Higher Tier: evidence about brain function
| English | 中文 | Pinyin · 拼音 |
|---|---|---|
| electrical stimulation/ɪˈlektrɪkl ˌstɪmjʊˈleɪʃn/ | 电刺激 | diàn cì jī |
| MRI scanning/ˌem ɑː ˈaɪ ˈskænɪŋ/ | 磁共振成像 | cí gòng zhèn chéng xiàng |
What would explain this observation?
- Higher Tier: A scan can show a pattern related to a task, but a correlation is not automatically proof that one region alone causes the whole behaviour.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Neuroscientists map brain regions using evidence from patients with brain damage, electrical stimulation 电刺激 of particular areas and MRI scanning 磁共振成像. Damage associated with a lost function provides evidence about a region’s role. Stimulation can produce a response, and scanning can supply structural or task-related information interpreted using the stated technique.
- MRI scanning: A scanning technique used to obtain information about brain structure or function; electrical stimulation: Applying an electrical stimulus to investigate a response under regulated conditions.
Why can identifying brain function be difficult?
The brain is complex and delicate. Regions are interconnected, damage may affect more than one pathway and invasive procedures can cause harm. Evaluating a procedure weighs the expected information or treatment benefit against risks, uncertainty and ethical constraints. Agreement between different kinds of evidence can strengthen a conclusion without eliminating every limitation.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- The brain is complex and delicate. Regions are interconnected, damage may affect more than one pathway and invasive procedures can cause harm. Evaluating a procedure weighs the expected information or treatment benefit against risks, uncertainty and ethical constraints. Agreement between different kinds of evidence can strengthen a conclusion without eliminating every limitation.
- Compare supplied fictional case summaries, a stimulation map and a described scan result. State what each actually measures and distinguish association from direct intervention. Real procedures require professional oversight and appropriate consent. The school task is evidence analysis, never an instruction to stimulate brains, imitate a clinical scan or provoke damage.
Which two habits make the investigation or model in this case more defensible?
Compare supplied fictional case summaries, a stimulation map and a described scan result. State what each actually measures and distinguish association from direct intervention. Real procedures require professional oversight and appropriate consent. The school task is evidence analysis, never an instruction to stimulate brains, imitate a clinical scan or provoke damage.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a fictional evidence set reports a stated response in 18 of 24 recorded stimulation cases, or 75%. Six cases differ. The proportion summarizes those records but does not prove a universal region–function relationship; location, procedure, patient differences and the definition of a response need review.
A fictional evidence set reports a response in 21 of 28 cases. Calculate the percentage. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
A fictional evidence set reports a response in 21 of 28 cases. Calculate the percentage.
The result is 75 %. Known: a fictional evidence set reports a stated response in 18 of 24 recorded stimulation cases, or 75%. Six cases differ. The proportion summarizes those records but does not prove a universal region–function relationship; location, procedure, patient differences and the definition of a response need review.
Check the conclusion and its limits
- MRI is a technique rather than a single universal readout of every thought. A damaged region may affect connected systems, so a lost function cannot always be localized to one isolated cell group. Higher Tier evaluation must give a specific benefit and risk rather than a generic claim that technology is good.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
One scan alone always proves a region is the only cause of a behaviour. This claim is false: MRI is a technique rather than a single universal readout of every thought. A damaged region may affect connected systems, so a lost function cannot always be localized to one isolated cell group. Higher Tier evaluation must give a specific benefit and risk rather than a generic claim that technology is good.
Higher Tier: evidence about brain function: The brain is complex and delicate. Regions are interconnected, damage may affect more than one pathway and invasive procedures can cause harm. Evaluating a procedure weighs the expected information or treatment benefit against risks, uncertainty and ethical constraints. Agreement between different kinds of evidence can strengthen a conclusion without eliminating every limitation.
One scan alone always proves a region is the only cause of a behaviour.
MRI is a technique rather than a single universal readout of every thought. A damaged region may affect connected systems, so a lost function cannot always be localized to one isolated cell group. Higher Tier evaluation must give a specific benefit and risk rather than a generic claim that technology is good.
A scanning technique used to obtain information about brain structure or function: write the technical term.
MRI scanning means A scanning technique used to obtain information about brain structure or function.