a. What do sensory receptors do that allows the brain to process the world aroun

Question

a. What do sensory receptors do that allows the brain to process the world around us?

b. What happens to a primary sensory neuron when it detects a stimulus? What has to happen for the CNS to receive information from the primary sensory neuron?

c. What are the four types of sensory receptors and their corresponding stimuli?

d. What is a receptive field? Do primary sensory neurons or secondary sensory neurons have larger receptive fields and why?

e. Do cortical neurons associated with more sensitive sensory surfaces (e.g., hand, face) have larger or smaller receptive fields? Why?

f. Describe labeled line coding. Use menthol and cold temperature or capsacin and warm temperature receptors as an example.

g. How does spatial preservation allow the brain to determine a stimulus’s location?

h. Location of auditory cues is processed differently than spatial maps typical of the somatosensory and visual systems. How is location determined for sound?

i. Describe how lateral inhibition clarifies a stimulus location by increasing contrast between activated and inactive receptive fields.

j. How is stimulus intensity and duration coded for in sensory systems?

k. What is the difference between tonic and phasic sensory receptors and what type of information about a stimulus does each provide the brain?

Explanation / Answer

a)sensory receptors receives information and conducts a process of generating nerve impulse to be transmitted to the brain for interpretation and perception .

b) primary sensory neurons are the first in an afferent pathway. It spans from their receptive fields to the dorsal horn of the CNS yo convey information from the periphery

In the CNS the information is received, processed ,interpreted and sent to the PNS.

c) chemoreceptors- chemicals

Thermo receptors- temperature

Mechano receptors- pressure

Photo receptors- light

d)receptive field is the area of the body to which receptor organ and receptor cells respond.

Sensory neurons have larger receptive fields than primary sensory neurons as the primary sensory neurons converge to become smaller. Making secondary receptive field larger

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