Study Guide 3

Study Guide 3 - Perception Study Guide 1) Be prepared to...

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Perception Study Guide 1) Be prepared to incorporate the stories from MWM into each of the disorders below 2) Know the roles of both the anterior parietal lobe (aka somatosensory cortex) and the posterior parietal lobe. a. Anterior Parietal Lobe (front) – contains the somatosensory cortex, which encodes sensory information having to do with touch (pressure pain and temperature) b. Posterior Parietal Lobe (back) – contains the motor cortex, which encodes information for how our limbs should move c. Be able to describe the purpose of the sensory homunculus. i.The homunculus is a figure that shows what proportions of the somatosensory cortex are devoted to each body part. That is why the hands, face and mouth are huge compared to the back, hips, feet, etc… The more cortical space that a body part takes up, the more neurons are used to handle information from that body part and the more sensitive that body part is to touch (same is true for the motor cortex and fine motor movement) 3) What are the three ways that we get a sense of balance (and body position)? a. The three ways that we get a sense of balance is through the processes of proprioception, the vestibular system using the inner ear and vision. b. Be able to describe proprioception – what are the pathways involved in knowing where our body parts are without peeking (feedback loop)? Include the specific pathways from muscles/tendons to brain. i.Proprioception is the sense we have of where the different parts of our body are at all times. It gives us constant feedback so that we are about to control how are limbs move in space without having to look at them. ii.Pathways of Proprioception – there is a feedback loop that is involved with proprioception. Our muscle spindles and the tendon golgi from each of our limbs sends information to the position the limb (can tell if the muscles are stretched, stretched muscles/tendons send out action potentials). This information travels up the dorsal route of the spine on the same side of the body that receives it from the dorsal root ganglion, where the neurons are collected from the body, until it reaches the brain stem, where the information switches side so that information from the left side of the body goes to the right side of the brain and visa versa. From there, the information travels to the thalamus and then on to the somatosensory cortex, where the information is processes, and then behind it where proprioception is processed. Information for how the person wants the limb to move is then sent out from the motor cortex, down the ventral route, back down to the muscles and tendons, which then send information back up. 1. For Christina (the woman without proprioception), the information got up to her anterior parietal lobe, where it was blocked by something 2. For syphilis patients, the ganglions get damaged so they lose feeling in their legs c. Know the vestibular system (and what occurs in the ears) i.The vestibular system, which gets its signal from the inner ear, helps us know
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Study Guide 3 - Perception Study Guide 1) Be prepared to...

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