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- Which statement about color perception theory is true? The mechanisms involved in opponent-process theory take place earlier in the perceptual process than those involved in trichromatic theory. The processes proposed by both trichromatic theory and opponent-process theory take place in the primary visual cortex. Trichromatic theory and opponent-process theory are both strongly supported by behavioral and physiological evidence. Recently, trichromatic theory has overtaken opponent-process theory as the best explanation of color and hue perception.Some somatic senses are fast-adapting and others are slow-adapting. Two different types of receptors are listed below. Explain the advantage using an example, for it to be slow or fast. Then explain, using an example, for why it would be harmful if it was the opposite type. Temperature receptor for cold temperatures, fast-adapting 2.Muscle-spindle proprioceptor, slow-adaptingAn example of a sensory neuron is one that leads from a pain receptor in the finger to the spinal cord. A pin can be pressed against the skin without eliciting a response from the pain receptor. However, if the pin is jabbed into the finger, the pain receptor may be stimulated and the finger would quickly withdrawn through a reflex arc. How do we sense different types of pain (very painful vs. not painful at all)? Using what you understand about threshold potentials and the all-or-none principle, explain how it is possible to sense different levels of pain. question is in bold
- Which is true regarding somatotopic organization? Select one: a. Certain areas of the body have much higher representation in the primary somatosensory cortex than other areas, and these regions will have finer tactile discrimination. b. The representation of a given area of the body in the primary somatosensory cortex is directly proportional to the size of that body area (e.g., the right index finger has less representation than the right thigh). c. The receptive fields for somatosensory neurons are circular and relatively consistent in size across areas of the body, but areas of the body with the finest tactile discrimination have many more neurons representing them in the primary somatosensory cortex. d. There is equal representation of all areas of the body in the primary somatosensory cortexIn the process of sensory coding Recruitment of additional neurons occurs with a weak stimulus in order to make the stimulus stronger. The larger the receptive field of a sensory receptor, the greater the expected acuity and the more accurate the two-point discrimination. Lateral inhibition of neighboring receptors resulting in a relative reduction of action potentials in the neighboring second order neurons would be expected to increase acuity. A receptor potential that remains suprathreshold into the absolute refractory period will result in additional action potentials.What are some general similarities in how receptive fields are represented by the nervous system? What advantage does this give us with respect to those senses?
- What are the similarities in how receptive fields are represented by the nervous system? What advantage does this give us with respect to senses?A single orientation column contains neurons a. with a wide range of orientation preferences. b. with a wide range of taste preferences. c. with no orientation preferences. d. with the same orientation preference.The animal in the image below has 22 spikey appendages radiating from its nose that help it search through soil for small insects to eat. This star organ is highly sensitive to touch and is heavily innervated. Two-point discrimination experiments reveal that some of the appendages have a denser array of sensory receptors than any other appendages. If you were able to examine the somatosensory cortex of this animal, what organization might you expect to see? In your response, make comparisons to sensory systems in other animals.
- True or false: At the center of the fovea, each P-type RGC’s receptive field contains just one photoreceptor. Reminder: these RGCs are color-opponent.Neurons with ___ receptive fields would respond best to ____ spatial frequencies. A large; low B small; high C All of the above. D None of the above. Individual neurons are never tuned to spatial frequency.We discussed three principles with regards to the sensory cortex (mechanisms of perception), with one of them being a hierarchical organization. Using the somatosensory system as an example (specifically the exteroceptive part of that system), state each level of the hierarchy with regards to this system, beginning with the one at the lowest level of the hierarchy to the final uppermost level. give the name at each level as it corresponds with this system.