RT Journal Article
SR Electronic
T1 Activation of Dorsal Raphe Serotonin Neurons Is Necessary for Waiting for Delayed Rewards
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 10451
OP 10457
DO 10.1523/JNEUROSCI.0915-12.2012
VO 32
IS 31
A1 Miyazaki, Kayoko W.
A1 Miyazaki, Katsuhiko
A1 Doya, Kenji
YR 2012
UL http://www.jneurosci.org/content/32/31/10451.abstract
AB The forebrain serotonergic system is a crucial component in the control of impulsive behaviors. We previously reported that the activity of serotonin neurons in the midbrain dorsal raphe nucleus increased when rats performed a task that required them to wait for delayed rewards. However, the causal relationship between serotonin neural activity and the tolerance for the delayed reward remained unclear. Here, we test whether the inhibition of serotonin neural activity by the local application of the 5-HT1A receptor agonist 8-hydroxy-2-(di-n-propylamino) tetralin in the dorsal raphe nucleus impairs rats' tolerance for delayed rewards. Rats performed a sequential food-water navigation task that required them to visit food and water sites alternately via a tone site to get rewards at both sites after delays. During the short (2 s) delayed reward condition, the inhibition of serotonin neural activity did not significantly influence the numbers of reward choice errors (nosepoke at an incorrect reward site following a conditioned reinforcer tone), reward wait errors (failure to wait for the delayed rewards), or total trials (sum of reward choice errors, reward wait errors, and acquired rewards). By contrast, during the long (7–11 s) delayed reward condition, the number of wait errors significantly increased while the numbers of total trials and choice errors did not significantly change. These results indicate that the activation of dorsal raphe serotonin neurons is necessary for waiting for long delayed rewards and suggest that elevated serotonin activity facilitates waiting behavior when there is the prospect of forthcoming rewards.