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Lecture 13

NEUR 2P37 Lecture Notes - Lecture 13: Ventromedial Prefrontal Cortex, Basolateral Amygdala, Medial Forebrain BundlePremium

7 pages81 viewsWinter 2017

Department
Neuroscience
Course Code
NEUR 2P37
Professor
nickslothouber
Lecture
13

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NEUR2P37
Brain and Behaviour II
Wednesday, March 8th, 2017
Emotion II
Core Limbic Structures: Amygdala and Hypothalamus
Amygdala: Externally Generated States and Drives
Much of the input to the amygdala is from the outside world
Output from the amygdala
- Down to the brainstem and spinal cord
- To hypothalamic nuclei that are important for secreting hormones
- Up to the striatum and the cortex
a. Input pathways to the amygdala
b. Some of the major subdivisions of the amygdala, including the basolateral nuclei and the
centromedial and cortical nuclei
The basolateral amygdala tracks value and projects to the cortex
The centromedial amygdala projects to and influences the hypothalamus and brainstem
The amygdala is important for fear learning in classical conditioning experiments
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An unconditioned stimulus (US), pain, and a condition stimulus (CS), a noise, are
presented together
Both the US and the CS stimulate the basolateral amygdala and are paired together,
stimulating the central nucleus of the amygdala
The output from the central nucleus trigger the freezing behaviours and activation of
the autonomic nervous system
Over a few trials of learning, the connection between these nuclei are strengthened, so
that the noise comes to trigger the response on its own
The Amygdala and Emotional Experience
Damage to the amygdala can impact behaviour and emotions
Monkeys w/ bilateral damage to the amygdala develop Kluver-Bucy syndrome
In humans w. damage to the bilateral amygdala, patients have difficulty learning and
expressing fear
Hippocampus: Emotional Memories
The hippocampus can be functionally subdivided into the posterior and anterior
hippocampus
- The posterior hippocampus is involved in spatial functions
- The anterior hippocampus in involved in emotional memory
The amygdala and anterior hippocampus are important for emotional episodic
memories, and the posterior hippocampus is important for spatial memories and
navigation
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