922 Arousal and Alertness

Overview

1. Arousal

Definition

Alertness is the capacity to sustain attention and respond appropriately to stimuli over time, built upon an adequate level of arousal.

👉 If arousal is “power supply”, alertness is “usable readiness and responsiveness.”

Core Characteristics

Reflects moment-to-moment attentional readiness
Includes speed, accuracy, and consistency of response
Can be:
- Tonic (baseline alertness)
- Phasic (stimulus-driven alertness)

Primary Neural Substrates

Reticular Activating System (RAS) – central regulator
Brainstem nuclei + thalamocortical projections
Diffuse cortical activation

Key Neurotransmitter Systems

Noradrenaline (Locus coeruleus) → vigilance, stress response
Acetylcholine → cortical activation
Dopamine → motivational arousal
Serotonin → modulation/stability
Histamine → wakefulness
GABA → inhibitory (reduces arousal)

Components of Arousal

1. Physiological Arousal

Heart rate, respiration, blood pressure
Skin conductance (sympathetic activity)

2. Cortical Arousal

EEG activation (low-amplitude, high-frequency waves)
Determines consciousness level

3. Autonomic Arousal

Sympathetic–parasympathetic balance

4. Emotional Arousal

Limbic activation (especially amygdala-driven)
Links arousal to affect (fear, excitement)

5. Behavioral Arousal

Motor readiness, restlessness, responsiveness

Operational Model of Arousal

Baseline Model

Input (internal/external stimuli)
        ↓
Brainstem RAS Activation
        ↓
Neurotransmitter Release (NE, ACh, DA, Histamine)
        ↓
Thalamic Relay → Cortical Activation
        ↓
Global CNS Activation Level (Arousal State)
        ↓
Modulation of Attention, Perception, Action

Functional Role

Determines whether cognition can occur at all
Sets the gain control for attention systems
Enables state transitions (sleep ↔ wake)

2. Alertness

Definition

Alertness is the capacity to sustain attention and respond appropriately to stimuli over time, built upon an adequate level of arousal.

👉 If arousal is “power supply”, alertness is “usable readiness and responsiveness.”

Core Characteristics

Reflects moment-to-moment attentional readiness
Includes speed, accuracy, and consistency of response
Can be:
- Tonic (baseline alertness)
- Phasic (stimulus-driven alertness)

Primary Neural Substrates

Fronto-parietal attention networks
Thalamus (relay + gating)
Brainstem (RAS input)

Components of Alertness

1. Tonic Alertness

Sustained readiness over time
Example: staying attentive during a lecture

2. Phasic Alertness

Rapid increase in responsiveness to a stimulus
Example: reacting to a sudden sound

3. Sustained Attention (Vigilance)

Maintaining alertness over prolonged periods

4. Response Readiness

Motor and cognitive preparedness to act

5. Processing Readiness

Speed of information processing

Operational Model of Alertness

Baseline Arousal Level
        ↓
Activation of Attention Networks (Frontal + Parietal)
        ↓
Stimulus Detection (Sensory Systems)
        ↓
Thalamic Filtering & Signal Prioritisation
        ↓
Cognitive Engagement (Attention Allocation)
        ↓
Motor / Cognitive Response Execution

3. Arousal vs Alertness — Key Distinction

Feature	Arousal	Alertness
Nature	Global CNS activation	Functional attentional readiness
Level	Physiological	Cognitive-behavioral
Control	Brainstem (RAS)	Cortico-thalamic networks
Function	Enables wakefulness	Enables effective response
Analogy	Engine running	Driver actively steering

4. Integrated Model (Arousal → Alertness → Attention)

5. Regulatory Dynamics: The Yerkes–Dodson Principle

Optimal performance occurs at moderate arousal
Too low → lethargy, inattention
Too high → anxiety, distractibility

This explains:

ADHD variability
Anxiety-related overactivation
Fatigue-related underperformance

6. Clinical Interpretation

Low Arousal

Drowsiness, fatigue
Seen in:
- Depression
- Sleep disorders
- Sedative effects

Hyperarousal

Anxiety, agitation, hypervigilance
Seen in:
- PTSD
- Anxiety disorders

Impaired Alertness

Slow reaction time
Poor sustained attention
Seen in:
- ADHD
- Delirium
- Brain injury

7. Practical Clinical Insight

Arousal is necessary but not sufficient for alertness
You can have:
- High arousal + poor alertness → anxiety, distractibility
- Adequate arousal + good alertness → optimal performance
- Low arousal → no meaningful cognition possible

8. Concise Summary

Arousal = global brain activation state (regulated by RAS)
Alertness = functional readiness to detect and respond
Arousal drives, alertness deploys, attention executes

Alertness vs Attention — Relationship and Critical Differences

This distinction is foundational in neurocognitive modelling. Many clinical errors arise from conflating the two.

