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What determines the capacity of short-term memory? Short-term memory plays a crucial role in how our consciousness operates. Several years ago a hypothesis has been formulated, according to which capacity of short-term memory depends in a special way on two cycles of brain electric activity. Scientists from the Nencki Institute of Experimental Biology of the Polish Academy of Sciences in Warsaw have now demonstrated this experimentally for the first time. A human being can consciously process from five to nine pieces of information simultaneously.
During processing these pieces of information remain in the short-term memory. In 1995 researchers from Brandeis University in Waltham suggested that the capacity of short-term memory could depend on two bands of brain's electric activity: theta and gamma waves. For an electroencephalography exam (EEG) several electrodes are placed on patient's head. A 'bite' of information refers to its portion in memory. Interpreting the length of theta and gamma waves from EEG recording is not easy either. Can the Brain Explain Your Mind? by Colin McGinn. The Tell-Tale Brain: A Neuroscientist’s Quest for What Makes Us Human by V.S. Ramachandran Norton, 357 pp., $26.95 Is studying the brain a good way to understand the mind? Is thinking what the brain does in the way that walking is what the body does? But there is a prima facie hitch with this approach: the relationship between mental function and brain anatomy is nowhere near as transparent as in the case of the body—we can’t just look and see what does what.
The consensus today is that there is a good deal of specialization in the brain, even down to very fine-grained capacities, such as our ability to detect color, shape, and motion—though there is also a degree of plasticity. This is not the usual way that biologists investigate function and structure, but it is certainly one way—if damage to the lungs hinders breathing, then the lungs are very likely the organ for breathing. Ramachandran discusses an enormous range of syndromes and topics in The Tell-Tale Brain.