首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Discrete coding of reward probability and uncertainty by dopamine neurons
Authors:Fiorillo Christopher D  Tobler Philippe N  Schultz Wolfram
Institution:Institute of Physiology, University of Fribourg, CH-1700 Fribourg, Switzerland. cdf28@cam.ac.uk
Abstract:Uncertainty is critical in the measure of information and in assessing the accuracy of predictions. It is determined by probability P, being maximal at P = 0.5 and decreasing at higher and lower probabilities. Using distinct stimuli to indicate the probability of reward, we found that the phasic activation of dopamine neurons varied monotonically across the full range of probabilities, supporting past claims that this response codes the discrepancy between predicted and actual reward. In contrast, a previously unobserved response covaried with uncertainty and consisted of a gradual increase in activity until the potential time of reward. The coding of uncertainty suggests a possible role for dopamine signals in attention-based learning and risk-taking behavior.
Keywords:
本文献已被 PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号