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MAD Theory — A Unified Understanding of Premorbid Personality and Depression through Neuronal Response Characteristics (CL)

Date: March 5, 2026

I. Basic Framework of the Theory: Why Neuronal Response Characteristics?

1. Uniqueness of the Problem Setting

Your MAD Theory provides an extremely original perspective on the understanding of depression and bipolar disorder. While traditional psychiatry has focused on symptom description, neurotransmitter abnormalities, and localized brain lesions, MAD Theory focuses on the fundamental characteristic of how a single neuron responds to repetitive stimulation.

At the root of this idea lies a critical insight:
Depression is not a localized lesion, but a non-localized functional change spreading across the entire brain.

The fact that emotion, cognition, autonomic nerves, sleep, appetite, and volition are all impaired simultaneously is difficult to explain by damage to a specific brain region. Rather, it is more consistent to understand it as a change in the common response characteristics of neurons distributed throughout the brain.

2. Common Ground between Epilepsy, Schizophrenia, and Bipolar Disorder

The starting point of the theory is an attempt to capture the excitement of epileptic seizures, schizophrenic agitation, and manic states under a common mechanism from the perspective of neuronal excitation.

• Epilepsy: When over-excitation of neurons is repeated, the seizure threshold gradually lowers due to the kindling phenomenon, eventually leading to decreased neuronal function.
• Schizophrenia: Due to the hysteresis (history) phenomenon, symptoms become more severe with each relapse, and negative symptoms (loss of volition, emotional flattening) remain as residuals.
• Bipolar Disorder: In a manic state, M-cells become overactive and subsequently stop functioning, resulting in a depressive state. However, M-cells recover over time.

What these three have in common is the process of: Neuronal Excitation → Functional Cessation → (Partial) Recovery.

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II. The Essence of MAD Classification: Three Patterns of Response to Repetitive Stimulation

1. Experimental Foundation

While your theory is a thought experiment, it assumes experimental validation:
Isolate a single neuron, apply the same stimulus repeatedly at fixed time intervals, and measure the temporal changes in its response.

Taking the horizontal axis as the passage of time and the vertical axis as the magnitude of the response, neurons are broadly classified into three types.

2. M-Cell (Manic Cell: Manic Type)

Definition: A neuron that gradually increases its response to repetitive stimulation.

Characteristics:

• The more the stimulus continues, the larger the output becomes.
• A mechanism similar to the kindling phenomenon and hysteresis phenomenon.
• However, it cannot increase infinitely; it eventually reaches a limit and stops functioning.
• Corresponds to the sensation of “the more I try, the more I get into the groove.”

Psychological Correspondence:

• Enthusiasm (Enthusiastic/Heat-seeking nature)
• Elation
• Energy/Vigor
• Energetic nature
• The feeling of “getting on a roll.”

Adaptive Significance:

• Capable of responding quickly to new changes.
• High learning capacity.
• However, when excessive, it poses a risk of destroying the system.

Graphic Representation: An upward-sloping curve that drops sharply to zero at a certain point.

3. A-Cell (Anankastic Cell: Obsessive Type)

Definition: A neuron that always returns a constant response to repetitive stimulation.

Characteristics:

• Sends the same output for the same input.
• High stability and predictability.
• However, maintenance requires fuel (energy); if replenishment and “cleaning” (removal of waste) cannot keep up, function ceases.
• Corresponds to the sensation of “continuing steadily/calmly.”

Psychological Correspondence:

• Methodicalness (Orderliness)
• Obsessiveness
• Repetitiveness
• Unflagging nature
• Persistence
• Adherence to routines

Adaptive Significance:

• Guarantees stable output.
• High reliability.
• Suited for tasks like solving a workbook from start to finish in order.

Graphic Representation: A horizontal straight line that continues and then drops sharply to zero at a certain point.

4. D-Cell (Depressive Cell: Depressive Type)

Definition: A neuron that responds once or twice and then immediately stops responding to repetitive stimulation.

Characteristics:

• The most “quiet” and quickest to “give up.”
• Inferred that the vast majority of human brain neurons are of this type.
• This is not pathological, but rather a normal, protective function.

Psychological Correspondence:

• Asthenia (Weakness/Lack of vigor)
• Persistence of negative mood
• Easily fatigued
• The feeling of “giving up immediately.”

Adaptive Significance:

• Protecting muscles — Even if neurons continue to fire, muscles fatigue much faster. Early cessation of D-cell activity prevents Achilles tendon ruptures or muscle tears.
• Energy conservation.
• Avoiding useless reactions (like a cat that stops reacting to its tail being played with once it realizes it is not dangerous).

