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Chapter 27: Problem 5

What is the smallest difference in stimuli that can be detected? a. receptor potential b. sensory transduction c. just-noticeable difference d. perception

Short Answer

Expert verified
c. just-noticeable difference

Step by step solution

01

Understand the Question

The question is asking for the term that describes the smallest difference in stimuli that can be detected by the sensory system.
02

Define Each Term

Identify and define each option given in the question: - Receptor potential: A change in membrane potential in response to a stimulus at a sensory receptor. - Sensory transduction: The process by which a sensory receptor converts a stimulus into an electrical signal. - Just-noticeable difference: The minimum difference in stimulus intensity that can be detected. - Perception: The process by which the brain interprets sensory information.
03

Identify Key Concept

From the definitions, the term that directly refers to the smallest difference in stimuli that can be detected is 'just-noticeable difference.'
04

Select the Correct Answer

Based on the definitions and understanding of the key concepts, the correct answer is option c: just-noticeable difference.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

receptor potential
Receptor potential is a foundational concept in sensory systems. It refers to the change in the membrane potential of a sensory receptor cell when it is stimulated. Imagine touching a hot surface; the receptors in your skin convert this thermal energy into an electrical signal.

This electrical change happens due to ion movement across the cell membrane, making the inside of the cell either more positive or more negative.

Things you should know about receptor potential:
  • This change in energy is graded, meaning it varies in size depending on the strength of the stimulus.
  • It is the first step in the process of sensation.
  • Receptor potentials do not follow the 'all-or-none' law like action potentials do.

Understanding receptor potential helps explain how sensory information begins its journey from stimulus to brain.
sensory transduction
Sensory transduction is the essential process by which a sensory receptor converts a physical or chemical stimulus into an electrical signal.

Think of it as translating one form of energy into another. For example, in your eyes, light energy is transduced into electrical signals by photoreceptors in the retina.

Key points about sensory transduction:
  • This process allows the various sensory systems (sight, hearing, touch, etc.) to communicate with the brain.
  • Each type of sensory receptor is tuned to a specific type of stimulus energy.
  • The transduced signals are then processed and interpreted by the brain to form an experience or perception.

Sensory transduction plays a crucial role in how we interact with the world around us by converting external stimuli into meaningful information for the brain.
perception
Perception is the brain鈥檚 way of interpreting sensory information.

It's not just about receiving the stimuli; it's about making sense of it. When you hear a song, your ears pick up sound waves, but perception involves recognizing the melody.

Aspects of perception you should remember:
  • It involves complex processes by which the brain organizes and interprets sensory information.
  • Different people can perceive the same stimulus in varied ways due to individual differences and past experiences.
  • Perception is heavily influenced by attention and expectation.

Perception is what turns raw sensory data into a coherent and understandable reality. Without perception, sensory inputs would simply be meaningless signals.

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Explain what happens once visual signals reach the visual cortex. a. Some signals go to the temporal lobe, which detects 鈥渨here鈥� information, and other signals go to the parietal lobe, which detects 鈥渨here鈥� and 鈥渨hat鈥� signals. b. Some signals go to the parietal lobe, which detects 鈥渨here鈥� information, and other signals go to the temporal lobe, which detects 鈥渨hat鈥� signals. c. Some signals go to the parietal lobe, which detects 鈥渨here鈥� and 鈥渨hat鈥� information and other signals go to the temporal lobe, which also detects 鈥渨here鈥� and 鈥渨hat鈥� signals. d. Some signals go to the parietal lobe, which detects 鈥渨here鈥� information, and other signals go to the temporal lobe, which detects 鈥渨here鈥� and 鈥渨hat鈥� signals.
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