murderers?
people with very high IQs?
people who prefers the same sex to love?
do you think it is because of their genes OR because of their environment and how they were brought up?
Individuals who are 'intelligent' or have 'high IQs' are nothing special, imho.
There is a physiological/medical explanation for everything.
Individuals with excellent memory and retrieval of memory and understanding of concepts (mathematics, science, linguistics etc) is because of the development of their nervous system.
Within a nervous system, there is the CNS, and the PNS. The CNS = Central Nervous System and the PNS = Peripheral Nervous System.
Medically speaking, in the central nervous system messages are propagated from the brain and spinal cord via a anterograde direction with help of the oligodendrocytes that covers and invaginates around the axon that runs and connects one neuron to another via the synaptic clefts. Because of the -65mV gradient in the axolemma there is a 1/10th concentration of NA++ (sodium) inside the axolemma and there is a high presence of Sodium ions outside in the extracellular space. There is also a high concentration of K (potassium) inside the plasma. However, when electrical impulses are transversed form the brain to its terminal destination, the impulses changes the membrane in that it allows the NA ion channels to open thus allowing all the NA ions to enter the membrane due to the natural gradient (via passive diffusion). This continues until the charge within the particular neural membrane changes to +30mV and this leads to a closure of the NA ion channels and prevents NA form coming in; this presence alters the K presence in that K will flow back due to attraction to the positively charged NA ions inside. This forces the NA to be removed out and K invagination propagates the electrical impuse from one axon to the the next axon until it reaches the terminal end; thereby allowing the release of neurotransmitters or neuromodulators (such as epinephrine or norepinephrine calcitonin, etc) and leads to its direct effect on glands, muscles, or other parts of the brain to retrieve information. etc.
Critical to the immediacy of electrical nerve impulses in its trajectory is the proper myelination of axons via Oligodendrocytes, Schwann Cells, Astrocytes, Glial Cells etc. These structures form a fatty deposit and covers the axon thereby allowing it to conduct the electrical neuronal impulses. The myelin sheath forms a protective layering almost like the plastic covering that is above copper wires to allow and enhance the flow of messages in a telephone wire, cable wire etc.
Naturally and physiologically speaking, the thicker an individual's myelin sheath are (which are impeded or regulated or enhanced by the level of schwann cell, oligodendrocytic activity etc). Thereby allowing the quick afferent and efferent relaying of neuronal information to its terminal sites.
All of which, are genetically determined. Genetics plays a role in the status of the axon of a person's given brian, and the wiring of their cerebral and medullar cortex.
An individual with excellent wiring in the neuronal aspects will, by right of physiological explanation, will have a faster memory recognition, faster and more effective understanding of concepts, memory imputing. And an individual with weaker neuronal wirings will, by right of physiology, have a weaker faculty.
Biology and Science explains everything.
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