callum is clearly concerned. he goes from where he is to the person filming. he sees trousers. i think he thinks it's his dad. he loo for them, but there's no change in his expression, essentially. whereas in ryan, in 1o seconds, it goes fromoh, no, they're not really leaving me" to "my g, they're gone and he's crying. sooas they co back in, he's comforted. it's all there in those tapes. you can see the essence of autism. the inability to understand means and ends, causality, how to make thing happen and happen again, all that kind of investigary behaviors, and most importantly, of course, the use of other people make the wholthing work for them, the depth and richness-- it's real painful to watch. nce tism was first described, several theories re put forth toxpin t disde r 15, 2o yea, tycay, ople blamethpants in oneayr anot focausine ausm, which caused tremendous tredy. t toe blamedild witht ow why...s and itas an awful circle th was most unfortunate because there were no data to suprt that. anybbelievess knowit's an organic cae.ld codn't be arou theskidsnd not know. that brea