1. The point at which a stimulus can be detected 50% of the times presented. Just Noticeable Difference Difference Threshold Absolute Threshold Perception

2. Any aspect of change in the environment the which an organism responds. Stimulus Sensation Perception JND

3. When the strength of a stimulus is below someone’s absolute threshold, it is called Supraliminal Subliminal Sensory experience Perception

4. The organization of sensory information into meaningful experiences. Sensation Just Noticeable Difference Stimulus Perception

5. When your sensory receptors adapt to the constant sensations, it is called… Signal Detection Theory Sensory Adaptation Perception Sensation

6. The idea that there is no absolute threshold for everyone, and individual thresholds differ based upon many factors is from… Signal Detection Theory Sensory Adaptation Perception Sensation

7. This terms refers to your ability of the brain to take in outside information and recognize it based upon previous knowledge and experience. Sensation Perception Threshold Adaptation

8. Sensory receptors sending information to the brain is called a… Sensation Perception Threshold Adaptation

Vision Vision is the most studied of all of the senses. Who believes it is the most important?? Introduction Video

Light Light is a form of electromagnetic radiation. There is a large spectrum of electromagnetic radiation, and only a small sliver of it is visible to the human eye. The color of an object we see depends upon what types of light the object reflects.

Electromagnetic Spectrum

Frequency of Light Waves

Amplitude of Light

Frequency and Amplitude Lower frequencies are warmer colors Red, yellow, and orange Higher frequencies are cooler colors Violet, blue, and green High amplitudes are vivid colors Low amplitudes are pale/weak colors

Anatomy of the Eye

Group Activity Split up randomly into groups of 3 Each member in the group will get receive three handouts with parts of the eye. You will teach each other as a group the parts of the eye and fill out the boxes in your handout with the name of the part of the eye and its function. Video

Definitions Pupil Lens Retina Vitreous Humor the opening in the iris that regulates the amount of light entering the eye. Lens A flexible, elastic, transparent structure in the eye that changes its shape to focus light on the retina. Retina The innermost coating of the back of the eye, containing light-sensitive receptor cells Vitreous Humor The transparent jellylike tissue filling the eyeball behind the lens.

Definitions Optic Nerve The nerve that carries impulses from the retina to the brain Fovea Area on the retina with the highest proportion of cone receptors, and responsible for central vision. Cornea The transparent layer forming the front of the eye. Iris A flat, colored, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the center.

Accommodation When your lens changes its shape in order to focus upon an object. Nearsightedness Having difficulty seeing objects far away Farsighted Having difficulty seeing object near Pencil Activity

Rods and Cones Light-sensitive receptor cells, located within the retina. Responsible for transduction, the process of taking the physical stimulus of light and turning into electrical signals sent to the brain. Send the electrical signals through the optic nerve to the occipital lobe.

Cones Rods Responsible for color vision Located on or near the fovea 6-7 million within each eye Work the best in daylight Responsible for twilight vision Located in the periphery of the retina. Around 120 million in each eye Work the best in darkness Marker Activity

Blue Man Group