Time-of-day differences and short-term stability of the neural response to monetary reward: A pilot study
Identifieur interne : 000B62 ( Main/Exploration ); précédent : 000B61; suivant : 000B63Time-of-day differences and short-term stability of the neural response to monetary reward: A pilot study
Auteurs : Brant P. Hasler ; Erika E. Forbes ; Peter L. FranzenSource :
- Psychiatry research [ 0165-1781 ] ; 2014.
Descripteurs français
- KwdFr :
- Adulte, Affect, Corps strié (physiopathologie), Encéphale (physiopathologie), Femelle, Horloges circadiennes, Humains, Imagerie par résonance magnétique, Jeune adulte, Mâle, Neuroimagerie fonctionnelle, Projets pilotes, Revenu, Rythme circadien, Récompense, Sommeil (physiologie), Vigilance (physiologie).
- MESH :
- physiologie : Sommeil, Vigilance.
- physiopathologie : Corps strié, Encéphale.
- Adulte, Affect, Femelle, Horloges circadiennes, Humains, Imagerie par résonance magnétique, Jeune adulte, Mâle, Neuroimagerie fonctionnelle, Projets pilotes, Revenu, Rythme circadien, Récompense.
English descriptors
- KwdEn :
- MESH :
- physiology : Sleep, Wakefulness.
- physiopathology : Brain, Corpus Striatum.
- Adult, Affect, Circadian Clocks, Circadian Rhythm, Female, Functional Neuroimaging, Humans, Income, Magnetic Resonance Imaging, Male, Pilot Projects, Reward, Young Adult.
Abstract
Human and animal studies indicate that reward function is modulated by the circadian clock that governs our daily sleep/wake rhythm. For example, a robust circadian rhythm exists in positive affect, which is lower in the morning hours and peaks in the afternoon. A handful of functional neuroimaging studies suggest that systematic diurnal variation exists in brain activity related to other functions, but no published human studies have examined daily variation in the neural processing of reward. In the present study, we attempt to advance this literature by using functional neuroimaging methods to examine time-of-day changes in the responsivity of the reward circuit. Using a within-person design and a functional magnetic resonance imaging (fMRI) monetary reward task, we compared morning and afternoon reward-related brain activation in a sample of healthy young adults within 24 h. Region of interest analyses focused on the striatum, and we hypothesized greater reward activation in the afternoon, concordant with the circadian peak in positive affect. Results were consistent with our hypothesis. Additionally, we counterbalanced the order of morning and afternoon scans in order to explore the short-term stability of the neural response. Whole-brain analyses showed a markedly higher reactivity to reward throughout the brain in the first scan relative to the second scan, consistent with habituation to the monetary reward stimuli. However, these effects did not appear to explain the time-of-day findings. In summary, we report the first preliminary evidence of circadian variation in the neural processing of reward. These findings have both methodological and theoretical implications.
Url:
DOI: 10.1016/j.pscychresns.2014.07.005
PubMed: 25092525
PubMed Central: 4157087
Affiliations:
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circadian clock that governs our daily sleep/wake rhythm. For example, a robust circadian
rhythm exists in positive affect, which is lower in the morning hours and peaks in the
afternoon. A handful of functional neuroimaging studies suggest that systematic diurnal
variation exists in brain activity related to other functions, but no published human
studies have examined daily variation in the neural processing of reward. In the present
study, we attempt to advance this literature by using functional neuroimaging methods to
examine time-of-day changes in the responsivity of the reward circuit. Using a
within-person design and a functional magnetic resonance imaging (fMRI) monetary reward
task, we compared morning and afternoon reward-related brain activation in a sample of
healthy young adults within 24 h. Region of interest analyses focused on the striatum, and
we hypothesized greater reward activation in the afternoon, concordant with the circadian
peak in positive affect. Results were consistent with our hypothesis. Additionally, we
counterbalanced the order of morning and afternoon scans in order to explore the
short-term stability of the neural response. Whole-brain analyses showed a markedly higher
reactivity to reward throughout the brain in the first scan relative to the second scan,
consistent with habituation to the monetary reward stimuli. However, these effects did not
appear to explain the time-of-day findings. In summary, we report the first preliminary
evidence of circadian variation in the neural processing of reward. These findings have
both methodological and theoretical implications.</p></div></front></TEI><affiliations><list></list><tree><noCountry><name sortKey="Forbes, Erika E" sort="Forbes, Erika E" uniqKey="Forbes E" first="Erika E." last="Forbes">Erika E. Forbes</name><name sortKey="Franzen, Peter L" sort="Franzen, Peter L" uniqKey="Franzen P" first="Peter L." last="Franzen">Peter L. Franzen</name><name sortKey="Hasler, Brant P" sort="Hasler, Brant P" uniqKey="Hasler B" first="Brant P." last="Hasler">Brant P. Hasler</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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