<P> Vision provides opportunity for the brain to perceive and respond to changes occurring around the body . Information , or stimuli , in the form of light enters the retina , where it excites a special type of neuron called a photoreceptor cell . A local graded potential begins in the photoreceptor , where it excites the cell enough for the impulse to be passed along through a track of neurons to the central nervous system . As the signal travels from photoreceptors to larger neurons , action potentials must be created for the signal to have enough strength to reach the CNS . If the stimulus does not warrant a strong enough response , it is said to not reach absolute threshold , and the body does not react . However , if the stimulus is strong enough to create an action potential in neurons away from the photoreceptor , the body will integrate the information and react appropriately . Visual information is processed in the occipital lobe of the CNS , specifically in the primary visual cortex . </P>
<P> Vision provides opportunity for the brain to perceive and respond to changes occurring around the body . Information , or stimuli , in the form of light enters the retina , where it excites a special type of neuron called a photoreceptor cell . A local graded potential begins in the photoreceptor , where it excites the cell enough for the impulse to be passed along through a track of neurons to the central nervous system . As the signal travels from photoreceptors to larger neurons , action potentials must be created for the signal to have enough strength to reach the CNS . If the stimulus does not warrant a strong enough response , it is said to not reach absolute threshold , and the body does not react . However , if the stimulus is strong enough to create an action potential in neurons away from the photoreceptor , the body will integrate the information and react appropriately . Visual information is processed in the occipital lobe of the CNS , specifically in the primary visual cortex . </P>
which of the following refers to the change from a physical stimulus to a neural impulse
which of the following refers to the change from a physical stimulus to a neural impulse
Vision
Vision