@article{https://resolver.caltech.edu/CaltechAUTHORS:20151211-151926584, title = "Unit Activity: Motivation-Dependent Responses from Midbrain Neurons", journal = "Science", year = "1969", url = "https://resolver.caltech.edu/CaltechAUTHORS:20151211-151926584", id = "record", issn = "0036-8075", doi = "10.1126/science.165.3899.1269", volume = "165" }