Intro To Sensory

Question 1

Stimulus processing is usually_____ where is processing is usually____

Answer 1

Conscious And subconscious

Question 2

What is proprioception

Answer 2

Knowing where your body is in space

Question 3

Chemo receptors, what might they respond to

Answer 3

Oxygen change, pH change, various organic molecules such as glucose

Question 4

Give examples of mechanoreceptors

Answer 4

Pressure (BP = baroreceptors), cell stretch (osmoreceptors), vibration, acceleration, sound

Question 5

Photo receptors respond to

Answer 5

Photons of light

Question 6

Thermo receptors respond to

Answer 6

Varying degrees of heat

Question 7

A stimulus is converted into a graded potential via

Answer 7

Sensory transduction

Question 8

What is sensory transduction

Answer 8

Convert a stimulus into a change in membrane potential

Question 9

Adequate stimulus

Answer 9

A form of energy to which a sensory receptors most responsive

Question 10

Receptor potential

Answer 10

A graded potential but it’s in the sensory receptor

Question 11

Threshold

Answer 11

The minimum stimulus required to activate a receptor

Question 12

In order for sensory neurons to respond to a stimulus, that stimulus must fall within a specific physical area called

Answer 12

The receptive field which is the area that a stimulus needs to be present to be noticed

Question 13

Bev to stimulus is our very close together they may

Answer 13

Filter into one neuron and only send one signal to the brain instead of two

Question 14

True or false? The primary sensory neurons converge on one secondary sensory neuron and information from only one secondary neuron goes to the brain? Can this happen?

Answer 14

True, yes it can

Question 15

Why is the sensory pathway for olfaction different?

Answer 15

Most sensory pathways go through the thalamus but the old factory pathway starts at the nose goes to the old factory bulb and then to the old factory cortex

Question 16

What is the function of the thalamus

Answer 16

The salmon is modified some relays information to specific cortical centres or areas of the brain

Question 17

What does equilibrium effect and where does it’s pathway project to?

Answer 17

It can affect balance so when drinking GABA is increase to the cerebellum which is where equilibrium pathway projects to

Question 18

What are four important properties of stimuli and define them

Answer 18

Modality: is the nature of the stimuli so each receptor is most responsive to one modality or type of stimulus. Location: which receptive fields are activated. Intensity: determined by the number of receptors activated and the frequency of action potential’s. Duration: how long the receptors are activated

Question 19

Talk about lateral inhibition and location

Answer 19

Pathway closest to the stimulus inhibits its neighbours To allow for a clear signal going to the brain and enhancement of the perception of the stimulus

Question 20

What happens if intensity and duration are high

Answer 20

There’s a higher frequency of action potential is generated some more neurotransmitters are being released

Question 21

Tonic receptors

Answer 21

Slowly adapting receptors that respond for the duration of a stimulus

Question 22

Phasic receptors

Answer 22

Rapidly adapt to a constant stimulus and turn off

Question 23

How does adaptation work in tonic receptors

Answer 23

It keeps responding and tends to respond for the whole duration like when you touch something hot. The number of action potentials is constant and the receptor potential doesn’t get back down in the image

Question 24

How does phasic receptors work with adaptation

Answer 24

They rapidly adapt a constant simulators and turn off so a lot of this would be like when you’re sitting on a chair or your shoes on your feet

Question 25

Adaptation allows us to?

Answer 25

Filter out extraneous sensory information and focus on what is important

Question 26

A stimulus above threshold initiates action potential’s in the sensory neuron that projects to the…

Answer 26

Central nervous system

Question 27

Stimulus intensity and duration are coded in the pattern of action potential’s reaching the…

Answer 27

Central nervous system

Question 28

Stimulus location in modality are coded according to which

Answer 28

Receptors are activated

Question 29

Each sensory pathway projects to…

Answer 29

A specific region of the cerebral cortex

Question 30

What are the four somatic senses

Answer 30

Touch (pressure and vibration) proprioception (determining where we are in space) temperature (thermo receptors) Nociception (pain and itch receptors)

Question 31

Sensory information is processed on

Answer 31

The opposite side of the brain then the body, crosses over at some point

Question 32

When does pain, temperature and course touch cross the midline

Answer 32

In the spinal cord

Question 33

Find touch vibration and pro Praia section pathways cross the midline

Answer 33

In the Medulla

Question 34

Sensory pathways, at this point secondary sensory neurons, synapse where?

Answer 34

In the thalamus

Question 35

Sensations are perceived in the

Answer 35

Primary somatic sensory cortex

Question 36

The amount of space on the somatosensory cortex devoted to each body part is proportional to

Answer 36

The sensitivity to that part so there are large area is devoted to the hands and face and they have come out with things called sensory homunculus