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Investigation 1: PostLab
PostLab Overview
The purpose of this PostLab is to help you move from physical observation of the brain to a conceptual understanding of cognition as a system.
During the Lab, you interacted directly with brain structures and observed differences in size, shape, and organization. The PostLab does not introduce new content. Instead, it will help you bring together what you have already observed and begin thinking about how the brain processes information.
As you work through the PostLab, keep these important ideas in mind:
- The brain functions as an integrated system, not as a collection of isolated parts.
- Physical structure places constraints and possibilities on mental processes.
- Information must move through the brain in an organized and coordinated way to produce learning and behavior.
- Understanding cognition requires looking at relationships among brain regions, not simply identifying their locations.
As you think:
Remember that observing the physical structure of the brain provides important evidence, but structure alone does not explain how cognition works. Consider how different brain regions must communicate and work together, and think about what questions about learning, attention, and thought remain unanswered.
Focus Questions
1. How does studying brain structure help us understand human behavior and decision-making?
Studying brain structure allows scientists to link specific regions of the brain to particular functions and behaviors. Different areas of the brain are responsible for tasks such as movement, sensation, emotion, and decision-making. When a specific region is damaged or altered, changes in behavior often follow, helping researchers infer the role of that region. Understanding brain structure therefore provides insight into how physical systems support thought, personality, and action.
Ideas to Consider:
- What kinds of behaviors or abilities are associated with different regions of the brain?
- What can changes in behavior after brain damage tell scientists about the function of a particular region?
- Why is the relationship between brain structure and behavior useful evidence for understanding cognition?
- Does identifying a brain region responsible for a function completely explain how that behavior occurs? Why or why not?
2. What did the case of Phineas Gage reveal about the role of the frontal lobes?
The case of Phineas Gage demonstrated that damage to the frontal lobes can dramatically alter personality, judgment, and social behavior without eliminating basic intelligence or memory. After his injury, Gage retained many physical and cognitive abilities but showed profound changes in self-control and decision-making. This provided early evidence that the frontal lobes play a critical role in executive functions such as planning, impulse control, and moral reasoning.
Ideas to Consider:
- What changed about Phineas Gage after his brain injury?
- What abilities remained relatively unchanged?
- Which part of his brain was damaged?
- What does the contrast between what changed and what remained the same suggest about the functions of the frontal lobes?
3. Why is it important to divide the brain into regions such as the frontal, parietal, temporal, and occipital lobes?
Dividing the brain into regions helps scientists and doctors describe, study, and diagnose brain function more precisely. Each lobe is associated with dominant functions—such as vision, sensation, language, or planning—allowing clearer interpretation of injuries, diseases, and imaging data. This organizational framework makes the complex brain easier to understand and communicate about scientifically.
Ideas to Consider:
- How does naming different brain regions help scientists describe where particular functions occur?
- Why might doctors need to identify the specific region of the brain affected by an injury or disease?
- How can dividing the brain into regions make a complex organ easier to study and communicate about?
- Does dividing the brain into regions mean that each region works independently? Why or why not?
4. How do neurons communicate information within the brain?
Neurons communicate using electrical signals within the cell and chemical signals between cells. An electrical impulse travels down a neuron’s axon, triggering the release of neurotransmitters at the synapse. These chemicals cross the synaptic gap and bind to receptors on the next neuron, continuing the signal. This process allows information to move rapidly and precisely through neural networks.
Ideas to Consider:
- What kind of signal travels within a neuron?
- What happens when that signal reaches the end of the neuron?
- How does information cross the synapse from one neuron to another?
- What might happen to communication in the brain if this signaling process is interrupted?
5. Based on your lab experience, does your understanding of brain anatomy explain how information is processed and how cognition actually works? Why or why not?
Your lab experience showed you that the brain is a physical system made up of organized structures. But seeing those structures does not, by itself, explain how information is processed or how cognition occurs.
Examining a sheep brain and using the brain cap gave you evidence about brain structure and organization, but they also left important questions unanswered. How does information move through the brain? How is it transformed? How do learning, memory, attention, and meaning emerge from the activity of the brain?
Recognizing the difference between what you can observe directly and what still needs to be explained is an important part of scientific reasoning.
Ideas to Consider:
- What did the sheep brain dissection and brain cap activity allow you to observe directly?
- What can brain anatomy tell you about where structures are located and how the brain is organized?
- What can anatomy not show you about how information moves through the brain?
- Why might understanding cognition require more than simply identifying brain structures?
- What new questions about learning, memory, attention, or information processing did the lab raise for you?
Reference Diagram: Human Brain Structures
Think Critically:
Now that you have examined the brain’s structures and considered how those structures relate to function, use the questions below to think more deeply about what your observations can—and cannot—explain. Draw on evidence from the lab, connect ideas from throughout this Investigation, and be prepared to explain the reasoning behind your conclusions.
1. Imagine a person could see and label all the major parts of the brain. Would that automatically mean they understand how thinking works? Why or why not?
Ideas to Consider:
- What can identifying the location of a brain structure tell you?
- What can it not tell you about how that structure processes information?
- Does knowing the parts of a system necessarily explain how those parts interact?
- What else would you need to understand in order to explain how thinking occurs?
2. During the lab, you examined a sheep brain and used the brain cap. How did these activities help you understand what brain structure can — and cannot — tell you about cognition?
Ideas to Consider:
- What brain structures were you able to observe or identify during the lab?
- What did the sheep brain allow you to observe that a diagram or model could not?
- How did the brain cap help you understand the location and organization of different brain regions?
- Could either activity show you information actually being processed in the brain? Why or why not?
- What questions about thinking or cognition remained unanswered after completing these activities?
3. Why is it more accurate to describe cognition as a coordinated system rather than a single brain “location”?
Ideas to Consider:
- How many different processes might be involved in something as seemingly simple as answering a question?
- How might attention, perception, memory, interpretation, and response work together?
- If different brain regions have specialized functions, why must they still communicate with one another?
- What might happen to the whole system if communication among brain regions is disrupted?
- Why might thinking be better understood as the result of relationships among brain regions rather than the activity of one isolated location?
4. What kinds of questions about cognition remain unanswered after studying anatomy—and what would we need next to answer them?
Ideas to Consider:
- What can studying anatomy tell you about the brain, and what remains invisible?
- How might you investigate the way information moves through and is processed by the brain?
- What kinds of experiments could help you study processes such as attention, learning, and memory?
- How could a model help explain processes that cannot be observed simply by looking at brain anatomy?
- How can an unanswered question become the starting point for a new scientific Investigation?
Synthesis: Bringing It All Together
How did examining real brain structures during the lab help you understand both the importance and the limits of brain anatomy in explaining cognition? What kinds of questions about thinking and learning remain unanswered?