Core Difference (In One Line)

Alertness is about readiness; Attention is about selection.

Definition

Alertness

Alertness = the state of readiness to respond to stimuli, dependent on baseline arousal.

“Am I ready?”
Governs response speed and consistency
Non-selective (does not choose what to focus on)

Attention

Attention = the selective allocation of cognitive resources to specific stimuli or tasks.

“What am I focusing on?”
Determines selection, prioritisation, and filtering
Content-specific

Neurocognitive Architecture

Alertness System

Brainstem (RAS)
Thalamus
Right frontal-parietal system (tonic alertness)

Attention System

Fronto-parietal networks
Executive control (prefrontal cortex)
Sensory cortices (modulated input)

Operational Relationship

Hierarchical Dependency Model

Arousal
↓
Alertness (Readiness)
↓
Attention (Selection)
↓
Cognitive Processing

Functional Components Compared

Domain	Alertness	Attention
Primary Function	Readiness to respond	Select what to process
Type	State	Process
Scope	Global	Selective
Control	Mostly bottom-up	Bottom-up + Top-down
Time Scale	Sustained baseline	Dynamic, task-dependent
Output	Reaction readiness	Focused processing

Clinical Dissociation (Key Insight)

1. Low Alertness → Impaired Attention

Drowsy patient cannot attend
Seen in:
- Delirium
- Sedation
- Sleep deprivation

2. Normal Alertness + Poor Attention

Fully awake but distracted
Seen in:
- ADHD
- Executive dysfunction

3. High Alertness + Poor Attention

Hyperaroused but unfocused
Seen in:
- Anxiety disorders
- PTSD

👉 This is a critical diagnostic pattern

4. High Alertness + High Attention

Optimal performance state
Goal-directed, focused

Mechanistic Flow (How They Interact)

External/Internal Stimulus
↓
Arousal System Activation
↓
Alertness Level Set (Readiness threshold)
↓
Attention System Engages
↓
Stimulus Selection (Relevant vs Irrelevant)
↓
Cognitive Processing & Response

8. Types: Where They Overlap and Diverge

Alertness Types

Tonic alertness (baseline readiness)
Phasic alertness (brief increase after stimulus)

Attention Types

Sustained attention
Selective attention
Divided attention
Executive attention

👉 Phasic alertness often triggers attention, but does not guarantee it.

10. Failure Modes (Very Practical)

Pattern	Interpretation
Slow + inaccurate	Low alertness
Fast + error-prone	High alertness, poor attention
Variable performance	Fluctuating alertness
Distractible but awake	Attention deficit

Integration into HNF Framework

Arousal → foundational physiological driver
Alertness → gateway state
Attention → active cognitive controller

👉 Attention is not possible without sufficient alertness, but alertness alone does not ensure attention

12. Concise Clinical Summary

Alertness = readiness to engage
Attention = ability to focus selectively
Alertness enables, attention executes

Arousal & Alertness — Impaired vs High-Performing States (Comparative Clinical Matrix)

This is where the model becomes clinically useful: both under-function and over-function states produce distinct, observable phenotypes with different diagnostic implications.

1. Arousal — Spectrum of Function

A. Impaired (Hypoarousal)

Core Phenotype

Reduced CNS activation → insufficient “energy” for cognition

Clinical Features

Drowsiness, lethargy
Slowed psychomotor responses
Reduced responsiveness to stimuli
Poor initiation of activity
Decreased emotional reactivity (flattening)

Functional Impact

Attention cannot be sustained
Processing speed markedly reduced
Executive functions collapse early

Typical Associations

Depression (low-energy subtype)
Sleep deprivation / disorders
Sedative medications
Hypothyroidism
Delirium (hypoactive type)

B. High-Performing / Optimal Arousal

Core Phenotype

Balanced CNS activation → optimal cognitive throughput

Clinical Features

Wakeful, calm, responsive
Stable energy levels
Good stress tolerance
Efficient sensory processing

Functional Impact

Enables sustained attention
Facilitates learning and memory
Supports executive control

👉 This is the “performance zone”

