Textbook Question
How does your brain determine the volume and pitch of sounds?
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Ch. 29 The Senses
Taylor, Simon, Dickey, Hogan10th EditionCampbell Biology: Concepts & ConnectionsISBN: 9780136538783
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Table of contents
- Ch. 1 Biology: The Study of Scientific Life19
- Ch. 2 The Chemical Basis of Life17
- Ch. 3 The Molecules of Cells21
- Ch. 4 A Tour of the Cell20
- Ch. 5 The Working Cell17
- Ch. 6 How Cells Harvest Chemical Energy18
- Ch. 7 Photosynthesis: Using Light to Make Food15
- Ch. 8 The Cellular Basis of Reproduction and Inheritance22
- Ch. 9 Patterns of Inheritance17
- Ch. 10 Molecular Biology of the Gene13
- Ch. 11 How Genes Are Controlled13
- Ch. 12 DNA Technology and Genomics23
- Ch. 13 How Populations Evolve17
- Ch. 14 The Origin of Species19
- Ch. 15 Tracing Evolutionary History18
- Ch. 16 Microbial Life: Prokaryotes and Protists16
- Ch. 17 The Evolution of Plant and Fungal Diversity15
- Ch. 18 The Evolution of Invertebrate Diversity13
- Ch. 19 The Evolution of Vertebrate Diversity18
- Ch. 20 Unifying Concepts of Animal Structure and Function11
- Ch. 21 Nutrition and Digestion16
- Ch. 22 Gas Exchange16
- Ch. 23 Circulation17
- Ch. 24 The Immune System16
- Ch. 25 Control of Body Temperature and Water Balance20
- Ch. 26 Hormones and the Endocrine System10
- Ch. 27 Reproduction and Embryonic Development12
- Ch. 28 Nervous Systems10
- Ch. 29 The Senses12
- Ch. 30 How Animals Move19
- Ch. 31 Plant Structure, Growth, and Reproduction9
- Ch. 32 Plant Nutrition and Transport12
- Ch. 33 Control Systems in Plants15
- Ch. 34 The Biosphere: An Introduction to Earth's Diverse Environments15
- Ch. 35 Behavioral Adaptations to the Environment12
- Ch. 36 Population Ecology15
- Ch. 37 Communities and Ecosystems14
- Ch. 38 Conservation Biology14
Taylor, Simon, Dickey, Hogan10th EditionCampbell Biology: Concepts & ConnectionsISBN: 9780136538783Not the one you use?Change textbook
Chapter 29, Problem 9
Hold your right eye closed. With your left eye, look at the + in the image below. Starting from about two feet away, slowly bring your head closer while looking at the +. What happens to the dot when you get close to the image? What property of the eye's structure does this exercise demonstrate? 
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Step 1: Hold your right eye closed and look at the + sign with your left eye.
Step 2: Start from about two feet away from the image.
Step 3: Slowly bring your head closer to the image while keeping your left eye focused on the + sign.
Step 4: Observe what happens to the black dot as you get closer to the image.
Step 5: Understand that the black dot will disappear at a certain point, demonstrating the blind spot in your eye where the optic nerve exits the retina and lacks photoreceptors.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Visual Acuity
Visual acuity refers to the clarity or sharpness of vision, which is determined by the ability of the eye to resolve fine details. This concept is crucial for understanding how the eye perceives objects at varying distances. As you bring your head closer to the image, the visual acuity may change, affecting how the dot appears, demonstrating the eye's ability to focus.
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Accommodation
Accommodation is the process by which the eye adjusts its lens to focus on objects at different distances. When you move closer to the image, the ciliary muscles contract, changing the shape of the lens to maintain a clear image. This exercise illustrates the eye's accommodation mechanism, as the dot may appear to change or blur when the focus is adjusted.
Binocular Vision
Binocular vision is the ability to perceive a single three-dimensional image from two slightly different perspectives provided by each eye. This concept is relevant in the context of the exercise, as closing one eye alters depth perception and may affect how the dot and the plus sign are perceived. It highlights the importance of both eyes working together for optimal visual processing.
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Related Practice
Textbook Question
Eighty-year-old Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against the back of Mr. Johnson's skull. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. The problem was probably in the _________ . (Explain your answer.)
a. Auditory nerve leading to the brain
b. Hair cells in the cochlea
c. Bones of the middle ear
d. Fluid of the cochlea
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Textbook Question
When you first sit down to read in a coffee shop, the surroundings seem very loud. Yet after a few minutes reading you realize you hardly notice the noise at all. Why is that?
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Textbook Question
Construct a graph in which membrane potential is on the y axis and time is on the x axis. Then draw the action potentials that occur when a bitter flavor is absent, followed by the action potentials that result when a person tastes a bitter flavor.
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Textbook Question
We know that sea turtle hatchlings use Earth's magnetic field to navigate. Do they also use light cues from the moon to get from the sand to the ocean waves? Outline an experiment to answer this question.
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Textbook Question
Have you ever felt your ears ringing after listening to loud music? Can this permanently impair your hearing? Should manufacturers of music devices and producers of concerts be required to warn consumers? What effect might warnings have?
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