PS215 Unit 4 Brain Structures Case Analysis Example

Reviewed by Romilly Dunmore, MEd Neuroscience Purdue University Global Free custom sample in 24 to 48h

A composite stroke involving the left inferior frontal gyrus, the lower motor strip and underlying white matter is mapped onto symptoms in this PS215 Unit 4 brain structures case analysis. Harold's halting speech without small words, intact comprehension, frustration at his errors, drooping right face and weak right hand follow from a damaged language and motor network, while spared posterior language areas and an intact right hemisphere explain what he could still do, including singing. Dronkers and colleagues' scans of Broca's own patients show why the network matters. Purdue Global PS 215, Neuroscience, assigns this analysis in the BS in Psychology course.

CoursePS215 Neuroscience
UnitUnit 4
Paper typeBrain structures case analysis
LengthAbout 510 words, 4 pages double-spaced
FormatAPA 7 student paper
SchoolPurdue University Global
ProgramBS in Psychology
UpdatedOctober 2026

Free sample paper for PS215 Unit 4

1

A Left Frontal Stroke, Read Structure by Structure: A PS215 Unit 4 Brain Structures Case Analysis

[Student Name]

Purdue University Global

PS215: Neuroscience

Unit 4 Brain Structures Case Analysis

[Instructor Name]

[Date]

The case and the imaging findings are composite; the research cited is real.

What this part is doingMapping symptoms to damaged and spared structures in the lead shows the analysis explains abilities as well as deficits.
2

The Case

Harold, a 66-year-old retired choir director, had an ischemic stroke after a clot lodged in one of the arteries feeding his left frontal lobe. Imaging showed damage in the left frontal lobe, including the inferior frontal gyrus and the adjacent lower part of the primary motor cortex, with some extension into underlying white matter. In the weeks after the stroke, he spoke in short, effortful phrases with many pauses, often leaving out small words such as the and is. He understood most conversation, recognized his errors and became frustrated by them. His right hand was weak and the right side of his face drooped. He could sing familiar hymns with clear words.

Language: Broca's Area and Beyond

The left inferior frontal gyrus, including Broca's area, is part of a network that supports the production of speech, especially grammar and the planning of articulation. Damage involving it typically produces nonfluent aphasia: halting speech with relatively preserved comprehension, as Harold showed. Yet the classic picture is too simple. Dronkers et al. (2007) scanned the preserved brains of Broca's original patients, and found damage extending well beyond the area that now bears his name, into deeper regions and white matter. Lasting nonfluent aphasia usually requires damage to that wider network, not to Broca's area alone.

Harold's symptoms come from damage to a language network, not to a single speech center.

Motor Cortex and the Right Side

The primary motor cortex runs as a strip in front of the central sulcus, with the face represented near the bottom and the hand above it. Because motor pathways cross to the opposite side of the body (Kalat, 2019), damage to the lower left motor strip explains weakness in Harold's right face and right hand. The location also explains why his speech was effortful at the level of articulation: the muscles of the lips and tongue are controlled from the same lower region.

What this part is doingUsing the motor map's layout to explain why face and hand were affected together shows structure explaining symptoms.
3

What Was Spared

Comprehension depends heavily on posterior temporal regions, including Wernicke's area, which Harold's stroke did not reach, so he understood speech well. The right hemisphere was intact. Singing familiar songs draws on both hemispheres, with right-hemisphere regions contributing to melody and rhythm, and overlearned lyrics may be retrieved as part of a melody rather than built word by word (Norton et al., 2009). That combination helps explain why he could sing words he could not speak.

Why the Analysis Matters

Knowing which structures were damaged and which were spared guides rehabilitation. Therapists can work toward speech through the intact melodic abilities and rely on Harold's good comprehension to give instructions. The structural picture also sets expectations: damage to a network, rather than to one spot, means recovery will depend on other regions taking on part of the work, the subject of the next unit.

