Test your science knowledge
A three-pound blob of flesh is responsible for your entire worldview鈥攁nd not just how you see the world, but all your other senses and your responses to those senses, too. How is this possible? 黑料吃瓜资源鈥檚 cutting-edge research in perceptual science offers some answers that just might blow your mind.
How long, on average, does it take for the human brain to perceive and respond to visual stimuli?
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Fruit flies can respond to visual stimuli in less than five milliseconds. Our average reaction time is about 200 milliseconds鈥攊.e., one-fifth of a second. Interestingly, this is also about the amount of time that usually passes between verbal responses in a typical conversation.
Which of your senses is considered most closely related to smell?
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The olfactory (smell) and gustatory (taste) are located very close to one another in the brain. However, recent research suggests that the olfactory cortex may take sounds into account as well. Likewise, the brain鈥檚 auditory (hearing) cortex may receive smell signals.
What is the 鈥渃ocktail party effect鈥� in neuroscience?
Research has shown that a small minority of auditory neurons react strongly when exposed to any specific sound. This finding could help explain the brain鈥檚 ability to focus on a particular sensory stimulus, like one voice at a noisy party. Notably, people with hearing impairments, autism, or attention deficit hyperactivity disorder (ADHD) may struggle with this ability.
How many different smells can humans perceive?
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Scientists used to think humans could detect 10,000 odors. But we now know that humans can distinguish at least 1 trillion different smells. In fruit flies and mice, scientists have observed that some neurons respond unpredictably when exposed to similar scents. These 鈥�unreliable cells鈥� might help us learn to discern very similar odors, like the particular notes in a glass of wine.
The central amygdala is involved in which of the following brain activities?
This tiny, almond-shaped brain structure processes both pain and pleasure and helps us learn what to expect from a given stimulus. Furthermore, research suggests that certain neurons in the central amygdala don鈥檛 just respond differently to rewards versus punishments鈥攖hey also react differently to specific kinds of rewards or punishments, 鈥渁lmost like a sensory鈥� response.
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