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Absolute Threshold and Vision

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What is the absolute threshold and how does it relate to vision? Provide an example of how this influences your perception of an object.

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Dear Student,
hi and thank you for using Brainmass. The solution below should get you started. In the question you posted, you are being asked to define absolute threshold as it relates to vision and to subsequently provide an example of this in terms of perception. You also indicated that you want a short answer. before going further, I would like to suggest an outline that you can use for answering this problem:

1. Definition of absolute threshold as it relates to vision - 150 words.
2. Application in observable human perception - another 150 words.

By following this simple outline, we can answer the problem you posted. The narrative below does that. Also, you can use the listed resources to further explore the topic. Good luck with your studies.

OTA 105878/Xenia Jones

Absolute Threshold & Vision

Absolute threshold refers to the smallest detectable level of stimulus. At this particular level, it is not ensured that the individual or person to whom that stimulus is directed or experienced can ...

Solution Summary

The solution provides information on what absolute threshold is as it relates to vision. It also explains how this influences perception of objects. Resources are listed for further exploration of the topic. A word version is also attached.

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Lock-and-key model of synaptic transmission, transducers, cortical arousal, brainwaves that characterize the deeper stages of sleep, drive-reduction theory, main goal of psychophysics, sense of vision, visual system sharpens, visual system of frogs, bug detectors

1) In the lock-and-key model of synaptic transmission, the "key" gets to the "lock" how? Is it by removal of synaptic vesicles, rapid conduction down to the axon, weak attractive forces of the lock, or diffusion across the cleft?

2) Which of these are transducers? Eardrum, the jnd, hair cells.

3) Which of the following would be likely to produce the most profound reduction of cortical arousal? Damage to the connections between the cortex and the subcortical systems, destruction of both the parasympathetic and sympathetic divisions of the autonomic nervous system, prolonged deprivation of REM sleep without deprivation of slow-wave sleep, or chronic addiction to amphetamines?

4) Which brainwaves characterize the deeper stages of sleep? Those that are high voltage/low frequency, high voltage/high frequency, low voltage/low frequency, low voltage/high frequency

5) According to drive-reduction theory, what is intrinsically awarding about sex? Is it the innate reinforcing quality of sexual stimulation and orgasm, the satisfaction that comes from innate need to reproduce, the rise in tension that occurs during sexual stimulation, or the removal of tension after orgasm?

6) What is the main goal of psychophysics? Is it to relate physical intensity of stimuli to neuronal functioning, to understand the processes of transduction, to understand how psychological processes can result in physical actions, or to relate the properties of stimuli to attributes of sensation?

7)If a psychologist asserts that a certain animal's sense of vision is more sensitive than its sense of hearing, what does that mean? The animal's absolute threshold for vision is lower than its absolute threshold for hearing, the animal's difference of threshold for vision is smaller than its difference threshold for hearing, the animal's Weber fraction for vision is smaller than its Weber fraction for hearing, or all three?

8) When the visual system sharpens fuzzy boundaries by creating sharp boundaries where physically, none is present, what is this effect exemplified by? Is it the brightness contrast, the stabilized image, the mach bands, or both the brightness contrast and the mach bands?

9) At what level of the visual system do frogs' so-called bug detectors operate? Is it at the level of the receptors, at the level of the ganglion cells, at the level of the superior colliculus, or at the level of the visual cortex?

(Questions are also included in attachment)

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