  • Introduction
  • Sensation versus Perception
  • Waves and Wavelengths
  • Vision
  • Hearing
  • The Other Senses
  • Gestalt Principles of Perception

Source

OpenStax source file ↗

Illustrated original ↗

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