C. Hyperarousal (Over-function)

Core Phenotype

Excess CNS activation → noisy, unstable system

Clinical Features

Restlessness, agitation
Hypervigilance
Increased startle response
Autonomic overactivation (tachycardia, sweating)
Emotional intensity (anxiety, irritability)

Functional Impact

Attention becomes fragmented
Poor filtering → distractibility
Cognitive inefficiency despite “high energy”

Typical Associations

Anxiety disorders
PTSD
Mania / hypomania
Substance effects (e.g., stimulants)

2. Alertness — Spectrum of Function

A. Impaired Alertness

Core Phenotype

Reduced readiness to detect/respond despite possible wakefulness

Clinical Features

Slow reaction time
Missed stimuli
Fluctuating responsiveness
Reduced vigilance over time

Functional Impact

Poor sustained attention
Errors of omission (missed cues)
Inconsistent performance

Typical Associations

ADHD (especially inattentive type)
Delirium
Brain injury
Fatigue states

B. High-Performing Alertness

Core Phenotype

Efficient, stable readiness and responsiveness

Clinical Features

Quick but accurate responses
Consistent vigilance
Efficient detection of relevant stimuli
Low error rates

Functional Impact

Strong sustained attention
High task efficiency
Reliable performance under load

👉 This is the “cognitive readiness optimum”

C. Hyper-alertness (Over-function)

Core Phenotype

Excessive readiness → oversensitivity to stimuli

Clinical Features

Over-reactivity to minor stimuli
Jumpiness, scanning behaviour
Difficulty ignoring irrelevant inputs
Premature responses (impulsivity)

Functional Impact

Errors of commission (false positives)
Distractibility
Reduced precision despite speed

Typical Associations

Anxiety disorders
PTSD (hypervigilance)
ADHD (hyperactive/impulsive subtype)
Mania

3. Direct Comparison Table

Arousal vs Alertness Across Functional States

State	Arousal	Alertness
Impaired	Low energy, drowsy, unresponsive	Slow, inconsistent, misses stimuli
Optimal	Balanced activation, stable	Fast, accurate, sustained responsiveness
Over-function	Hyperactivated, anxious, agitated	Oversensitive, impulsive, error-prone

4. Cross-State Clinical Patterns (Critical Insight)

1. Low Arousal + Low Alertness

“Switched off system”
Seen in:
- Sedation
- Severe depression
- Hypoactive delirium

2. Normal Arousal + Low Alertness

Awake but inattentive
Seen in:
- ADHD (core phenotype)

3. High Arousal + High Alertness (Unstable)

Hypervigilant but inefficient
Seen in:
- Anxiety, PTSD

4. Optimal Arousal + Optimal Alertness

Peak cognitive performance
Stable, efficient, adaptive

5. Mechanistic Interpretation

Too Little Arousal → System Underpowered → Alertness fails
Optimal Arousal → Stable platform → Alertness optimal
Too Much Arousal → System noise ↑ → Alertness becomes unstable

👉 Alertness quality is directly modulated by arousal level

6. Error Pattern Differentiation (Clinically Useful)

Error Type	Likely Mechanism
Missed stimuli	Low alertness
Slow responses	Low arousal
Impulsive errors	Hyper-alertness
Distractibility	Hyperarousal + poor filtering

7. Integration into HNF Framework

Arousal = energy regulator
Alertness = readiness regulator
Both act as upstream modulators of:
- Attention
- Processing speed
- Executive function

8. Concise Clinical Takeaway

Both systems follow an inverted-U performance curve
Too little → underperformance
Too much → instability
Optimal middle → maximal efficiency

Domain × Disorder × Severity matrix (Clinically Oriented)

Introduction

This matrix integrates:

Two domains: Arousal and Alertness
Key neuropsychiatric / neurological disorders
Severity gradient: Mild → Moderate → Severe
With directionality: Hypo (↓), Hyper (↑), Dysregulated (↕)

1. Legend (Interpretation Framework)

Symbol	Meaning
↓	Hypofunction (reduced)
↑	Hyperfunction (excessive)
↕	Dysregulated / fluctuating
✓	Characteristic feature