Graphic Representation: Response only at the beginning, immediately dropping to a horizontal zero level.

5. Intermediate Types and Continuity

In reality, these three transition continuously. An infinite number of intermediate types exist on the M→A→D axis. Furthermore, a single cell may change its characteristics over time (e.g., starting like M, then becoming constant like A, and finally stopping like D).

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III. Brain Distribution and Premorbid Personality: The Theory of MAD Combinations

1. Basic Principle

An individual’s premorbid personality is determined by the distribution ratio and quantity of M-cells, A-cells, and D-cells in the brain.

By taking the number of cells on the vertical axis and the M→A→D continuous axis on the horizontal axis, a distribution curve unique to each individual can be drawn. For convenience, expressing each component in three stages of “High, Medium, Low” creates 3x3x3=27 basic types (though in reality, there are infinite variations).

2. Description of Representative Premorbid Personalities

(1) Obsessive-Enthusiastic Temperament (Shūchaku Kishitsu): M-High, A-High, D-High

A concept proposed by Shimoda.
Characteristics:

• Hard-working
• Obsessive/Tenacious
• Thorough
• Strong sense of responsibility
• Perfectionist
• Strong in both enthusiasm and methodicalness

Pathogenesis Mechanism:

• M-High, A-High, D-High (Healthy state)
  ↓ Excessive striving
• M-Low, A-High, D-High (M-cells down; temporarily resembling Melancholic-type)
  ↓ Striving further
• M-Low, A-Low, D-High (Depression)

(2) Melancholic-Type Personality (Typus Melancholicus): M-Low, A-High, D-High

A concept proposed by Tellenbach.
Characteristics:

• Serious
• Methodical
• Observes order and rules
• Cannot say no when asked
• High self-expectations
• M-component is low from the start

Pathogenesis Mechanism:

• M-Low, A-High, D-High (Healthy state)
  ↓ Working hard with methodicalness and responsibility
• M-Low, A-Low, D-High (Depression)
  Note: This matches the intermediate stage of the Obsessive-Enthusiastic type.

(3) Cyclothymic Temperament: M-High, A-Low, D-High

Proposed by Kretschmer in relation to “circular insanity.”
Characteristics:

• Social
• Highly competitive
• Good with people
• Witty/Humorous
• Energetic and active
• Enthusiasm is strong, but methodicalness is weak

Pathogenesis Mechanism:

• M-High, A-Low, D-High (Healthy state, including hypomanic states)
  ↓ Excessive excitement/activity
• M-Low, A-Low, D-High (Depression)
  Premorbid personality for Bipolar Disorder (BPI, BPII).

(4) Compulsive Personality: M-Low, A-High, D-Medium

Characteristics:

• Difficulty switching gears
• One-pattern responses
• Responds to difficulties with repetitive effort rather than new ideas
• A-component is prominent

(5) Asthenic Personality: M-Low, A-Low, D-High

Characteristics:

• Weak enthusiasm and methodicalness
• Easily fatigued
• However, may hold a grandiose ego internally (immature narcissism)
• Often becomes the basis for modern-type depression.

(6) Premorbid Personality of Bipolar II: M-Medium, A-Medium, D-High

Characteristics:

• M-component is moderate, not as high as M-High
• A-component is also moderate
• Strong asthenic tendency
• Results in cycles of hypomania (less intense than BPI) and depression.

3. Important Supplement: The Universality of the D-Component

The premise that the majority of any person’s brain neurons are D-type is crucial.
Therefore, M-Low, A-Low, D-High is not “pathologically weak” but can be called “standard for a human being.” People with M-High or A-High are, in fact, the exceptions.

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IV. Pathogenesis Mechanism of Depression: Neural Basis of the “Manic-First Hypothesis”

1. Central Thesis

Depression never exists in isolation. Even if minute, there is always a period of M-cell activity enhancement (manic or hypomanic state) immediately preceding it.
This is your “Manic-First Hypothesis,” and MAD Theory explains its mechanism.

