Signal Detection Theory – Sensory Processing (PSY, BIO)

by Tarry Ahuja, MD

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    Now, let’s take a look at Signal Detection Theory and we’re going to look at what are some of the different things that impact signal detection. So what we’re talking about when we’re saying signal detection is detecting the presence of a stimulus if there are things going on. So we’ll walk through a lot f examples but first, let’s highlight these four factors. The first is alertness. How alert are you in terms of trying to identify the stimulus? So are you completely focused and alert saying, “I’m looking for a certain stimulus”? Okay. Are you expecting that? Is there some level of expectation? Or are you completely unaware of whether or not the stimulus is going to arrive? Okay. So think of getting slapped; knowing the slap is coming because you’ve just insulted your partner. And you know, here, she’s going to slap you. Let’s say she. She’s going to slap you when you tell her that you’ve decided to now date her sister. The slap is coming. So you’re expecting the slap. So you’re expecting the incoming stimulus versus you getting slap completely unannounced. You’re not ready for it. You aren’t really ready to detect that stimulus. Is there a motivation? Are you motivated to try and detect that stimulus? And experience. Have you ever experience this stimulus before? If there was a previous experience, then you might be tuned to and be behaviorally aware of what to expect. Okay? So look at the analogy of, let’s say, if you’re looking at your child, you’re a mother and your child is now missing, and you’re at a -- you’re at a carnival or a festival and your child has ran off. Now, you are looking for your child and you are completely in tuned to hearing their...

    About the Lecture

    The lecture Signal Detection Theory – Sensory Processing (PSY, BIO) by Tarry Ahuja, MD is from the course Sensing the Environment.

    Included Quiz Questions

    1. Depends on detection of the presence of a stimulus amid background noise.
    2. Doesn’t depend on psychological state.
    3. Doesn’t depend on previous experience with the stimulus.
    4. Depends on proportionate difference between stimuli.
    5. Depends on the linear relationship between actual and perceived stimulus intensity.
    1. Stimulus not detected when the stimulus is absent
    2. Stimulus detected when stimulus is present
    3. Stimulus not detected when stimulus is present
    4. Stimulus detected when stimulus is absent
    5. It is an active process
    1. …nociceptors.
    2. …rods.
    3. …olfactory receptors.
    4. …fungiform papillae.
    5. …cutaneous mechanoreceptors.

    Author of lecture Signal Detection Theory – Sensory Processing (PSY, BIO)

     Tarry Ahuja, MD

    Tarry Ahuja, MD

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