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Brain development and temporal discounting

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Eveline Jansen

on 29 October 2012

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Transcript of Brain development and temporal discounting

Temporal Discounting Definition: decrease in the subjective value of a commodity as a function of the amount of and delay to that commodity, or reward
(Bickel and Johnson, 2003)
Temporal discount-task: choice between two rewards separated in time
People tend to go for smaller sooner rewards than larger later rewards
(Ballard and Knutson, 2008)
Younger people have a higher tendency to go for immediate reward than older people
(Green, Fry, and Myerson, 1994)
Why and what cause? Introduction "Why do younger people not care about saving for their retirement?"

Why do younger people want immediate rewards?
Why do older people have a more long-term vision?
How does the brain develop?

Research question: '‘Do young people have a short-term view in comparison to old people, and if so, how does this develop over time?’?' Research proposal presentation Mirjam van Zetten
Eveline Jansen
Barbara Wilton
Tanne Jans Beta/delta system Beta area: impulsive, immediate reward
Ventral striatum
Medial orbifrontal cortex
Medial prefrontal cortex

Delta area: self-control, long-term
Dorso lateral prefrontal cortex
Ventro lateral prefrontal cortex
Lateral orbifrontal cortex
Infero parietal cortex Balance beta/delta system There is a certain balance between beta and delta Lower delta: brain development Development and maturing of brain not simultaneously
OFC and vmPFC mature last
Areas involved in higher decision-making
Reason for lack of ability to delay rewards Hypothesis: beta/delta balance changes over time
1. Younger people have a higher beta
cause: more dopamine
2. Younger people have a lower delta
cause: undeveloped brain areas Higher beta: dopamine Function dopamine (involvement in reward)
VS (reward-related learning)
MOC (representation of reward)
MPF (reinforcement)
Dopamine peaks during adolescence Experiment and possible results Financial rewards
Different temporal horizon
€100 now or €150 in one month? Expected result Alternative Questions?
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