Question 1

Which of the following most closely approximates the meaning of the term noise as psychophysicists use it?

Accepted Answer

Psychophysicists use the term "noise" to refer to any distracting stimuli, not just unwanted auditory stimuli. Noise can refer to any stimuli, including visual or tactile, that interfere with the perception of other stimuli or have no relevance to the task at hand.

Question 2

A(n)_____ threshold is the stimulus intensity that is detected 50% of the time.

Accepted Answer

The absolute threshold refers to the minimum intensity of a stimulus that can be detected by a person 50% of the time. This means that anything below this minimum intensity will not be perceived by the person. The other options, such as difference threshold (the minimum difference in stimuli required for a person to detect a change), adaptation threshold (the point at which a person's sensory receptors become less responsive to a stimulus over time), and frequency threshold (the lowest frequency of sound or light that can be sensed by a person) are not the same as the absolute threshold.

Question 3

A snack manufacturer realizes that he must increase the salt content of his company's chips by 3% in order for a sample of consumers to notice that the chips are saltier than they were before.This example most nearly illustrates the concept of a(n):

Accepted Answer

The scenario described in the question is an example of a difference threshold. This is because the manufacturer is increasing the salt content by a specific percentage in order to make it noticeable to consumers, which is a change in the stimulus from its previous level. The difference threshold refers to the smallest detectable difference between two stimuli, and in this case, the 3% increase in salt content is the minimum amount needed for consumers to perceive a difference in taste.

Question 4

Anna is reading her psychology text.The activation of receptors in her retina by a source of physical energy is called _____.

Accepted Answer

The activation of receptors in the retina by a source of physical energy is known as sensation. Perception involves the interpretation and organization of sensory information. Integration refers to the combination of sensory information from multiple sources. Interpretation involves the understanding and meaning-making of sensory information.

Question 5

A(n)_____ is the smallest intensity of a stimulus that must be present for the stimulus to be detected.

Accepted Answer

The concept of absolute threshold refers to the smallest intensity of a stimulus that must be present for the stimulus to be detected. The other options, such as difference threshold and adaptation threshold, refer to different concepts related to the detection and processing of stimuli but not specifically to the minimum intensity required for detection.

Question 6

The function relating the value of a stimulus along some dimension to the just noticeable difference is known as _____ law.

Accepted Answer

Weber's law states that the just noticeable difference is proportional to the magnitude of the stimulus in question. This law is important to understanding how we perceive differences in stimuli, and has been used to investigate sensory processes in both humans and animals.

Question 7

The activation of the sense organs by a source of physical energy is known as _____.

Accepted Answer

The activation of the sense organs by a source of physical energy is known as sensation. Perception is the process by which the brain interprets sensory information, integration refers to the process of combining sensory information from different sensory organs, and interpretation is the process of assigning meaning to sensory information.

Question 8

One can detect a single drop of perfume diffused in an area the size of a one-bedroom apartment.This is due to:

Accepted Answer

The ability to detect a single drop of perfume in a large area is an example of absolute threshold, which refers to the minimum amount of stimulation needed for a person to detect a particular stimulus.

Question 9

_____ is a basic law of psychophysics stating that a just noticeable difference is a constant proportion to the intensity of an initial stimulus.

Accepted Answer

Weber's law states that the difference threshold (or just noticeable difference) is a constant proportion of the original stimulus. Specifically, this proportion is determined by the Weber fraction, which varies depending on the sensory domain in question. This law has important implications for our ability to discriminate between different stimuli across a range of sensations, from sound and light to taste and touch.

Question 10

The smallest level of added or reduced stimulation required to sense that a change in stimulation has occurred is known as the _____.

Accepted Answer

The difference threshold (also known as the just noticeable difference) is the smallest level of added or reduced stimulation required for a person to notice that a change in stimulation has occurred. The absolute threshold refers to the minimum level of stimulation needed to detect a particular stimulus. The adaptation threshold is not a commonly used term in sensory psychology. The intensity threshold is not a defined term in psychology.

Question 11

The sorting out,interpretation,analysis,and integration of stimuli by the sense organs and brain is known as _____.

Accepted Answer

Perception refers to the process of giving meaning or interpreting the sensory information received by the sense organs and brain. Sensation, on the other hand, is the initial process of detecting and receiving sensory information. Activation and stimulation are not as specific in describing the process of sensory information processing as perception or sensation.

Question 12

The study of the relationship between the physical aspects of stimuli and our psychological experience of them is known as _____.