The Matrix - A. AROUSAL DOMAIN

Disorder	Mild	Moderate	Severe
Attention Deficit Hyperactivity Disorder (ADHD)	↕ mild variability	↑ (hyperarousal episodes)	↕ marked dysregulation
Autism Spectrum Disorder (ASD)	↕ sensory-linked shifts	↑ or ↓ context-dependent	↕ extreme dysregulation
Pathological Demand Avoidance (PDA)	↑ situational	↑↑ (demand-triggered)	↕ extreme (shutdown ↔ panic)
Generalized Anxiety Disorder (GAD)	↑ baseline tension	↑↑ persistent hyperarousal	↑↑↑ autonomic overload
Major Depressive Disorder (Depression)	↓ low energy	↓↓ psychomotor slowing	↓↓↓ stupor-like states
Delirium	↕ fluctuating	↓ or ↑ alternating	↓↓↓ or ↑↑ (severe agitation/coma)
Traumatic Brain Injury (TBI)	↓ mild lethargy	↓↓ impaired wakefulness	↓↓↓ coma / severe impairment
Post-Traumatic Stress Disorder (PTSD)	↑ hypervigilance	↑↑ persistent	↑↑↑ extreme hyperarousal
Bipolar Disorder (mania phase)	↑ increased energy	↑↑ agitation	↑↑↑ extreme activation
Sedative drug effect	↓ mild sedation	↓↓ marked drowsiness	↓↓↓ unconsciousness

The Matrix - B. ALERTNESS DOMAIN

Disorder	Mild	Moderate	Severe
Attention Deficit Hyperactivity Disorder (ADHD)	↓ inconsistent alertness	↓↓ sustained attention failure	↓↓↓ severe vigilance deficit
Autism Spectrum Disorder (ASD)	↕ selective alertness	↓ context-dependent lapses	↕ severe inconsistency
Pathological Demand Avoidance (PDA)	↓ task-related	↓↓ avoidance-linked disengagement	↓↓↓ shutdown (non-response)
Generalized Anxiety Disorder (GAD)	↑ hyper-alertness	↑↑ scanning/distractibility	↑↑↑ inefficient vigilance
Major Depressive Disorder	↓ slowed responses	↓↓ poor vigilance	↓↓↓ minimal responsiveness
Delirium	↕ fluctuating	↓↓ impaired detection	↓↓↓ inability to sustain
Traumatic Brain Injury (TBI)	↓ slowed processing	↓↓ poor response readiness	↓↓↓ severe impairment
Post-Traumatic Stress Disorder (PTSD)	↑ hypervigilance	↑↑ exaggerated response	↑↑↑ scanning + errors
Bipolar Disorder (mania phase)	↑ rapid responses	↑↑ impulsive responding	↑↑↑ chaotic responsiveness
Fatigue / sleep deprivation	↓ reduced vigilance	↓↓ lapses (microsleeps)	↓↓↓ failure to respond

3. Cross-Domain Pattern Recognition (High Yield)

1. ADHD Prototype

Arousal: ↕ unstable
Alertness: ↓ impaired sustained
👉 Core issue: regulation failure

2. Anxiety / PTSD Prototype

Arousal: ↑↑ hyper
Alertness: ↑↑ hypervigilant but inefficient
👉 High energy + poor filtering

3. Depression Prototype

Arousal: ↓
Alertness: ↓
👉 Global underactivation

4. Delirium Prototype

Arousal: ↕ fluctuating
Alertness: ↓↓↓ severely impaired
👉 Key diagnostic hallmark

5. PDA / ASD Demand Shutdown

Arousal: ↑ → crash
Alertness: ↓↓↓ (shutdown)
👉 Dynamic state switching

4. Severity Gradient — Clinical Meaning

Severity	Interpretation
Mild	Subclinical / compensable
Moderate	Functional impairment present
Severe	Loss of adaptive functioning / safety risk

5. Operational Clinical Use

This matrix supports:

Differential diagnosis
Severity grading
Triage decisions (Red–Amber–Green)
CDSS rule-building

6. Compact Summary

Arousal abnormalities → energy dysregulation
Alertness abnormalities → response/readiness failure
Their interaction pattern defines disorder phenotype

Practical Clinical Questions (Detection + Quantification Tool)

Introduction

This is a clinician-ready question bank designed to:

Detect hypo-, optimal-, and hyper-states
Quantify severity (mild–moderate–severe)
Differentiate arousal vs alertness dysfunction

1. Scoring Framework (Use Across All Questions)

Score	Interpretation
0	Normal / optimal
1	Mild deviation
2	Moderate impairment
3	Severe impairment

👉 For hyperstates, scoring reflects excess severity, not impairment alone.

2. AROUSAL DOMAIN — Clinical Question Set

A. Hypoarousal (Low Arousal Detection)

Core Questions

Do you feel persistently tired or low in energy, even after adequate rest?
Do you struggle to stay awake during passive activities (reading, meetings)?
Do others notice that you appear slow, disengaged, or drowsy?
Do you take a long time to “get going” in the morning?
Do you feel your body and mind are slowed down?

