Chapter 6 (Sensation)

Question 1

___: any energy capable of exciting a receptor

Answer 1

Stimulus

Question 2

To Perceive a Sensation . . . (4 Steps)

Answer 2

• A stimulus sufficient to initiate a response in the NS must be present
• A receptor must convert the stimulus to a nerve impulse
• The conduction of the nerve impulse must be transmitted from the receptor to the brain
• Interpretation of the impulse must occur in a specific portion of the brain

Question 3

The level of response is determined by the _____ of the stimulation

Answer 3

intensity

(– Rate law!!)

Question 4

These types of receptors continue to fire at a relatively constant rate as long as
the stimulus is maintained . . . Slow/fast to adapt

Answer 4

tonic receptors, slow to adapt

(example sitting down for a while, the constant pressure is being sensed by the tonic receptors)

Question 5

These types of receptors respond with a burst of APs when the stimulus is first
applied . . . But quickly ____ their rate of firing when the stimulus is maintained . . .

Answer 5

Phasic Receptors, reduce

(example sitting down, the sudden sensation of sitting down is done by phasic receptors)

Question 6

_____ are specialized nerve cells that transduce energy into neural signals

(T/F the have Axons?)

Answer 6

receptors

(F, they form synapses with dendrites of other sensory neurons)

Question 7

Receptors are “___” specific

Answer 7

mode,

“Law of Specific Nerve Energies”: sensory messages
are carried via separate pathways to different areas of
the brain, but all use the same neural impulse

Question 8

You would use your ____ to detect EMR emitted by objects.

Color is related to ___
Brightness is related to ____

Answer 8

visual system

wavelength
Intensity

Question 9

An eye consists of: (3 parts)

Answer 9

– Aperture (pupil) to admit light
– Lens that focuses light
– Photoreceptive elements (retina) that transduce the light stimulus