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Stress inhibits psychomotor performance differently in simple and complex open field environments
Jamshid Faraji1, Nabiollah Soltanpour2, Seyed Yaghoob Jafari3
1Canadian Centre for Behavioural Neuroscience, University of Lethbridge, Lethbridge, AB, Canada; Golestan University of Medical Sciences, Faculty of Nursing & Midwifery, Gorgan, Islamic Republic of Iran.
Restraint stress in rats inhibits psychomotor activity and exploratory behavior, particularly in complex environments. These stress effects on behavior are environment-dependent, highlighting the need for complex arenas to detect them.
Area of Science:
- Neuroscience
- Behavioral Science
- Animal Behavior
Background:
- Stress significantly impacts psychomotor function and exploratory behaviors.
- Environmental complexity can modulate the expression of stress-induced behavioral changes.
- The hypothalamic-pituitary-adrenal (HPA) axis is a key mediator of the stress response.
Purpose of the Study:
- To investigate the effects of restraint stress on psychomotor and exploratory behavior in rats.
- To examine how environmental complexity influences stress-induced behavioral alterations.
- To assess the role of the HPA axis, indicated by corticosterone levels, in mediating these changes.
Main Methods:
- Rats were subjected to seven days of restraint stress or control conditions.
- Behavioral testing was conducted in three versions of the ziggurat task (ZT) varying in environmental complexity.
- Psychomotor activity (horizontal and vertical) and exploratory patterns were quantified.
- Circulating corticosterone (CORT) levels were measured pre- and post-stress.
Main Results:
- Stress led to reduced path length, decreased path speed, and increased stop duration in the complex ZT arena.
- Stressed rats exhibited significantly fewer vertical movements (climbing onto ziggurats).
- No significant stress-induced behavioral changes were observed in the simple open-field arena.
Conclusions:
- Restraint stress induces psychomotor inhibition and reduces novelty-seeking behavior in a manner dependent on environmental complexity.
- Complex, multi-featured environments are more effective in revealing the inhibitory effects of stress on rodent psychomotor capabilities.
- These findings underscore the importance of environmental context in understanding stress-related behavioral deficits.
