Critical Assessment of an Invasive Method of Investigating...

Critical Assessment of an Invasive Method of Investigating the Brain There are many different invasive ways of investigating thee brain including chemical stimulation, ablation and lesioning. All invasive methods artificially stimulate, and actually affect the brain. For my example I am going to look at electrical stimulation. The first person to study electrical stimulation on the brain was by Olds and Milner in 1954. They applied a weak current to the pleasure centre of the brain to a number of rats using small electrodes. The rats themselves could trigger the electrical stimulation themselves by pressing a lever. They found that apart from eating and sleeping the rats would press the lever†¦show more content†¦These discoveries where quite magnificent at the time and led the way for more research into the brain and then later development of PET and MRI scans. But there are still a great number of problems in this research and any research using electrical stimulation. For a start in the above experiment there was a very small sample of people used and therefore the results cannot be generalised to the rest of the human population. Also all of the patients had either brain tumours or epilepsy and therefore their brains were abnormal anyway. So none of the findings can be generalised to people with normal functioning brains. All experiments using electrical stimulation on the brain also lack ecological validity due to the fact that the impulses are abnormal and artificial. Therefore they may not reflect the actual function of the cortex. Also no one really knows what affect theses impulses are having on the brain, i.e. they could be damaging to the patients. 2. Describe and critically assess one non-invasive method of investigating the brain. (12) All non-invasive methods of investigating the brain do not actually affect the brain but watch its naturally sending its own electrical impulses. 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