Biopsychology. The Biological Basis of Behavior. Neurons: Structure. Dendrites Cell Body Axon Myelin Sheath Nodes of Ranvier Terminal Buttons. p. 45. Normally Functioning Nerves. The Synapse. Synaptic Vesicles Synaptic Cleft Receptor Sites Presynaptic membrane Postsynaptic membrane
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The Biological Basis of Behavior
Brain & Spinal Cord
Where are the seats of consciousness?The Endocrine System The Brain Stem
A:Handedness (the preference to use one hand over the other) is species-specific. In humans, about 90% prefer to use their right hand. What does this mean? Recall that the human brain is divided into a right and a left hemisphere. Typically, the left hemisphere in humans is dominant. We\'re not really sure why the left rather than the right (or both) becomes dominant, but probably it reflects the early fetal environment, particularly hormonal factors. Since the left hemisphere controls the right side of the body, people with left hemisphere dominance will be right-handed. For left-handers and for those who are ambidextrous (can use both hands with the same level of skill), the right hemisphere tends to be dominant. Interestingly, language, which typically is the province of the dominant hemisphere, is equally likely to reside in either the left or right hemisphere for non-right-handed people. Those who are left-handed or ambidextrous also tend to have a thicker corpus callosum (the bundle of fibers joining the two hemispheres).