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Psychology (9,695)
PSYC33H3 (39)

disorders of executive functioning and self awareness

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Eva Svoboda

Disorders of Executive Functioning and Self Awareness 2212012 40000 PM AuthorTurnerLevine Models of Executive Functioning and self awarenessExecutive functions can be defined as a collection of abilities that map Setting a personal goalWeighing alternativesSelecting a course of actionSequencing intervening eventsRegulating behavior to attain goal Control and direct of more basic lower level abilities Autonoetic awarenessthe unique human ability to maintain a consistent sense of self across timefrontal lobe function patients with frontal leucotomylobotomy have lost awareness of themselves as a continuing and changing entity with personal responsibility for such changeprefrontal cortex Awareness deficits following brain damageDeficit of personal agency or awareness of the self as separate from the environment yet free to act on it The region of the frontal lobes anterior to the motor strip The most recently evolvedOccupying about 30of the human cortical mantleFrontal lobe function Executive and self related functions have been defined in relation to patients with damage to the frontal lobes Dramatic deficits with executive and prefrontal functions treated mainly as synonymous Executive doctrine makes one vulnerable to shifting constructs depending on location damage within the frontal lobesPrefrontal cortex reciprocally interconnected with the rest of the brain Posterior subcortical and diffuse damage mimics damage through frontal systems disconnection Models of Executive PrefrontalFunctionsupervisory attention system thought and actionare controlled by processing mechanisms in routine versus novel situationsIn routine situationsresponses are automatic Without conscious awareness Action controlled by schemasautomated programs of achieving relevant goal states initiated by environmental triggers Routine active selectioncontrolled by a contention scheduling mechanism Schema activation value exceeds an established threshold is brought onlineall other competing schemata are suppressed through lateral inhibition processes The Supervisory Attentional System SAS Engaged when deliberate attention is needed forplanning or decision making trouble shootingnovel and difficult actionresisting habitual response tendencies and temptationsWhen routine environmental triggers of thought and action are insufficient to generate an appropriate response3 stages of action control strategic generation implementation monitoring disturbancesbehavioral rigidity and distractibility perseverative behavior rigidity when a single action schema is highly activated produced by unmodulated contention scheduling produce Distractibility results when multiple environmental triggers are activated
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