Based on the principles of evolutionary theory as they apply to behavior, analyze the most likely reason for the striking similarity between the 'fear grin' in chimpanzees and the human expression of fear described in the case study. What does this similarity suggest about the origin of this particular emotional expression?

Cross-Species Emotional Expression

- Certain expressions of emotions are universal among all people
- Do nonhuman animals show similar expressions of emotions?
- Argued that emotional expression originated in a common ancestor
- Behavioral phenomena, nonhuman primates have the same facial muscles that humans have

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- Darwin's perspective
- Redican's perspective
- Evolutionary psychology

Evolutionary viewpoint of emotions

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

- The tendency of individuals to show the same response pattern to particular situations throughout their life span

Individual Response Stereotypy

Distinct facial expressions in nonhuman primates:
- grimace (fear or surprise
- tense mouth (anger)
- play face (human laugh)

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