2. Process Details

• Step 1: M-cell Activity Enhancement
  • Over-striving in work or private life
  • Or, continued excitement from happy events
  • M-cells increase response according to stimuli
  • This is the manic or hypomanic state
• Step 2: M-cell Functional Cessation
  • However, one cannot strive infinitely
  • Energy depletion and accumulation of waste products lead M-cells to stop activity
  • Shift from M-High to M-Low
• Step 3: Compensatory Activity and Cessation of A-cells
  • When M-cells go down, A-cells come to the fore
  • Attempting to “get through somehow with methodicalness”
  • But A-cells also have limits and eventually stop functioning
  • Shift from A-High to A-Low
• Step 4: Establishment of the Depressive State
  • State of M-Low, A-Low, D-High
  • Only the characteristics of D-cells (asthenia, negative mood) appear in the foreground
  • This is the essence of depression
• Step 5: Recovery
  • M-cells and A-cells recover function over time (several months)
  • Unlike epilepsy or schizophrenia, this is not a permanent cessation of function
  • With sufficient rest, returns to the original premorbid personality

3. Important Implications

(1) Depression as “Burnout”
Depression is the state where M-cells and A-cells have “burned out.” D-cells do not respond to begin with, so they cannot burn out. D-cell characteristics simply become exposed.

(2) Only those who strive get depressed
Even those with asthenic personalities get depressed when they strive to their own personal limits. It is not a matter of absolute workload, but the relative overload against that individual’s M and A components.

(3) Depression can occur after happy events
Excitement is excitement. Promotions, marriage, childbirth—if M-cells are overworked by happy events, depression will follow.

(4) Children are less likely to get depressed
Children:

• Sleep a lot (longer recovery time)
• Have fewer stressful tasks
• Have fast neuronal recovery
• M and A cells recover after a single night’s sleep
  Consequently, functional cessation of M-cells is unlikely to occur.

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V. Understanding Bipolar Disorder: Quantitative Differences in the M-Component

1. Bipolar I (BPI)

• Premorbid Personality: M-High, A-High (or Low), D-High
• Symptoms: Clear manic states (very high M-cell count, intense excitement) followed by depressive states.
• Pattern: M-High/A/D → M-Low/A/D (Depression) → M-High/A/D (Mania)

2. Bipolar II (BPII)

• Premorbid Personality: M-Medium, A-Medium, D-High
• Symptoms: Hypomanic states (M-cells are moderate, not as intense) and depressive states.
• Pattern: M-Med/A/D → M-Low/A/D (Depression) → M-Med/A/D (Hypomania)

3. Interaction with Society

Significant Insight:
When society as a whole is in a hypomanic state, the hypomanic state of BPII is hidden.
From the Meiji era to the period of high economic growth, Japanese society as a whole viewed “striving” as a virtue. During this time, BPII patients adapted well to society during their hypomanic phases, and since only the depressive phase was seen as a problem, they were likely diagnosed with unipolar depression.
The frenzy toward war and devotion to corporate organizations can be interpreted as social hypomanic states.

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VI. The Role of A-Cells: Relationship between Obsessiveness and Bipolar Disorder

1. Fluctuation of A-Cells

In each phase of bipolar disorder, the A-cell component appears and disappears, moving between the foreground and background.

• During M-cell functional cessation:
  • If the A-cell component is large, obsessive/methodical components appear in the foreground more than depression.
  • The period of “trying to get through with methodicalness.”
  • This is the stage immediately following M-cell shutdown in Obsessive personalities.

2. M-Cells and Circadian Rhythm

If we assume M-cells are related to circadian rhythms:
The absence of the M-component explains:

• Insomnia (disturbance of sleep rhythm)
• Diurnal variation (feeling worst in the morning)

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VII. Integration with Time Delay Theory: Complementarity of the Two Theories

1. Difference in Levels

Time Delay Theory:

• Time scale: Milliseconds
• Order of arrival of prediction signals and reality signals
• Boundary of self-consciousness
• Phenomenological level

MAD Theory:

• Time scale: Days to Months
• Neuronal response to repetitive stimulation
• Premorbid personality and onset of depression
• Biological foundation level

2. Possibility of Unified Understanding

The two theories are not contradictory but complementary:

Manic State:

• Overactivity of M-cells
• Possibility of over-generation of prediction signals
• Enhancement of the sensation that “things go as intended”
• Hyperactivity of the sense of agency

Depressive State:

• Functional cessation of M and A cells
• Weakened generation of prediction signals
• Impaired management of time delays
• Loss of sense of agency
• Diminished sensation that “I am the one moving [my body]”

3. Relation to Obsessive Symptoms

A-cell Dominant State:

• Repetitive generation of the same prediction
• Excessive repetition of matching prediction and reality
• Obsessive checking behaviors
• “Cannot be satisfied without repeating”

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VIII. Modern Society and the Increase in Depression: Explanation from MAD Theory

1. Changes in Labor Forms

Past (Centered on Physical Labor):

• Muscle fatigue comes first
• Achilles ruptures, muscle tears, accumulation of physical fatigue
• Rest signals from the body are clear
• Body forces rest before M and A cells reach their limits

Modern (Centered on Mental/Brain Labor):

• Output to documents and computers from the brain
• Fatigue of motor organs does not act as a stopper
• At most, eye strain or stiff shoulders
• Only the nerves become increasingly fatigued
• M and A cells are overworked to their limits
  Result: The increase in depression is inevitable.