What this part is doingEnding on what the structural picture means for recovery connects anatomy to the plasticity unit.
4

References

Dronkers, N. F., Plaisant, O., Iba-Zizen, M. T., & Cabanis, E. A. (2007). Paul Broca's historic cases: High resolution MR imaging of the brains of Leborgne and Lelong. Brain, 130(5), 1432-1441. https://doi.org/10.1093/brain/awm042

Kalat, J. W. (2019). Biological psychology (13th ed.). Cengage Learning.

Norton, A., Zipse, L., Marchina, S., & Schlaug, G. (2009). Melodic intonation therapy: Shared insights on how it is done and why it might help. Annals of the New York Academy of Sciences, 1169(1), 431-436. https://doi.org/10.1111/j.1749-6632.2009.04859.x

Reading the PS 215 Unit 4 instructions

Unit 4 of PS215 often asks you to explain which brain structures are involved in a case and how damage to them changes behavior. Describe the case concretely, including the location of the injury and the symptoms observed. Map each symptom onto a structure or network, explaining the function involved and why damage produces that pattern. Address what was spared and why abilities persisted, since that tests understanding as much as deficits do. Avoid the single-center view of function by acknowledging networks and recent research. Close with what the structural picture means for rehabilitation or prognosis. Cite a biological psychology text and at least one study, describing imaging or case evidence accurately and with appropriate caution.

How this PS215 Unit 4 example is built

The analysis lists the clot's location, the frontal and white matter damage and the symptoms, from omitted small words to the drooping face. A language section explains the inferior frontal gyrus and nonfluent aphasia, then Dronkers and colleagues' finding that Broca's patients had wider damage, under a highlighted line that the symptoms reflect a network. A motor section uses the crossed pathways and the layout of the motor strip, citing Kalat, to explain why face and hand were affected together and why articulation was effortful. A spared-abilities section covers comprehension, the right hemisphere and Norton and colleagues on singing. The close explains how the picture guides therapy and expectations.

Where the points sit in the PS215 Unit 4 rubric

Case analyses earn credit for precise mapping between injury, structure and symptom. Instructors look for each symptom linked to a function and a location, with crossed motor control and language lateralization explained correctly. Accounting for spared abilities shows deeper understanding than listing deficits alone. Acknowledging that functions depend on networks, with a study to support it, earns credit for current knowledge. A rehabilitation or prognosis section demonstrates application. Accurate anatomical terms used in plain sentences are valued over jargon. A biological psychology text and an imaging or case study, cited correctly, complete the analysis, and any figure should match the regions named in the text. Precision about which side and which lobe, more than vocabulary, is what instructors check first.

PS215 Unit 4 help: mistakes that cost points

The most frequent error labels Broca's area as the speech center and stops there. Another common slip puts right-sided weakness in the right hemisphere, missing that motor pathways cross. Students often describe symptoms without explaining why the damaged structure produces them. Spared abilities are usually ignored, though they often guide therapy. Some analyses lean on a single website diagram instead of a textbook or study. Before submitting, check that each symptom has a structure and a reason, that the side of the body matches the opposite hemisphere, that you have named at least one spared ability and its basis and that your conclusion says what the analysis means for recovery.

Get a PS215 Unit 4 example written to your instructions

Share the case and the instructions with the rubric. A custom analysis maps the injury onto structures, functions and symptoms. It arrives within 24-48h; first requests are free. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.

Request this unit free All PS215 units Finished samples

More PS215 papers and BS in Psychology samples

PS215 Unit 4 questions, answered

What is Broca's aphasia?

Difficulty producing fluent speech, often with relatively preserved comprehension, after damage involving the left frontal lobe.

Is Broca's area the speech center?

It is part of a larger language network; symptoms depend on how far damage extends.

Should the analysis include imaging?

Describing what imaging shows helps, but a structural explanation is the core.

Where can I find a free PS215 Unit 4 sample paper?

The full PS215 Unit 4 analysis is on this page, mapping a composite left frontal stroke onto speech, motor and spared abilities.

Why could Harold still understand speech in the PS215 Unit 4 sample?

His stroke spared the posterior temporal language areas that support comprehension, damaging mainly frontal regions for producing speech.