Objective Probes

Time to respond to questions (clinician observation)
Psychomotor speed (e.g., finger tapping)

B. Hyperarousal (Overactivation Detection)

Core Questions

Do you feel constantly “on edge” or keyed up?
Are you easily startled by sounds or sudden events?
Do you experience racing thoughts or internal restlessness?
Do you have difficulty relaxing, even when safe?
Do you notice physical signs (palpitations, sweating, tension)?

Contextual Triggering

Are these symptoms worse in specific situations (demands, social settings)?

C. Arousal Stability (Dysregulation)

Core Questions

Does your energy level fluctuate significantly during the day?
Do you swing between very low energy and overactivation?
Are these shifts triggered or unpredictable?
Do you experience sudden shutdowns or crashes?

3. ALERTNESS DOMAIN — Clinical Question Set

A. Impaired Alertness (Hypo-alertness)

Core Questions

Do you miss things that others notice (e.g., instructions, cues)?
Do you feel slow to respond when spoken to?
Do you find it hard to stay alert during tasks over time?
Do you have “blank moments” or lapses in awareness?
Do you need frequent stimulation (movement, noise) to stay engaged?

B. Sustained Alertness (Vigilance)

Core Questions

Can you maintain attention during long tasks without drifting?
Do you make careless mistakes due to inattention over time?
Does your performance decline as time passes?

C. Hyper-alertness (Over-reactivity)

Core Questions

Do you feel overly sensitive to sounds, movements, or changes?
Do you react too quickly or impulsively before thinking?
Do you find it hard to ignore irrelevant stimuli?
Do you feel like you are constantly scanning your environment?

D. Response Readiness / Speed

Core Questions

Do you feel your reaction time is slower than others?
Or do you respond too quickly and make mistakes?
Do you feel your responses are inconsistent?

4. Cross-Domain Differentiation Questions (High Yield)

These help distinguish arousal, alertness, and attention.

A. Low Arousal vs Low Alertness

Do you feel sleepy/tired, or awake but mentally disengaged?
When stimulated (conversation/activity), do you improve quickly?
- Yes → low arousal
- No → alertness deficit

B. Hyperarousal vs Hyper-alertness

Do you feel physically tense/anxious (body-driven)? → arousal
Or mentally over-responsive to stimuli (processing-driven)? → alertness

C. ADHD Pattern Probe

Do you feel awake but unable to stay consistently engaged?
Do you need external stimulation to maintain focus?
Is your performance variable rather than consistently low?

D. Anxiety/PTSD Pattern Probe

Do you feel constantly on guard, even when safe?
Do you over-notice irrelevant details?
Do you feel unable to “switch off” your awareness?

E. Depression Pattern Probe

Do you feel both low energy and slowed responsiveness?
Do you find it hard to initiate and sustain activity?

5. Severity Quantification Algorithm

Step 1: Domain Scoring

Sum Arousal items → A-score
Sum Alertness items → L-score

Step 2: Severity Bands

Score Range	Severity
0–5	Normal
6–10	Mild
11–15	Moderate
>15	Severe

Step 3: Pattern Interpretation

Pattern	Likely Mechanism
High A + Low L	Anxiety / ADHD overlap
Low A + Low L	Depression / fatigue
High A + High L	Hypervigilance
Fluctuating both	Delirium / PDA / ASD dysregulation

6. Clinician Observation Checklist (Essential Add-on)

Arousal

Posture (slumped vs tense)
Eye opening / blinking
Motor activity (slowed vs restless)

Alertness

Response latency
Missed cues
Error patterns (omission vs commission)

7. Ultra-Compact Bedside Screen (30-second version)

Ask:

“Do you feel more tired or overactive most of the time?”
“Do you miss things or react too quickly?”
“Is your energy stable or fluctuating?”
“Can you stay alert during a task for 10–15 minutes?”

