Related Experiment Video
Updated: May 29, 2026
07:26
Assessment of Stress Effects on Cognitive Flexibility using an Operant Strategy Shifting Paradigm
Published on: May 4, 2020
Interactions of visual and cognitive stress
Niru K Nahar1, Sowjanya Gowrisankaran, John R Hayes
1The Ohio State University, College of Optometry, Columbus, USA. Nahar.2@osu.edu
Optometry (St. Louis, Mo.)
|September 3, 2011
Summary
Reading with induced refractive errors increases eye muscle activity and reduces eyelid aperture. This visual stress response appears localized, distinct from cognitive load effects.
Area of Science:
- Ophthalmology
- Neuroscience
- Ergonomics
Background:
- Assessing ocular and muscular responses during prolonged reading is crucial.
- Understanding the impact of visual and cognitive difficulty on reading performance is essential.
Purpose of the Study:
- To evaluate the ocular and muscular responses to extended reading sessions.
- To investigate how varying visual and cognitive difficulty levels affect reading.
Main Methods:
- Thirty-five subjects with normal vision read under six different visual and cognitive conditions.
- Surface electromyography (EMG) measured muscle activity (orbicularis oculi, frontalis, trapezius).
- Eye-tracking recorded aperture size, pupil diameter, and pulse rate.
Main Results:
- Induced refractive errors significantly increased orbicularis oculi EMG activity and reduced aperture size (P < 0.001).
- No significant differences in pulse rate, pupil diameter, or frontalis/trapezius EMG were observed under visual or cognitive stress.
- This suggests a localized mechanism for visual stress from refractive error.
Conclusions:
- Visual stress from induced refractive errors may involve a distinct local mechanism.
- This mechanism differs from those associated with low contrast or high cognitive demand reading.
- Findings highlight the specific impact of visual challenges on ocular muscle responses.
Related Concept Videos
01:20Psychological Responses to Stress
Psychological responses to stress encompass the various cognitive and emotional reactions individuals experience when faced with challenging or threatening situations, such as a job loss. Prolonged exposure to stressors can disturb emotional balance, increasing negative emotions (e.g., anxiety and sadness) and diminishing positive emotions (e.g., joy and satisfaction). These persistent emotional shifts are associated with an increased risk of both physical illness and mental health issues, such...
01:23Components of Stress
Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and opposite to those on the...
Interestingly, the hidden cube faces also experience these stresses, equal and opposite to those on the...
01:23Types of Stressors
A stressor is any event, condition, or stimulus that triggers stress and causes a physical or psychological response in the body. Stressors can be categorized into three main types: catastrophes; significant life changes; and daily hassles, including social stress. Each can be detrimental to physical and mental well-being.
Catastrophes
Catastrophes refer to large-scale, unpredictable events that create overwhelming stress and a sense of threat. Examples include natural disasters like...
Catastrophes
Catastrophes refer to large-scale, unpredictable events that create overwhelming stress and a sense of threat. Examples include natural disasters like...
01:24Physiological Foundation of Stress
Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...
Role of the Sympathetic Nervous System
Adrenaline triggers the...
01:30Stress and Mental Health
Chronic stress profoundly affects mental health, significantly influencing mood, behavior, and overall quality of life. Research closely links chronic stress with mental health conditions such as depression, anxiety, and substance use disorders. Ongoing exposure to stress can lead to physiological and psychological changes, initiating a cycle of emotional distress and maladaptive coping mechanisms.
Individuals with depression often experience challenges in both their personal and professional...
Individuals with depression often experience challenges in both their personal and professional...
01:27Introduction to Stress and Lifestyle
Stress is a multifaceted response to events perceived as challenging or threatening, highlighting physical, emotional, cognitive, and behavioral reactions. Physically, stress can lead to fatigue, sleep disruptions, and various health issues such as frequent colds, chest pains, and nausea. Emotionally, it can manifest as anxiety, depression, irritability, and anger triggered by both minor and major life events. Cognitively, it may result in difficulty in concentration, memory, and...