What is Brain imaging techniques in IB Psychology?

Brain imaging techniques is a key topic in IB Psychology covering core concepts, theories, and research relevant to the IB Psychology syllabus, examined in Paper 1 and Paper 2.

How is Brain imaging techniques assessed in IB Psychology?

Brain imaging techniques is assessed in Paper 1 Section A and B and may appear in Paper 2. Understanding the mark scheme is essential for scoring full marks.

How do I write a high-scoring answer on Brain imaging techniques?

A high-scoring answer requires a clear command term response, relevant theory with supporting evidence, critical evaluation, and a conclusion.

IB Psychology Brain imaging techniques Notes

Study Notes

Mark Scheme

SECTION A MARK SCHEME (4 marks) Must Include: • BOLD signal / blood oxygen level dependent • Oxygen consumption linked to blood flow • Real-time functional activity measurement • fMRI vs MRI distinction (structural vs functional) • Named brain region + specific behaviour • Neural correlate (brain structure ↔ function)

Link Formula: "This reveals the neural correlate of [behaviour], showing how [brain region] is responsible for [function]."

Watch Out: Don't confuse fMRI (functional, shows activity) with MRI (structural, shows anatomy). Avoid vague phrases like "the brain shows activity"—specify the region and behaviour.

SECTION B MARK SCHEME (6 marks) 0 marks: No relevant psychological knowledge. 1–2 marks: Basic knowledge of brain imaging; limited or no application to scenario; minimal use of terminology. 3–4 marks: Accurate description of fMRI/BOLD mechanism; some application to scenario; partial explicit link. 5–6 marks: Precise definition with BOLD signal and mechanism; clear application to the specific scenario (e.g., comparing brain activity in hub vs library); explicit link between neural activation and the observed behaviour change; correct psychological terminology throughout.

Why Full Marks

Precise definition with BOLD signal and oxygen-consumption mechanism; fMRI vs. MRI distinction; amygdala example explicitly linked to threat-related emotional processing; "neural correlates" closes with appropriate biological approach framing.

Section A detailed feedback: • Excellent, precise definition: BOLD signal, functional vs. structural distinction, real-time observation — all key terms present • Mechanism broken down clearly (oxygen consumption → blood flow increase → neural activity mapping) • Example (amygdala + threatening stimuli) is highly relevant and explicitly linked to the concept • Academic, non-definitive language throughout ("suggests," "typically observe") Minor note: The phrase "fight or flight response" is slightly informal — "threat-related emotional processing" would be more precise. But this does not cost marks.

Model Answer

High-Scoring Sample

Section A Sample Answer

Brain imaging techniques are essential tools used to investigate the relationship between biological factors and behavior. Functional Magnetic Resonance Imaging (fMRI) is a dynamic, non-invasive technique that measures brain activity by detecting changes in blood flow, known as the Blood Oxygen Level Dependent (BOLD) signal. When a specific brain region is active, it consumes more oxygen; to meet this demand, blood flow increases to that area. This allows researchers to observe which parts of the brain are involved in specific cognitive processes in real-time. Unlike a standard MRI, which provides a static image of anatomy, fMRI maps functional activity, allowing for a correlation to be established between neural firing and specific behaviors.

An example of fMRI use is the investigation of the amygdala's association with threat-related emotional processing. When participants are shown threatening stimuli while in an fMRI scanner, researchers typically observe a significant increase in blood flow to the amygdala. This suggests the amygdala is a localized region associated with the human "fight or flight" response and the processing of emotional stimuli. This demonstrates how fMRI allows researchers to investigate the relationship between brain activity and emotional responses, supporting the biological approach's goal of mapping behavior to specific neural correlates.

Section B Sample Answer

Brain imaging techniques, such as MRI or fMRI, allow researchers to non-invasively observe the structure and function of the brain. fMRI (functional Magnetic Resonance Imaging) measures blood oxygen level-dependent (BOLD) signals to map neural activity in real-time. In this scenario, researchers would use fMRI to compare brain activity when students solve problems in the hub versus a library. Higher BOLD signals in the prefrontal cortex would suggest greater neural activation associated with executive functions, which explains the 20% speed increase. This demonstrates the value of brain imaging because it allows researchers to operationalize cognitive changes as measurable neural activity, providing biological evidence for the workspace's effect.