Visuelle Wahrnehmung
Quiz Fragen zu der Vorlesung
Quiz Fragen zu der Vorlesung
Set of flashcards Details
| Flashcards | 151 |
|---|---|
| Language | English |
| Category | Computer Science |
| Level | University |
| Created / Updated | 01.11.2017 / 27.01.2018 |
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4: --- is the founder of psychophysics.
Fechner
4: --- is the ability to detect a stimulus and, perhaps, to turn that detection into a private experience.
Sensation
4: If a stimulus is absent but the observer reports it as present, this is called a
4: Weber proposed that the smallest change in a stimulus that can be detected is a(n) --- proportion of the stimulus level.
constant
4: --- describes the relationship between a stimulus and its resulting sensation by proposing that the JND is a constant fraction of the stimulus intensity.
Weber’s law
4: In signal detection theory, the --- is an internal threshold that is set by the observer.
criterion
4: --- is a psychophysical method in which the participant assigns values according to perceived magnitudes of the stimuli.
Magnitude estimation
10 - In the case of a negative afterimage, a yellow stimulus would produce a --- afterimage.
10 - Which one of the following is not a basic colour term?
10- --- is the idea that basic perceptual experiences may be determined in part by the cultural environment
10 - A --- is an individual who suffers from colour blindness that is due to the absence of M-cones.
10 - A --- is an individual who suffers from colour blindness that is due to the absence of L-cones.
10 - A --- is an individual who suffers from colour blindness that is due to the absence of S-cones.
10 - How many lights (of the correct type) are required to match any colour that humans can see?
(More precisely: can be made indistinguishable?)
10 - Which scientist developed the colour-matching technique?
1 Light: bluish == bluish: 3 Lights: Blue, Green, Red
10 - Mixing paints to create new colours is an example of --- colour mixing
10- Shininh lights to create new colours is an example of --- colour mixing
10: Which of the following is not one of the colour-opponent pairs coded by the visual system?
10: Which og the following colour pairs is furthest apart in wavelength?
10: --- is a colour perception effect in which the colour of one region induces the opponent colour in a neighboring region.
10: --- is a colour perception effect in which two colours bleed into each other, each taking on some of the chromatic quality of the other.
10: According to the --- theory, the colour of any light is defined in our visual system by the relationships among three numbers of a set.
10: --- is the inability to perceivecolours due to damage to the central nervous system
10: Some animals achieve colour vision not with different photopigments, but rather with
10: Which of the following is not a type of cone?
10: What type of lighting conditions occurs during the daytime in full sunlight?
10: In the hue cancellation experiments described in the textbook, if starting colour were too reddish, you would add
10: Which of the following colours is "illegal" for our visual systems?
10: --- are different mixtures of wavelengths that look identical
10: What is the term for the light that illuminates a surface?
10: Name the three steps in colour perception as discussed in the textbook, and briefly describe each one
The three steps are detection, during which wavelengths must be sensed by the photoreceptors, discrimination, during which different wavelengths and combinations of wavelengths are differentiated from each other, and appearance, during which colours are intelligently assigned to objects in the world based on both their sensed colour and scene layout.
10: What kind of lighting conditions are depicted in the photograph?
(gräulich, See, Berge, Mondschein)
10: The principle of univariance refers to the fact that
10: A unique blue is a blue that has no --- or green tint
10: Which of the following is not a unique hue?
10: Which of the following is a typical argument from the textbook about the usefulness of colour vision?
10: What is an afterimage and what does it reveal about how colour perception works?
An afterimage is the continued sensory experience of a stimulus after the stimulus is no longer being viewed. Due to colour neurons fatiguing (or, more accurately, habituating), the afterimage takes on the opposite colour of the inducing stimulus, thereby demonstrating that colour perception involves opponent pairs of colours (red vs. green, blue vs. yellow, and white vs. black).
10: What is a unique hue?
A unique hue is either red, green, blue, or yellow and contains no elements of any other colour. For example, a unique yellow is one that contains no red or green in it, a unique green is one that contains no blue or yellow, and so on. Unique hues are determined through colour cancellation experiments in which, for example, some red is added to a greenish-blue light to cancel out the green and leave only blue. The ability to cancel out red, green, yellow, or blue from a hue demonstrates the existence of colour-opponent mechanisms.
10: What is colour constancy and how does the visual system achieve it?
Colour constancy is the tendency of surfaces to appear to be the same colour under a wide range of illumination conditions, despite the fact that the spectral reflectance function of the surface changes dramatically under different light sources. Colour constancy allows for a stability of perceptual experience across different lighting situations. The visual system achieves colour constancy by taking the illuminant (light source) into account when determining the final appearance of colours. Essentially, the spectral power distribution of a scene is registered by the visual system and subtracted away from the final percept to yield perceptions of colour that are stable across vast changes in the illuminant.
10: What is the difference between additive and subtractive colour mixing?
Additive colour mixing involves combinations of light, while subtractive colour mixing (usually) involves mixtures of pigments. In additive colour mixing, the parts of the visible spectrum contained in each coloured light are combined, while in subtractive colour mixing, the parts of the visible spectrum that are absorbed in each colour pigment are combined.
