Is it true that Stress is always negative.?

Acute stress can be adaptive, triggering the fight-flight-freeze response to prepare the body for rapid action against a perceived threat.

Is it true that All learning involves conscious effort.?

Learning can occur through classical conditioning (involuntary association) and operant conditioning (consequences of voluntary behavior), as well as observational learning.

Is it true that Memory is like a perfect recording.?

Memory involves reconstruction, where stored information is combined with other available data, potentially leading to inaccuracies.

Nervous System, Stress, Learning, Memory & Sleep Cheat Sheet

Understanding the nervous system's structure and function, the impact of stress, and how we learn, remember, and sleep is crucial for comprehending how experiences shape behavior and mental wellbeing.

Core Principles

Nervous System Organization: The Central Nervous System (CNS) processes information, while the Peripheral Nervous System (PNS) transmits messages. The Autonomic Nervous System (ANS) regulates unconscious functions, with the Sympathetic (arousal) and Parasympathetic (calming) branches.
Synaptic Transmission: Neurons communicate via neurotransmitters released into the synaptic gap, influencing the likelihood of the next neuron firing.
Neurotransmitters & Neuromodulators: Glutamate and GABA are key neurotransmitters for excitation and inhibition, respectively. Dopamine and Serotonin act as both neurotransmitters and neuromodulators, influencing mood, reward, and more.
Synaptic Plasticity: Learning involves strengthening (LTP) or weakening (LTD) synaptic connections through processes like sprouting, rerouting, and pruning.
Stress Response: Acute stress triggers the fight-flight-freeze response via the Sympathetic NS. Chronic stress involves prolonged cortisol release, impacting health.
Learning Theories: Classical conditioning involves involuntary associations, operant conditioning links voluntary behavior to consequences, and observational learning occurs through modeling.
Memory Processes: Information moves through sensory memory, short-term memory (STM), and long-term memory (LTM) via encoding, storage, and retrieval.
Sleep Stages: Sleep cycles through NREM (N1, N2, N3) and REM stages, each with distinct brain activity and physiological characteristics.
Circadian & Ultradian Rhythms: Circadian rhythms (~24 hours) and ultradian rhythms (<24 hours, like sleep cycles) regulate biological processes.
Mental Wellbeing Continuum: Mental wellbeing exists on a continuum from high functioning to mental disorder, influenced by biological, psychological, social, and cultural factors.
Specific Phobias: These involve persistent, irrational fears often precipitated by classical conditioning and perpetuated by operant conditioning and cognitive biases.

Action Steps

1. Identify stressors: Distinguish between acute (short-term, adaptive) and chronic (long-term, detrimental) stressors to manage their impact.
2. Practice coping flexibility: Recognize when a coping strategy is inappropriate and switch to a more effective one for the specific situation.
3. Strengthen neural pathways for learning: Engage in repeated activation of neural pathways through practice and study to promote Long-Term Potentiation (LTP).
4. Improve sleep hygiene: Maintain a consistent sleep schedule, expose yourself to daylight, reduce blue light exposure before bed, and ensure a cool sleep environment (19-21°C).
5. Address phobias with evidence-based interventions: Utilize Cognitive Behavioural Therapy (CBT), systematic desensitisation, or GABA agonists under professional guidance.
6. Foster resilience: Cultivate psychological protective factors like mindfulness and social support to better cope with adversity.
7. Understand the Gut-Brain Axis: Recognize that stress can alter gut microbiota, influencing neurotransmitter production and psychological processes.

Key Terms

Synaptic plasticity: Specific changes occurring at synapses between neurons, fundamental for learning and memory.
LTP (Long-Term Potentiation): A relatively permanent strengthening of synaptic connections resulting from repeated activation of a neural pathway.
LTD (Long-Term Depression): A relatively permanent weakening of synaptic connections resulting from repeated low-level activation.
Stressor: An event that causes stress or is perceived as a threat or challenge to one's coping ability.
GAS (General Adaptation Syndrome): Selye's biological model describing the body's predictable three-stage response to prolonged stress: Alarm, Resistance, and Exhaustion.
Transactional Model of Stress: Lazarus and Folkman's psychological model where stress depends on an individual's appraisal of an event and their available coping resources.
Encoding: The process by which information enters memory.
Storage: The process of retaining information over time.
Retrieval: The process of recovering stored information.
Circadian rhythm: A biological rhythm that approximates a 24-hour cycle, influenced by light.
Resilience: The ability to recover from adversity and effectively cope with change and uncertainty.
Specific phobia: A persistent, intense, and irrational fear of a specific object or event.
Systematic desensitisation: A psychological treatment involving gradual exposure to a phobic stimulus while employing relaxation techniques.