Accepted Answer

Psychophysics is the study of the relationship between physical stimuli and psychological experience. Developmental psychology focuses on the study of human development across the lifespan, while thermodynamics is a branch of physics that deals with the relationships between heat and other forms of energy. Experimental psychology is a broad field that encompasses many different types of research, including psychophysics.

Question 13

Which of the following statements is TRUE of sensation and perception?

Accepted Answer

Sensation refers to the initial detection of a stimulus through the activation of sensory receptors, while perception involves the interpretation and organization of sensory input into meaningful information. Therefore, sensation involves the activation of sense receptors, whereas perception involves interpretation. Option A is incorrect because sensation always precedes perception. Option B is incorrect because although they are related concepts, they are not synonyms. Option C is incorrect because sensation, not perception, involves the initial interpretation of a stimulus.

Question 14

In the context of what we see in our world,the range of wavelengths that humans are sensitive to is called the _____.

Accepted Answer

The visual spectrum is the range of wavelengths that can be detected by the human eye, which is typically between 400 and 700 nanometers. The other options (power spectrum, mass spectrum, and frequency spectrum) refer to different types of spectra that are not directly related to human sensitivity to light.

Question 15

Dr.Breiland examines the relationship between the physical properties of light,such as its amplitude and wavelength,and human perception of color.Which of the following terms most accurately describes Dr.Breiland's field of study?

Accepted Answer

Psychophysics is the field of study that examines the relationship between physical stimuli and human perception. In this case, Dr.Breiland is examining the physical properties of light and how they relate to human perception of color, making B the best choice. The other options are not applicable to this specific field of study.

Question 16

Weber's law states that a just noticeable difference is a _____.

Accepted Answer

Weber's law states that a just noticeable difference (JND) between two stimuli is proportional to the magnitude of the initial stimulus. Specifically, the JND is a constant proportion of the intensity of the initial stimulus. This means that as the intensity of the initial stimulus increases, the JND also increases proportionally. Therefore, the correct answer is B.

Question 17

_____ is an adjustment in sensory capacity after prolonged exposure to unchanging stimuli.

Accepted Answer

Adaptation is a process by which our sensory organs adjust to prolonged exposure to unchanging stimuli by decreasing their sensitivity to them. This allows us to focus on new or changing stimuli in our environment. Accommodation refers to the adjustment of the lens of the eye to see objects at different distances, while acclimation refers to the adaptation of the body to changes in environmental conditions. Attenuation refers to the reduction in the intensity of a signal or sound as it travels through a medium.

Question 18

Acme Foods wants to make its chips saltier,but it doesn't want to spend more than it has to on salt.A sample of consumers are asked to compare its current chip (saltiness = 100)with saltier versions and to say whether the new version is saltier.On average,sample consumers reliably say the new chip is saltier when its saltiness value is 108,but not when its saltiness value is below 108.Assuming Acme Foods' sample consumers are representative of people in general,which of the following best represents the just noticeable difference for saltiness?

Accepted Answer

The just noticeable difference (JND) is the minimum amount of change in a stimulus that can be detected by a person. In this case, the JND for saltiness is the smallest increase in saltiness value that consumers reliably perceive as saltier. From the given information, the JND for saltiness is 8 because consumers perceive the new chip as saltier when its saltiness value is increased by 8 (from 100 to 108) but not when it is increased by any smaller amount. Therefore, the correct answer is A) 8%.

Question 19

"It's so noisy! How can you stand it?" remarks Caitlyn as the thruway traffic screams past her friend Dave's ground floor apartment."I don't even notice it anymore," Dave replies.This exchange best exemplifies the concept of:

Accepted Answer

Dave's response indicates that he has become accustomed to the noise and it no longer bothers him. This is an example of adaptation, which refers to the process of adjusting to a new or changing environment over time. The other options (B, C, and D) are not as applicable to this scenario. Accommodation typically refers to changing one's beliefs or behaviors to fit a new situation, rather than physical adaptation to an environment. Acclimation refers to the process of becoming accustomed to a new climate or environment, but it usually involves a shorter time frame than the level of habituation described in this scenario. Attenuation refers to the reduction of a signal or stimulus, which is not as relevant in this scenario since the noise level has not changed.

Question 20

Which of the following laws would help explain why a person in a quiet room is more startled by the ringing of a telephone than a person who is already in a noisy room?

Accepted Answer

Weber's law explains the principle of just noticeable difference, which states that the ratio of the increment threshold to the background intensity is constant. In the context of the question, this means that a person in a quiet room will notice the ringing of a telephone more than someone in a noisy room because the relative increase in intensity is greater for the person in the quiet room.

Quiz 4: Sensation and Perception