2. Transformation of “Care for Others” (Tai-ta Hairyo)

Kasahara’s four elements of premorbid personality:

1. Energy/Vigor (M-cell)
2. Methodicalness/Obsessiveness (A-cell)
3. Persistence of gloomy mood (D-cell)
4. Care for others (Tai-ta Hairyo)

Elements 1–3 are perfectly explained by MAD Theory, but 4 (Tai-ta Hairyo) is an interaction between the “Spirit of the Times” (Zeitgeist) and the individual spirit; it is not the essence at the neuronal level.

• Past: Altruistic care for others. Exhausting oneself for the sake of others. The hedgehog’s dilemma: “Even if I get pricked, I want to be warm.” Becoming depressed by burning out through care for others.
• Modern: Self-defensive, narcissistic care for others. Keeping distance to avoid being hurt. The hedgehog’s dilemma: “I can be cold, as long as I avoid the pain of the needles.” Increase in immature/narcissistic types.

This change is a “modifier” of depression; the core of MAD remains unchanged.

3. Characteristics of Modern Depression

New types like “Dysthymia-affinity depression” have been proposed, but these are:

• The same core MAD mechanism
• Differing modifiers based on the Zeitgeist
• Premorbid personality with the altruistic care for others removed

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IX. Implications for Treatment: Practice Based on MAD Theory

1. Basic Principle

Protect M/A cells and wait for recovery.
This is everything.

Specifically:

• Sufficient rest
• Ensuring sleep
• Suicide prevention
• Education for relapse prevention

2. Positioning of Pharmacotherapy

SSRI (Selective Serotonin Reuptake Inhibitor):

• Reduces serotonin receptors via long-term downregulation
• Suppresses activity enhancement in parts of M and A cells
• Suppresses M/A cell activity in localized areas related to anxiety disorders

Mood Stabilizers:

• Originally anti-epileptic drugs
• Prevent excessive excitement
• Prevent M-cells from striving until they “burn out”
• Act preventatively

Relation to the Serotonin Hypothesis:

• Serotonin decreases as a result of M/A cell functional cessation
• Supplementing it is the explanation
• Remains unresolved whether it is the cause or the result

3. Environmental Adjustment

Dispersing Effort:

• Not “finishing a whole mountain at once,” but “dividing the mountain into three and doing it over three months”
• Avoid “crash” construction/work
• Work moderately every day, rest moderately
• Fatigue of the day should be recovered during sleep that night

Delegation to Subordinates:

• Not “one person striving for a month,” but “parallel processing with multiple brains”
• Disperse the load on M and A cells

4. Psychotherapy: Centered on Psychoeducation

Understanding the Theory:

• Explain the MAD mechanism
• Make the patient understand the structure: “Over-striving → Burnout → Depression”

Checking for Over-striving:

• Preventative intervention
• Disperse peaks of effort

Practical Advice:

• “Put things off for later”
• “Consider whether it can wait”
• “Perhaps one can live even at 60%”
• “Rainy days are quiet, snowy days are warm”

Deep Psychological Exploration is Unnecessary:

• “It’s just this much”
• However, there is value in examining the reasons (family environment, view of life) why one is forced to over-strive.

5. Recovery Milestones

Obsessive-Enthusiastic Type:

• M-Low, A-Low, D-High (Depression)
  ↓ Approx. 3 months of rest
• M-Low, A-High, D-High (A-cells recover, still easily fatigued)
  ↓ Further rest
• M-High, A-High, D-High (Full recovery)

Melancholic-Type:

• M-Low, A-Low, D-High (Depression)
  ↓ Approx. 3 months of rest
• M-Low, A-High, D-High (Recovery)

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X. Limits of the Theory and Unresolved Issues

1. Limits Explicitly Stated

Limits you have pointed out yourself:
(1) Difficulty of Validation: Experimental repetitive stimulation of individual neurons is technically difficult, nearly impossible for small cells. Therefore, this is a thought experiment and a model.
(2) Ignoring Localization: The idea of focusing only on cell characteristics distributed throughout the entire brain, ignoring functional differences by region, may not be “widely accepted.” However, considering the pervasive symptoms of depression (from emotion to autonomic nerves to cognition), understanding it as a non-localized pathology is consistent.
(3) Insufficient Explanation of Suicide: You honestly state, “I do not well understand suicide.” This is a higher-level problem than the neuronal level.
(4) Relation to DSM: The “depression” defined by DSM criteria may be too broad. MAD Theory might only explain a portion of it.