👉 This quickly triages into:

Hypoarousal
Hyperarousal
Alertness deficit
Dysregulation pattern

8. Clinical Takeaway

Arousal questions → energy state
Alertness questions → responsiveness quality
The pattern, not individual answers, drives diagnosis

NICE-aligned A4 clinician scoring tool

Patient Identification

Name: ___________________________
Age: __________ Sex: __________
Date: __________
Clinician: ________________________
Setting: ☐ OPD ☐ Ward ☐ Emergency ☐ Community

Instructions (Clinician Use)

Ask each question based on last 2 weeks (or current acute state if inpatient)
Tick one option per item
Score each item:
- 0 = Normal
- 1 = Mild deviation
- 2 = Moderate
- 3 = Severe

SECTION A — AROUSAL (Energy & Activation State)

A1. Hypoarousal (Low Energy / Underactivation)

Question	0	1	2	3
Feels persistently tired or low energy	☐	☐	☐	☐
Difficulty staying awake during passive tasks	☐	☐	☐	☐
Appears slowed or drowsy to others	☐	☐	☐	☐
Takes long to “get started” (morning inertia)	☐	☐	☐	☐
Reports slowed thinking or body	☐	☐	☐	☐

A2. Hyperarousal (Overactivation / Anxiety-like State)

Question	0	1	2	3
Feels constantly “on edge”	☐	☐	☐	☐
Easily startled by stimuli	☐	☐	☐	☐
Internal restlessness or racing thoughts	☐	☐	☐	☐
Difficulty relaxing even when safe	☐	☐	☐	☐
Physical signs (palpitations, sweating, tension)	☐	☐	☐	☐

A3. Arousal Stability (Regulation / Fluctuation)

Question	0	1	2	3
Energy fluctuates significantly during the day	☐	☐	☐	☐
Swings between low energy and overactivation	☐	☐	☐	☐
Sudden “crashes” or shutdown episodes	☐	☐	☐	☐

Arousal Subtotal (A-score): ______ / 39

SECTION B — ALERTNESS (Responsiveness & Vigilance)

B1. Impaired Alertness (Reduced Responsiveness)

Question	0	1	2	3
Misses cues or instructions	☐	☐	☐	☐
Slow to respond when spoken to	☐	☐	☐	☐
Difficulty staying alert over time	☐	☐	☐	☐
Experiences lapses / “blank moments”	☐	☐	☐	☐
Needs stimulation to stay engaged	☐	☐	☐	☐

B2. Sustained Alertness (Vigilance)

Question	0	1	2	3
Can maintain alertness during prolonged tasks	☐	☐	☐	☐
Performance declines over time	☐	☐	☐	☐
Makes errors due to inattention over time	☐	☐	☐	☐

B3. Hyper-alertness (Over-responsiveness)

Question	0	1	2	3
Over-sensitive to stimuli	☐	☐	☐	☐
Reacts too quickly / impulsively	☐	☐	☐	☐
Cannot ignore irrelevant stimuli	☐	☐	☐	☐
Constant environmental scanning	☐	☐	☐	☐

B4. Response Speed & Consistency

Question	0	1	2	3
Reaction time slower than expected	☐	☐	☐	☐
Responds too quickly and makes errors	☐	☐	☐	☐
Responses are inconsistent	☐	☐	☐	☐

Alertness Subtotal (L-score): ______ / 45

SECTION C — CLINICAL OBSERVATION (Clinician Rated)

Arousal Indicators

☐ Slowed / drowsy
☐ Normal
☐ Restless / agitated

Alertness Indicators

☐ Slow responses
☐ Missed cues
☐ Impulsive / premature responses

SCORING & INTERPRETATION

Severity Bands

Score	Interpretation
0–10	Normal
11–20	Mild
21–30	Moderate
>30	Severe

Pattern-Based Interpretation

Pattern	Likely Clinical State
↓ Arousal + ↓ Alertness	Depression / fatigue / hypoactive delirium
↑ Arousal + ↑ Alertness	Anxiety / PTSD (hypervigilance)
Normal Arousal + ↓ Alertness	ADHD (core pattern)
↕ Fluctuating both	Delirium / ASD / Pathological Demand Avoidance
↑ Arousal + ↓ Alertness	Anxiety with cognitive inefficiency

TRIAGE (Traffic Light System)

Zone	Criteria	Action
🟢 Green	Mild or normal	Monitor
🟠 Amber	Moderate	Further assessment
🔴 Red	Severe / fluctuating	Urgent evaluation

CLINICIAN SUMMARY

Primary Issue: ☐ Arousal ☐ Alertness ☐ Both
Pattern: ______________________________
Severity: ☐ Mild ☐ Moderate ☐ Severe
Next Step: ____________________________

How to Use This Tool (Practical Insight)

Use alongside:
- Cognitive screening
- Mental state examination
- Functional history
Particularly useful for:
- ADHD vs Anxiety vs Depression differentiation
- Delirium screening
- Neurodevelopmental profiling