Problem 4 -the architect Flashcards
Neurotransmitters influencing behavior - Cloninger’s Theory
Dopamine
Seretonin
norepinephrine/noradrenaline
Dopamine
- response to pleasurable, exciting stimuli
- signals of reward
- high levels of dopamine -> high levels of Novelty Seeking
- novelty seeking -> excitability, impulsiveness, extravagance, disorderliness
- parkinson
- cocain
Seretonin
- inhibits response to harmful, unpleasant stimuli
- high levels of seretonin -> low levels of Harm Avoidance
- harm avoidance -> worry, pessimism, fear, shyness, fatigability
-antidepressants like Prozac increases Seretonin to inhibit the transmission of punishment signals resulting in less negative emotions
Norepinephrine/ noradrenaline
- inhibits response to stimuli that have previously been associated with pleasure
- high levels of Norepinephrine -> low reward dependence
- reward dependence -> sentimentality, warm communication, dependence
Jeffrey Gray’s reinforcement sensitivity theory
- suggested that regions of brain work together as mechanisms that underly personality
- differences among activity of systems -> basis of important personality dimensions
Jeffrey Gray’s 3 systems
1) The behavioral activations system
2) The behavioral inhibition system
3) Flight or fight system
The behavioral activation system
- go system
- regions of brain responsible for receiving signals which indicate that rewards are being expressed
- encourages pursuit of rewards
- people differ in tendency to be impulsive and seek pleasure+ excitement
- similar to Novelty seeking by Cloninger
The behavioral inhibition system
- stop system
- brain areas receiving signals which indicate that punishments are experienced
- similar to Harm avoidance by Cloninger
Flight or fight system
-brain regions responsible for motivating extreme reactions in response to extremely threatening situations
Eysneck’s theory
- proposed a theory involving 2 major dimensions of personality
- later a third dimension was added
- Extraversion
- Neuroticism
- Psychoticism
Extraversion VS Introversion
Eysneck
-the strength of reactions to stimuli depends on the arousability of the brain
Extraverted people -> prefer to experience strong sensations
-enjoy bright colors, loud noises etc
-enjoy meeting and interacting with lots of people
Ascending Reticular Activation System (ARAS)
Eysenck
- Eysenck believed that individual differences in Extraversion were governed by this brain mechanism
- system located in brain stem
- works as filter that regulates amount of stimulation that is admitted to brain from nervous system
Ascending Reticular Actication System (ARAS) - Extraverts
Eysenck
- ARAS admits little stimulation
- making one feel under-aroused
- thus seeking stimulation
- opposite for Introverts
Neuroticism VS. Emotional Stability
Eysenck
- Eysneck believed that if one’s Limbic system is overwhelmed by stressful stimuli -> tends to have a neurotic personality
- neurotic people tend to feel great deal of worry and nervousness in response to problems
Psychoticism
- aggressiveness, manipulation, tough-mindedness, risk taking, irresponsibility, impulsivity
- Eysencl suggested that persons high in Psychoticism -> high levels of hormone testosterone
- > low levels of mono-amine oxidase (MAO)