Main Features of the Main Features of the ModelModel

• System 1 is fast, autonomous, reflexive, and inexpensive System 1 is fast, autonomous, reflexive, and inexpensive but vulnerable to errorbut vulnerable to error

• System 2 is slow, deliberate, methodical but costly; it System 2 is slow, deliberate, methodical but costly; it makes few errorsmakes few errors

• CDRs, ADRs, and affective responses are all in System 1CDRs, ADRs, and affective responses are all in System 1• Repetitive activations of System 2 can get something Repetitive activations of System 2 can get something

into System 1 into System 1 • System 2 can override System 1(executive control)System 2 can override System 1(executive control)• System 1 can override System 2 (dysrationalia)System 1 can override System 2 (dysrationalia)• Cognitive Miser function – the brain always tries to Cognitive Miser function – the brain always tries to

default into System 1default into System 1

Hard wiringHard wiringAmbient conditions/ContextAmbient conditions/ContextTask characteristicsTask characteristicsAge and ExperienceAge and ExperienceAffective stateAffective stateGenderGenderPersonalityPersonality

EducationEducationTrainingTrainingCritical thinkingCritical thinkingLogical competenceLogical competenceRationalityRationalityFeedbackFeedbackIntellectual abilityIntellectual ability

Pattern Recognition

Repetition

Executiveoverride

Dysrationaliaoverride Calibration Diagnosis

PatientPresentation

PatternProcessor

RECOGNIZED

NOTRECOGNIZED

System

11

System

22

Dual Process Model of Clinical ReasoningDual Process Model of Clinical Reasoning