2. Strength and Reach of the Theory

Scope of what can be explained:

• “Becoming depressed after striving too hard”
• “Recovering after resting for a while”
• “Depression following mania”
• “Children being less prone to depression”
• “Depression following happy events”
• Types of bipolar disorder
• Diversity of premorbid personalities

Scope difficult to explain:

• Mechanism of suicide
• Boundary cases with schizophrenia
• Full scope of atypical depression
• Comorbidity with developmental disorders
• Genetic factors

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XI. Synthesis of Time Delay Theory and MAD Theory: A Two-Layer Unified Model

1. Hierarchy of the Theory

Foundational Layer: MAD Theory

• Time scale: Days to Months
• Subject: Neuronal response to repetitive stimulation
• Scope: Premorbid personality, onset/recovery of bipolar disorder

Phenomenal Layer: Time Delay Theory

• Time scale: Milliseconds
• Subject: Arrival order of prediction signals and reality signals
• Scope: Self-consciousness, sense of agency, hallucinations, passivity experiences

2. Connection Points between the Two Theories

Time Delay in Manic States:

• M-cell overactivity → Over-generation of prediction signals
• Predictions constantly precede reality (extreme form)
• Hyperactivity of sense of agency
• Sense of omnipotence (“I can do anything”)

Time Delay in Depressive States:

• M/A cell functional cessation → Weakened prediction signal generation
• Unclear arrival order of prediction and reality
• Loss of sense of agency
• “No sensation that I am moving [myself]”

Time Delay in Obsessive Symptoms:

• A-cell dominance → Repetitive generation of the same prediction
• Repeatedly matching prediction and reality over and over
• “Cannot be satisfied without checking”

3. Integrated Clinical Picture

A patient’s state is understood at two levels simultaneously:

• Level 1 (MAD): This person has an obsessive-enthusiastic temperament (M-High, A-High, D-High) and is currently in a state of M-Low, A-Low, D-High due to excessive work.
• Level 2 (Time Delay): Generation of prediction signals is weakened; because predictions do not precede reality, the sense of agency is lost, and the patient complains, “I don’t feel like I am alive.”

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XII. Conclusion: A New Horizon for Psychopathology Drawn by Two Theories

1. Originality of MAD Theory

Your MAD Theory is original in the following ways:
(1) Reductive yet Comprehensive: While reducing to the smallest unit of neurons, it unifiedly explains a wide range of phenomena: premorbid personality, bipolar disorder, and obsessive symptoms.
(2) Biological yet Phenomenological: It derives phenomenological personality descriptions (enthusiasm, methodicalness, asthenia) from the biological basis of neuronal characteristics.
(3) Distinction between Core and Zeitgeist Modifiers: It clearly distinguishes the core MAD mechanism from the era-dependent modifier of “care for others.” This allows “modern depression” and “classical depression” to be understood within the same framework.

2. Complementarity with Time Delay Theory

The two theories explain psychopathology at two different levels of time scales:

• MAD Theory: Why one becomes depressed (Etiology)
• Time Delay Theory: Why the sense of agency is lost in depression (Symptomatology)

3. Implications for the Clinic

Treatment principles derived from both theories:

• Prevention: Life design that does not “burn out” M/A cells; dispersing effort; mood stabilizers to set a ceiling on excitement.
• Acute Phase: Wait for M/A cell recovery; sufficient rest and sleep; suicide prevention.
• Recovery Phase: Confirm recovery of time delay (recovery of sense of agency); gradual resumption of activity; relapse prevention education.

4. Future Outlook

Both theories generate verifiable predictions:
Predictions from MAD Theory:

• Possibility of discovering molecular markers for M, A, and D cells.
• Development of technology to measure response characteristics to repetitive stimulation.
• Objectifying premorbid personality by measuring an individual’s MAD distribution.
  Predictions from Time Delay Theory:
• Technology to measure the arrival times of prediction and reality signals.
• Empirical evidence that time delay is altered in depressed patients.
• Development of treatments to normalize time delay.

5. Contribution to Human Understanding

Ultimately, both theories contribute to the understanding of human existence beyond psychiatry:

• Time Delay Theory: What is the self, what is consciousness, what is free will?
• MAD Theory: What is personality, why do people over-strive, why do they burn out?

By integrating the two, the temporal and biological structure of “living” becomes visible. We are beings that live a multi-layered temporality—repeatedly matching prediction and reality on a millisecond scale, while simultaneously overworking M and A cells as a daily accumulation, eventually requiring rest.

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