Cns 18
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Cns 18

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    Cns 18 Cns 18 Presentation Transcript

    • Emotion
      • It is an outward expression of the internal state of an individual.
      • Mental component – Cognition
      • - Affective
      • - Conative changes
      • Physical component
      • Genesis of emotion: Hypothalamus and limbic system
      • Papez circuit
      • Orbito-insulo-temporo-cingulate areas
    • Emotions If only it were as simple as the diagrams below…
      • Hippocampus – determines the emotional relevance of incoming stimuli from the frontal cortex and the cingulate cortex
      • - involved in Declarative Memory (cold hard facts) taken in from cortical areas
      • sensory 2/3 areas hippocampus (LTP)
      • Amygdala – responsible for elaborating on the emotional response and directing the hypothalamus to respond.
    • Papez Circuit
    • Cognitive Circuit Precognitive Circuit Feedback
    • Emotion (continued)
        • Areas of the hypothalamus and limbic system
        • Aggression: Amygdala and hypothalamus.
        • Fear : Amygdala and hypothalamus
        • Rage: Wide area from lateral hypothalamus to central grey matter of mid-brain. It is also seen in decorticate animal.
        • Placidity: destructing amygdaloid bilaterally
          • Sham Rage
        • Feeding:
          • Hypothalamus (feeding and satiety centers).
        • Sexual drive and behavior: Neocortex plays a dominant role
          • Hypothalamus and limbic system ( cingulate gyrus and retrosplenial portion of limbic system- maternal feeling is lost)
    • Fear Response Before Training – a transient orienting response is induced to the sound Training – sound is paired with the shock After Training – placement in the box induces freezing when the sound is present.
    • Roles
      • Hypothalamus: Integrates the endocrine, autonomic and motor activities to form an appropriate emotional behavior.
      • Cerebral cortex : Detailed processing the conscious experience of emotional feeling and provides the neural mechanisms
      • Limbic system: elaboration and integration of the activity and also involved in ascending pathways to some areas in cortex.
    • Motivation
        • ‘ That which moves the will ’
        • Goal directed behavior (reward and punishment)
          • Hypothalamus and frontal cortex.
          • Reward centers : Ventromedial hypothalamic nuclei, amygdala, septum, thalamus, basal ganglia etc
          • Punishment centers : Mid brain- perventricular area of dorsomedial tegmentum which extends to periventricular structures of hypothalamus and thalamus