The hypothesis that human fetuses are capable of perceiving pain in the first trimester has little support, although fetuses at 8 weeks respond to touch. Some media describe a scientific "consensus", based on a 2005 study, that a fetus is not capable of feeling pain until the third trimester, specifically "around 29 to 30 weeks' gestational age, based on the limited data available." The 2010 review discussed below, however, suggested pain perception cannot begin before 24 weeks, and after revisiting the evidence in 2020, a co-author of that review posited "an immediate and unreflective pain experience...from as early as 12 weeks."