When Do Citations Reflect "Impact?"

Citation practices vary between and within STM and HSS; they also vary by discipline and within disciplines. Though citation metrics presume evidence of “impact,” in fact a citation may represent a range of intentions. Given the emphasis on citation indices, isn’t it important to query what scholars are actually doing when they cite another scholar’s work?

Why are Authors Citing Older Papers?

Scholars are citing an increasingly aging collection of scholarship. Does this reflect the growing ease with accessing the literature, or a structural shift in the way science is funded–and the way scientists are rewarded?

Growing Impact of Older Articles

Scholars are citing proportionally more older material, a new Google paper reports. Digital publishing and delivery, and better search engines can only explain part of the trend. Something much bigger is taking place.