Category: Accessibility Personas Description: Users with motor control impairments affecting precise movements, such as essential tremor, Parkinson's disease, or other neuromuscular conditions

Overview

Motor tremor users have involuntary shaking that affects precise motor tasks. This includes small click targets, drag-and-drop, hover states, and any element requiring steady movement. Conditions range from essential tremor to Parkinson's disease and age-related motor changes.

These users compensate with keyboard navigation, arm stabilization, assistive technologies, and deliberate targeting. They have learned patience with themselves and with interfaces.

Generous click targets, keyboard alternatives, and forgiving patterns help motor tremor users. These improvements also benefit touchscreen users in vehicles and those with temporary motor impairments.

Trait Profile

All values on 0.0-1.0 scale.

Core Traits (Tier 1)

Trait	Value	Rationale
patience	0.9	Developed through necessity; understand that interactions will take more time
riskTolerance	0.2	Very cautious; misclicks can have unwanted consequences
comprehension	0.7	Unaffected by motor impairment; cognitive abilities intact
persistence	0.8	High; committed to completing tasks despite physical challenges
curiosity	0.5	Moderate; exploration limited by interaction cost
workingMemory	0.7	Normal capacity; may be partially occupied by motor planning
readingTendency	0.6	Moderate; read carefully to avoid needing re-interaction

Emotional Traits (Tier 2)

Trait	Value	Rationale
resilience	0.7	Developed through adapting to physical challenges
selfEfficacy	0.6	Confident in abilities but aware of limitations
trustCalibration	0.6	Appropriately cautious about committing to actions
interruptRecovery	0.6	Moderate; interruptions less costly than for some personas

Decision-Making Traits (Tier 3)

Trait	Value	Rationale
satisficing	0.3	Low; prefer to choose carefully to avoid need for corrections
informationForaging	0.6	Thorough to reduce need for repeated navigation
anchoringBias	0.5	Moderate; don't favor first option if requiring corrections
timeHorizon	0.6	Willing to invest time upfront to avoid future corrections
attributionStyle	0.5	Understand interaction between personal abilities and interface design

Planning Traits (Tier 4)

Trait	Value	Rationale
metacognitivePlanning	0.7	Plan interactions carefully to minimize motor demands
proceduralFluency	0.6	Develop routines but each interaction requires conscious effort
transferLearning	0.6	Apply accessibility patterns across contexts

Perception Traits (Tier 5)

Trait	Value	Rationale
changeBlindness	0.5	Normal visual attention; may miss changes during motor focus
mentalModelRigidity	0.5	Moderate; expect accessibility considerations

Social Traits (Tier 6)

Trait	Value	Rationale
authoritySensitivity	0.5	Moderate; evaluate based on accessibility support
emotionalContagion	0.5	Normal emotional sensitivity
fomo	0.4	Lower; focused on accessible experiences
socialProofSensitivity	0.5	Value accessibility reviews from others with motor impairments

Behavioral Patterns

Navigation

Motor tremor users favor keyboard navigation over mouse/touch. When using a pointer, they approach targets slowly with arm stabilization. Large click targets help. Hover-dependent interactions are avoided. Sticky menus requiring precise mouse control are especially challenging.

Decision Making

Decisions are careful because correction costs are high. Users prefer understanding all implications before acting. Preview is valuable. Undo without re-navigation is essential.

Error Recovery

Misclick errors are frustrating and common. Error recovery should not require precise motor control. Confirmation dialogs need well-spaced buttons. Undo reduces the cost of accidental clicks.

Abandonment Triggers

Small click targets (under 44x44 pixels)
Hover-only interactions with no click alternative
Drag-and-drop without keyboard alternative
Time-limited interactions during data entry
Sliding/swiping interactions requiring precise control
Double-click requirements
Captchas requiring precise interaction

UX Recommendations

Challenge	Recommendation
Small click targets	Minimum 44x44 pixel touch targets; larger for primary actions
Precision requirements	Forgiving click areas; expand clickable region beyond visual boundary
Hover interactions	Provide click/keyboard alternatives; persistent hover states
Drag and drop	Keyboard alternatives; click-to-select + click-to-place pattern
Misclick recovery	Generous undo; confirmation for destructive actions
Time pressure	Disable timeouts for form inputs; extend session limits
Complex gestures	Simple tap/click alternatives to swipes and multi-touch

Research Basis

Trewin, S. & Pain, H. (1999). Keyboard and mouse errors due to motor impairments - Empirical studies
Keates, S. et al. (2002). Cursor measures for motion-impaired users - Design recommendations
WCAG 2.2 Target Size guidelines (2.5.5, 2.5.8) - Minimum target sizes
MacKenzie, I.S. & Jusoh, S. (2001). Evaluation of pointing devices for users with motor impairments
Wobbrock, J.O. & Gajos, K.Z. (2008). Ability-based design - Adapting interfaces to abilities

Usage

await cognitive_journey_init({
  persona: "motor-tremor",
  goal: "complete checkout",
  startUrl: "https://example.com"
});

npx cbrowser cognitive-journey --persona motor-tremor --start https://example.com --goal "complete checkout"

Persona MotorTremor