Sensory Processes and Perception

Auditory cortex (Temporal lobe)

• Processes visual information from the eyes

• Processes auditory information from the ears

• Regulates motor functions in the brain

• Controls emotional responses

Skin: Mechanoreceptors

• Mechanoreceptors detect touch, pressure, and stretch.

• Mechanoreceptors are responsible for detecting temperature changes.

• Mechanoreceptors are involved in the perception of pain.

• Mechanoreceptors are primarily located in the muscles.

The brain uses electrical signals from sensory receptors to interpret stimuli

• Sensory receptors convert external stimuli into electrical signals, which are sent to the brain for interpretation.

• The brain interprets stimuli without any input from sensory receptors.

• Electrical signals are generated by the brain to create stimuli.

• Sensory receptors only respond to visual stimuli, not other senses.

Process of Tasting or Gustation:

• Tastants are absorbed directly into the bloodstream.

• Taste receptor cells send electrical signals to the brain through certain cranial nerves.

• The gustatory cortex is located in the stomach.

• Taste perception is solely based on the taste buds.

Process of Smelling or Olfaction

• Odorant molecules enter the nasal cavity, dissolve in mucus, and bind to olfactory receptors.

• Olfactory receptors are located in the lungs and send signals to the heart.

• Smell is primarily detected by the eyes and interpreted by the visual cortex.

• Odorant molecules are filtered by the skin before reaching the brain.

Process of Seeing or Vision

• Light enters the eye and is focused on the retina, where photoreceptors convert light into electrical signals.

• The brain directly interprets images without the need for light.

• Vision is solely dependent on the shape of the eye and does not involve the brain.

• Photoreceptors in the skin convert light into electrical signals.

Ear: Cochlear Hair Cells

• Cochlear hair cells convert sound waves into electrical signals that the brain uses to understand sound.

• Cochlear hair cells amplify sound waves before they reach the brain.

• Cochlear hair cells filter out background noise to enhance sound clarity.

• Cochlear hair cells are responsible for producing sound waves in the ear.

Process of Smelling or Olfaction:

• Odorant molecules are absorbed directly into the bloodstream.

• Odorant molecules enter the nasal cavity, dissolve in mucus, and bind to olfactory receptors.

• Odorant molecules are filtered by the lungs before reaching the brain.

• Odorant molecules are converted into heat before being sensed.

Tongue: Gustatory/Taste Cells in Taste Buds

• Taste cells detect, identify, and establish the taste of specific chemicals (tastants) present in foods and beverages.

• Taste cells are responsible for the production of saliva in the mouth.

• Taste cells are involved in the mechanical breakdown of food.

• Taste cells primarily function in the absorption of nutrients.

Process of Touching or Somatosensation

• Skin receptors convert external stimuli into electrical signals that are sent to the spinal cord and then to the somatosensory cortex of the brain.

• Skin receptors only detect temperature changes and do not respond to pressure.

• The brain directly perceives touch without any signals from the skin receptors.

• Touch sensation is solely dependent on the visual system.