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In this study, six colors (vivid red, vivid blue, vivid yellow, pale red, pale blue, and pale yellow†) were manipulated in a simulated study environment to determine their effects on university students' learning performance, emotions, and heart rate. It was hypothesized that learning, physiological and emotional states would be affected by different colors in private study spaces. A total of 24 undergraduate and postgraduate students participated in this study. The dependent variables were reading task performance, emotional responses, and changes in heart rate. The results showed that, although participants assessed the situation as relaxed, calm, and pleasant in the pale color conditions, reading scores were significantly higher in the vivid color conditions. Heart rates were significantly affected by hue; they increased in the red and yellow conditions. In addition, the results suggested that, regardless of the degree of whiteness, the hue had a significant impact on participants' emotions; blue increased relaxation and calmness feelings of participants compared to the other colors. Implications of these findings and suggestions for further research are discussed. © 2015 Wiley Periodicals, Inc. Col Res Appl, 41, 196-205, 2016 [ABSTRACT FROM AUTHOR]