Pro Tips

Use Glutamate to 'GO' for learning and memory formation by repeatedly activating neural pathways, and GABA to 'BRAKE' excessive neural activity and anxiety.
Recognize that 17 hours awake can impair performance similarly to a Blood Alcohol Concentration (BAC) of 0.05%, and 24 hours awake to 0.10%.
Understand that the Autonomic Nervous System (ANS) has two key branches: the Sympathetic (arousal) and Parasympathetic (calming), which work in opposition.
Remember that Long-Term Potentiation (LTP) strengthens synaptic connections through repeated activation, crucial for learning and memory.
Consider that Aboriginal and Torres Strait Islander learning is deeply embedded in relationships, Country, and a multimodal system of knowledge, emphasizing connection.

Pitfalls to Avoid

Chronic stress: Prolonged cortisol release suppresses the immune system, depletes resources, and increases vulnerability to illness, fatigue, irritability, anxiety, and depression.
Avoidance strategies: While providing short-term relief, avoidance coping strategies can be less effective long-term if they prevent addressing the source of the stress.
Ignoring the Gut-Brain Axis: Stress-induced changes in gut microbiota can negatively impact neurotransmitter function and psychological processes.
Inadequate sleep: Partial sleep deprivation impairs emotional regulation, attention, decision-making, and problem-solving abilities.
Cognitive biases in phobias: Memory bias and catastrophic thinking can maintain phobic responses by distorting recall and exaggerating negative predictions.

Myth vs Reality

Stress is always negative.: Acute stress can be adaptive, triggering the fight-flight-freeze response to prepare the body for rapid action against a perceived threat.
All learning involves conscious effort.: Learning can occur through classical conditioning (involuntary association) and operant conditioning (consequences of voluntary behavior), as well as observational learning.
Memory is like a perfect recording.: Memory involves reconstruction, where stored information is combined with other available data, potentially leading to inaccuracies.

Real World Examples

Touching a hot stove.: This triggers a spinal reflex (fast, involuntary) to protect the body from harm, demonstrating a rapid, unconscious response.
A student studying intensely for an exam.: Repeated activation of neural pathways related to the subject matter can lead to Long-Term Potentiation (LTP), strengthening memory and aiding recall.
Experiencing a near-miss car accident.: The Sympathetic Nervous System activates the fight-flight-freeze response (increased heart rate, breathing, dilated pupils) to prepare for immediate action.
A child learning to ride a bike.: This involves observational learning (watching others), motor skill development (procedural memory), and reinforcement (praise for success).
Feeling anxious before a presentation.: This illustrates the psychological appraisal aspect of stress; the perceived threat (presentation) and appraisal of coping resources influence the level of stress experienced.
A person with a fear of spiders.: This specific phobia may have been precipitated by classical conditioning (a spider bite) and is perpetuated by operant conditioning (avoidance reducing anxiety).

Statistics

STM Capacity: 7 ± 2 items
STM Duration: 12–30 seconds
Performance impairment after 17 hours awake: Equivalent to BAC 0.05%
Performance impairment after 24 hours awake: Equivalent to BAC 0.10%
Ideal sleep room temperature: 19–21°C

Timeline

Before conditioning: Neutral Stimulus (NS) elicits no specific response; Unconditioned Stimulus (UCS) elicits Unconditioned Response (UCR).
During conditioning: Neutral Stimulus (NS) is repeatedly paired with the Unconditioned Stimulus (UCS), leading to the Unconditioned Response (UCR).
After conditioning: The previously Neutral Stimulus becomes the Conditioned Stimulus (CS), eliciting a Conditioned Response (CR).
Alarm Reaction (GAS Stage 1): Initial shock followed by countershock, where the fight-flight-freeze response occurs as resistance drops below normal then rises above.
Resistance (GAS Stage 2): The body maximizes resources to cope with a continuing stressor, maintaining elevated resistance with high cortisol levels.
Exhaustion (GAS Stage 3): Energy reserves are depleted, the immune system is impaired by prolonged cortisol, and resistance decreases, leading to vulnerability to illness.

People

Hans Selye: Proposed the General Adaptation Syndrome (GAS) model of stress.
Lazarus & Folkman: Developed the Transactional Model of Stress, emphasizing psychological appraisal.
Atkinson & Shiffrin: Proposed the Multi-Store Model of memory (Sensory, STM, LTM).