Sensation and Perception

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AP Psychology › Sensation and Perception

Questions 1 - 10
1

A series of lights rapidly blinking off and on in succession creates the illusion of motion. This effect, which is often used in animation pictures, is referred to as which of the following?

Phi phenomenon

Prägnanz effect

Gestaltian experience

Opponent-process theory

Explanation

The Gestalt laws of perception are a set of principles that govern the way humans tend to perceive visual stimuli as a collective whole, rather than discrete individual objects or events. Different names are given to the specific applications of this overarching principle. For example, the phi phenomenon refers to the tendency to perceive a series of lights blinking on and off down a line as a single light moving along, instead of a number of lights turning on and off for no apparent reason. The law of prägnanz (not the prägnanz effect that was listed as an answer choice) is the Gestalt law that suggests that people perceive visual stimuli in terms of the simplest explanation or form possible. Opponent-process theory is a concept of visual perception that explains why some colors seem to be incompatible (e.g. we might see a yellowish green, but we cannot really imagine a reddish green).

2

What is the name for the least amount of energy required for a sensation to take place?

The absolute threshold

The minimum threshold

Transduction

The just noticeable difference

Explanation

The minimum amount of energy for a stimulus to be registered as a sensation is known as the absolute threshold. Any stimulus that occurs too weakly to surpass this threshold will not result in a sensation, and will thus be undetected.

The just noticeable difference refers to the minimum amount of change in a stimulus necessary for a difference in its intensity to be recognized.

Transduction is the conversion of energy from one form into another, for example, from light energy into electrical energy during vision.

The minimum threshold may sound like the correct answer, but it is in fact not the correct term. The absolute threshold is the appropriate label for the phenomenon.

3

Which of the following is an example of synesthesia?

When solving math problems, Angela gets a certain taste in her mouth whenever she sees a certain digit– for example, she tastes the number 9 as sour.

George still feels pain in his left arm below the elbow, even though his left arm was amputated three years ago.

Ashley was in a car accident that resulted in severe head trauma, and now she cannot remember any events that occurred leading up to the accident or six months prior to it.

Taylor once ate pineapple pizza and got very sick to his stomach afterwards. He later learned that he had gotten the stomach flu and so his sickness had nothing to do with the pizza, but he still hates pineapple pizza.

Explanation

The situation with Angela is the best example of synesthesia—a phenomenon, in which stimulation of one sensory pathway triggers a response by a different, unrelated sensory pathway. People with synesthesia might see a certain color whenever they taste a certain food. The important thing to note is that in synesthetic perception, the person experiences the synesthetic connection as being projected outside the body, not just in the mind’s eye (e.g. Angela does not simply imagine the color red when she sees the letter A: she actually sees A as being colored red, even if it is printed in plain black font). The other situations described in the answer choices reflect other psychological phenomena. Ashley is experiencing amnesia; George, phantom limb syndrome; and Taylor, taste aversion.

4

Which of these is not a monocular depth cue?

Retinal disparity

Perspective

Relative size

Occlusion

Texture gradient

Explanation

Our brains use the differences in the location of an object on our retinas in order to judge their relative distance from one another. This requires two eyes, and thus is binocular. The other cues listed require only one eye (monocular).

5

What is a binocular cue for perceiving depth?

Retinal disparity

Accommodation

Assimilation

Heptactic cue

Ocular degeneration

Explanation

Retinal disparity is a binocular cue that involves observing the difference between the two images the retinas receive of a single object. The greater the difference, the closer the object is to the viewer.

6

Which of the following is an example of synesthesia?

When solving math problems, Angela gets a certain taste in her mouth whenever she sees a certain digit– for example, she tastes the number 9 as sour.

George still feels pain in his left arm below the elbow, even though his left arm was amputated three years ago.

Ashley was in a car accident that resulted in severe head trauma, and now she cannot remember any events that occurred leading up to the accident or six months prior to it.

Taylor once ate pineapple pizza and got very sick to his stomach afterwards. He later learned that he had gotten the stomach flu and so his sickness had nothing to do with the pizza, but he still hates pineapple pizza.

Explanation

The situation with Angela is the best example of synesthesia—a phenomenon, in which stimulation of one sensory pathway triggers a response by a different, unrelated sensory pathway. People with synesthesia might see a certain color whenever they taste a certain food. The important thing to note is that in synesthetic perception, the person experiences the synesthetic connection as being projected outside the body, not just in the mind’s eye (e.g. Angela does not simply imagine the color red when she sees the letter A: she actually sees A as being colored red, even if it is printed in plain black font). The other situations described in the answer choices reflect other psychological phenomena. Ashley is experiencing amnesia; George, phantom limb syndrome; and Taylor, taste aversion.

7

A series of lights rapidly blinking off and on in succession creates the illusion of motion. This effect, which is often used in animation pictures, is referred to as which of the following?

Phi phenomenon

Prägnanz effect

Gestaltian experience

Opponent-process theory

Explanation

The Gestalt laws of perception are a set of principles that govern the way humans tend to perceive visual stimuli as a collective whole, rather than discrete individual objects or events. Different names are given to the specific applications of this overarching principle. For example, the phi phenomenon refers to the tendency to perceive a series of lights blinking on and off down a line as a single light moving along, instead of a number of lights turning on and off for no apparent reason. The law of prägnanz (not the prägnanz effect that was listed as an answer choice) is the Gestalt law that suggests that people perceive visual stimuli in terms of the simplest explanation or form possible. Opponent-process theory is a concept of visual perception that explains why some colors seem to be incompatible (e.g. we might see a yellowish green, but we cannot really imagine a reddish green).

8

Which of the following is not a monocular depth cue?

Retinal disparity

Relative size cue

Texture gradient

Linear perspective

Explanation

“Retinal disparity” is a binocular depth cue, not a monocular cue. The other answers—relative size cue, texture gradient, and linear perspective—are all monocular cues.

9

Which of the following describes the difference between sensation and perception?

Sensation is a bottom-up process and perception is a top-down process

Sensation requires transduction an perception does not

Perception requires transduction and sensation does not

None of these

Perception is a bottom-up process and sensation is a top-down process

Explanation

Sensation can be described as the process of how our nervous system and sensory receptors receive and translate stimuli from our environment. Perception is the process by which our brains organize and interpret sensory stimuli, which allows us to recognize significant events and objects. Sensation functions as a bottom-up process because it starts at a smaller level and works its way up (i.e. from sensory receptors to processing centers). Perception functions as a top-down process because it starts at a larger level and gets smaller as it continues (i.e. from the sensory input down to our expectations and experiences).

10

Which of the following is the term for information that is processed below the threshold for conscious awareness?

Subliminal

Paranormal

Subtypical

Unconsciousness

Explanation

"Subliminal" is defined as "beneath the threshold" and it refers to information which is processed without entering into consciousness. Such information has been demonstrated to impact decision making in laboratory conditions, but failed to provide a significant enough influence to justify its use in advertising or politics. This allayed the concerns over a possible "brainwashing" of the public by the media which arose when this phenomenon was discovered.

Though in Freudian terminology the subconsciousness is described as a component of mental life which is inaccessible to regular consciousness, "unconsciousness" does not match this or the correct answer to the question. Finally, subliminal information is not "paranormal," or outside of the natural laws of physics, in any regard, and neither is it "subtypical", which is in fact, not a word at all.

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