Question

The least possible level of sensation is called as _______

• A. Olfaction
• B. Threshold
• C. Hearing
• D. Smell

Hint:

Think of a threshold like a doorway. You must step over the bottom beam (the minimum energy) to actually enter the room (the state of being sensed). If the energy is below the beam, you stay outside and feel nothing.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question seeks the scientific term for the minimum amount of stimulation required for a sense to detect it, a concept from psychophysics.
Step 2: Detailed Explanation:

• Concept of Threshold: In sensory science, a "threshold" marks the boundary between a detectable and an undetectable stimulus. It represents the minimum intensity needed for a sense organ to register a stimulus.
  
• Absolute Threshold: This concept is more formally known as the "Absolute Threshold." It is defined as the lowest level of a stimulus (such as light, sound, or touch) that a person can detect 50% of the time under specific conditions. For example, the absolute threshold for sight is the faintest light visible in total darkness.
  
• Psychophysical Significance: Studying thresholds allows scientists to measure the sensitivity of our senses and understand how they can change due to factors like age, health, and environment.
  
• Distinguishing Options: The other options are incorrect. Olfaction (A) and Smell (D) are synonyms for the sense of smell itself. Hearing (C) is the sensory perception of sound. These are types of sensations, not the minimum level required for detection.
  
• Sensory Processing: The process of sensation begins once a stimulus reaches its threshold, which activates a neural signal in the sensory receptors. This signal is then sent to the brain for interpretation. A stimulus that falls below this level is considered "subliminal."
  

Step 3: Final Answer:
The term "Threshold" accurately describes the minimum quantitative level of a stimulus required for a sensation to be registered by the nervous system.

Answer 2

This question is really asking you to separate a measure from a type of sensation. Looking at what each option actually represents makes the distinction clear.

1. Olfaction: Olfaction is simply the technical name for the sense of smell itself, a category of sensation, not a measurement of how much stimulus is needed to trigger any sensation.
2. Threshold: A threshold is not a sense at all, it's a measurable quantity, the minimum intensity of any stimulus (light, sound, touch, taste, smell) that is just strong enough to be detected. This is a general concept that applies across every sense, which is exactly what "least possible level of sensation" is describing.
3. Hearing: Hearing is the sense used to perceive sound waves, again a category of sensation rather than a measure of minimum detectable intensity.
4. Smell: Smell is the everyday name for the same sense as olfaction, still a type of sensation, not a quantity describing detection limits.

Three of the four options simply name specific senses, while only one names the measurable boundary at which any sensation first becomes detectable, which is what the question is actually asking for.

Therefore, the correct answer is Threshold.