The share of the online adults who watch videos on video-sharing sites has nearly doubled (from 30% to 60%) since 2006, (Pew internet, 2009 survey), especially the generation between age 18 to 29, nearly 9/10 internet users ages 18-29 now say that they watch content on video sharing sites, also the survey found that there are no significant differences across income or education groups when looking at the use of video sharing sites.
Therefore, the educational use of video on campus is accelerating rapidly across the whole world including nearly all disciplines.
For it 1) Provide a context for learning( Brow, Collin,&Duguid,1989), students are not isolated from the “cold textbook”, all the knowledge presented by the video are like an intrigued story which will highly arouse students’ motivation at the beginning or lead to reflective thinking after the class. In this way, knowledge is less inert (Bonk, 2008).
2) Foster students dual coding of information (Paivio, 1986) and increase leaner retention of information (Fox, 2003). When educators teach a abstract concept, like Behaviorism, they maybe confused with “Negative reinforcement” and “punishment”, even with a vivid description for those two terms, students might still store these knowledge into their short-term memory. So instead of using words or textbook, a video how children get punishment or negative reinforcement may help them possess these two terms into their long-term memory. So next time, it is much easier for them to recall these 2 items.
However, there are also some points teacher need to be more careful when using some videos in their class, like the video should be shorter, most of the time, 1-4 minutes are ideal, and it should closely linked to the knowledge which teacher want to presented.
I once had a class called “teaching method for XXXX”, during the middle of the class; the teacher played almost four 45 minutes video for us to watch!!! Sure at first we all excited, because the video provided us with real teaching method that might help us integrated into our future teaching style. But things begin to get out of control at last, students’ attendance decreased significantly. In the third class, only 7 students show up (24 students in total), they all felt that since it is available online, why should I spend the whole time watching it in classroom? So teacher should be really careful to use the appropriate video.
Speaking of watching educational video at home, Salman Khan, the most popular teacher on the “
Youtube Kingdom”, created his own non-profit teaching website “ ” (http://www.khanacademy.org/)%20with almost 1400 educational videos. All the videos are mini-lecture ( around 10 minutes) and low-tech: Viewers only see the scrawls of equations or bad drawings that Mr. Khan writes on his digital sketchpad software as he narrates. All his class was started with MR. Khan best known area-math and engineering, and then he added biology, chemistry and even history classes into “ Khan Academy ”. How did he add these areas that his is not familiar? Khan Academy
"I took two weeks off and I just pondered it, and I called every professor and everyone I could talk to and I said, Let's go have a glass of wine about entropy. After about two weeks it clicked in my brain, and I said, now I'm willing to make a video about entropy."
Well, a really brilliant idea, but as some people say, they all worry that the videos may contain errors or lead students astray. And also as some teacher pointed out, what bother them most is the lack of identifiable, high-quality content libraries and simple, reliable tools for customizing the video to their curricula. So I was thinking, maybe in the future time, more and more people will collaborate together (someone wrote the movie script, someone shoot the video, someone edit the video etc.), using various resources, to create a more professional and easy to use video website which contains most of the disciplines. Thus, it will provide more credible video resources for teachers, and enhance students’ performance.