 So I am going to give him an object in his right hand. He will have time to move it around in his hands and he is going to understand what the object is. Then I am going to direct his left hand to this collection of objects and he is going to feel each of them and he is going to pick up the one which matches the object in his right hand. So let's start with the first one. Mike, here is your first object. Please feel it around. Okay. Now I am going to direct your hand here. I am going to pick up each and match and pick up the one which matches. That was too easy, wasn't it? Okay. So now let's do the same exercise again. We will keep that aside. Let's give you another object in your right hand. Okay. So he has again matched it with his left hand. Okay. Let's keep that aside. Let's give the third one. Ideally this test should have been done with very closely matching objects. And so widely different objects. Okay. Now feel this around in your hand. Now feel it. Okay. So he has matched the third object also. Let's... Okay. Okay. And finally we have the fifth object here. Sorry. Okay. So he has picked it up. Okay. So basically thank you very much. You have performed all the tests very successfully. And you have managed to... To make this test a little more complicated, what we should have done, we should have put very closely matching objects. That would have really tested his skill. It was so far different than he just picked up any state. Anyway, so by this test, you want to do something... You can put five different pens slightly different from each other. That will make it a little more difficult. They will have to palpate each pen very closely and then match each pen and then we have to do it. So they are going to make it a little more difficult for you. Don't give him too many. Three, three of each is enough. Okay. Don't let him see. I see him on the way out. Careful. You just have to feel all of them and decide. See, now it has to be a little more, isn't it? Okay. Let's give you another one. I'm just going to direct your hand and you have to do the palpation yourself. Feel yourself. It is matching, right? Yes. Yes, it is matching. I think he's done pretty good. I think he's done pretty good. Thank you very much, Mani. So, in most cases, there are several different things, several different functions of the brain. First, when he picked up an object in his right hand, he perceived it with his left brain. He understood it with his left brain. Which specific area? The somatosensory cortex and the superior parietal lobele of the left side. The information went to his vernicase. Vernicase made him understand what that object was. He remembered it. Then he picked up the same object with his left hand. What happened? The information from the left hand went to his right side. Went to his right somatosensory cortex, right superior parietal lobele which was for stereognosis, but he didn't understand it. From the right side, it came back to his vernicase on the left side through his corpus callosum. Yes, it came back through the corpus callosum to the left side to the vernicase and matched it with the object which was already there in his right hand. And then told him, yes, this is the same object. So you see, with this test we have demonstrated the function of this sensory cortex on one side, how it went through the corpus callosum to the vernicase and then how he matched it with the other side. So this is what we have done. We have integrated what we studied yesterday in the parietal lobele and what we saw today in the corpus callosum and this is how we dispersed stereognosis and how we matched the object. So obviously, if he had lost his corpus callosum callosul syndrome or transcautical apraxia what would have happened? When I directed his left hand to pick up the object he would not have been able to match it. Are we clear? That is transcautical apraxia. Clear? I think that's what we demonstrated. So that is the cerebral cortex. Tomorrow we are going to have a lab session and we will have to come a little early and help me out with taking out the brain specimens put your mask because it's going to be very strong smell and we will demonstrate the brain.