The primate amygdala represents the positive and negative value of visual stimuli during learning. Export

@article{citeulike:506468, abstract = {Visual stimuli can acquire positive or negative value through their association with rewards and punishments, a process called reinforcement learning. Although we now know a great deal about how the brain analyses visual information, we know little about how visual representations become linked with values. To study this process, we turned to the amygdala, a brain structure implicated in reinforcement learning. We recorded the activity of individual amygdala neurons in monkeys while abstract images acquired either positive or negative value through conditioning. After monkeys had learned the initial associations, we reversed image value assignments. We examined neural responses in relation to these reversals in order to estimate the relative contribution to neural activity of the sensory properties of images and their conditioned values. Here we show that changes in the values of images modulate neural activity, and that this modulation occurs rapidly enough to account for, and correlates with, monkeys' learning. Furthermore, distinct populations of neurons encode the positive and negative values of visual stimuli. Behavioural and physiological responses to visual stimuli may therefore be based in part on the plastic representation of value provided by the amygdala.}, author = {Paton, Joseph J. and Belova, Marina A. and Morrison, Sara E. and Salzman, C. Daniel}, citeulike-article-id = {506468}, citeulike-linkout-0 = {http://dx.doi.org/10.1038/nature04490}, citeulike-linkout-1 = {http://dx.doi.org/10.1038/nature04490}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/16482160}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=16482160}, day = {16}, doi = {10.1038/nature04490}, issn = {1476-4687}, journal = {Nature}, keywords = {amygdala, learning, monkey, neurophysiology, reward}, month = {February}, number = {7078}, pages = {865--870}, posted-at = {2006-06-29 00:31:02}, priority = {2}, title = {The primate amygdala represents the positive and negative value of visual stimuli during learning.}, url = {http://dx.doi.org/10.1038/nature04490}, volume = {439}, year = {2006} }

TY - JOUR ID - citeulike:506468 L3 - citeulike-article-id:506468 N2 - Visual stimuli can acquire positive or negative value through their association with rewards and punishments, a process called reinforcement learning. Although we now know a great deal about how the brain analyses visual information, we know little about how visual representations become linked with values. To study this process, we turned to the amygdala, a brain structure implicated in reinforcement learning. We recorded the activity of individual amygdala neurons in monkeys while abstract images acquired either positive or negative value through conditioning. After monkeys had learned the initial associations, we reversed image value assignments. We examined neural responses in relation to these reversals in order to estimate the relative contribution to neural activity of the sensory properties of images and their conditioned values. Here we show that changes in the values of images modulate neural activity, and that this modulation occurs rapidly enough to account for, and correlates with, monkeys' learning. Furthermore, distinct populations of neurons encode the positive and negative values of visual stimuli. Behavioural and physiological responses to visual stimuli may therefore be based in part on the plastic representation of value provided by the amygdala. IS - 7078 JF - Nature SN - 1476-4687 EP - 870 TI - The primate amygdala represents the positive and negative value of visual stimuli during learning. VL - 439 SP - 865 KW - amygdala KW - learning KW - monkey KW - neurophysiology KW - reward AU - Paton, Joseph AU - Belova, Marina AU - Morrison, Sara AU - Salzman, Daniel PY - 2006/02/16/ UR - http://dx.doi.org/10.1038/nature04490 ER -