Related Experiment Video
Updated: Jul 4, 2026
04:14
Observational Fear as a Model of Affective Empathy in Mice
Published on: November 22, 2024
Expressing fear enhances sensory acquisition.
Joshua M Susskind1, Daniel H Lee, Andrée Cusi
1Department of Psychology, University of Toronto, 100 St. George Street, Toronto, Ontario M5S 3G3, Canada. josh@aclab.ca
Nature Neuroscience
|June 17, 2008
Summary
Facial expressions like fear may have evolved to improve sensory input, not just for social signaling. Posing a fear expression enhances vision and breathing, supporting its role in sensory regulation.
Area of Science:
- Psychology
- Neuroscience
- Evolutionary Biology
Background:
- Facial expressions may originate from sensory regulation mechanisms.
- Previous theories suggest facial expressions serve social communication.
Purpose of the Study:
- To investigate if facial expressions, specifically fear, are configured to enhance sensory acquisition.
- To explore the antagonistic relationship between fear and disgust expressions in sensory modulation.
Main Methods:
- Statistical modeling of facial expression appearance (fear vs. disgust).
- Subjective reporting of visual field size.
- Measurement of eye movement velocity during target localization.
- Assessment of nasal volume and air velocity during inspiration.
Main Results:
- Fear and disgust expressions exhibit opposite shape and surface reflectance features.
- Posing fear expressions led to a subjectively larger visual field and faster eye movements.
- Fear expressions increased nasal volume and air velocity during inspiration, unlike disgust expressions.
Conclusions:
- Facial expressions, like fear, may have evolved to alter the sensory interface with the environment.
- Fear expressions enhance sensory perception, while disgust expressions dampen it.
- Findings support Darwin's hypothesis on the adaptive, non-arbitrary origins of facial expressions.
Related Concept Videos
01:09Preparedness and Phobias
Human fear responses to certain stimuli, such as darkness, heights, deep water, and blood, can often arise despite the absence of direct negative experiences. This phenomenon is rooted in evolutionary psychology, which posits that humans have developed a predisposition to fear stimuli that historically posed significant survival threats. This predisposition, known as preparedness, suggests that early humans who developed a fear of potentially dangerous entities, such as venomous snakes and...
01:16Role of Amygdala in Memory
The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
One of the...
One of the...
01:24Facial Feedback Hypothesis
Charles Darwin proposed that facial expressions are an evolutionary adaptation for communication. He argued that these expressions are not influenced by culture but are universal across species. For example, a snarling expression with exposed teeth signals a threat in many animals, including humans. Darwin also suggested that displaying an emotion can intensify the feeling. Smiling, for example, could enhance one's sense of happiness. This idea laid the foundation for understanding the role of...
01:20Desensitization and Tachyphylaxis
Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
Several...
Several...
01:14Conditioned Taste Aversion
Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
A notable characteristic of conditioned taste aversion is that it often requires only a single exposure...
A notable characteristic of conditioned taste aversion is that it often requires only a single exposure...
01:15Functional Brain Systems: Limbic System
The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...