PastPaper.question 1 · Short Answer Question
9 PastPaper.marksExplain how neuroplasticity occurs in the human brain, making reference to one relevant study.
PastPaper.showAnswersPastPaper.hideAnswers
PastPaper.workedSolution
### Theoretical Framework
Neuroplasticity refers to the brain's ability to alter its own structure and function in response to environmental demands, learning, or post-injury adaptation. This process occurs throughout the lifespan and is driven by mechanisms such as:
- **Dendritic branching (synaptogenesis):** The formation of new synaptic connections as a result of learning and environmental stimulation.
- **Synaptic pruning:** The elimination of unused synaptic connections to increase the efficiency of active neural networks.
### Supporting Study: Maguire et al. (2000)
- **Aim:** To investigate whether structural changes in the brain (specifically the hippocampus) could be detected in people with extensive experience of spatial navigation.
- **Participants:** 16 right-handed male London taxi drivers (who had completed 'The Knowledge' training) compared to 50 right-handed male non-taxi drivers (control group).
- **Method:** Quasi-experiment using MRI scans to measure the volume of grey matter in the hippocampus.
- **Results:** Taxi drivers had significantly increased grey matter volume in the posterior hippocampus compared to the control group. Conversely, the control group had greater volume in the anterior hippocampus. Furthermore, there was a positive correlation between the time spent as a taxi driver and the volume of the posterior hippocampus.
- **Conclusion:** The demands of memorizing London's complex layout led to structural reorganization of the hippocampus, demonstrating neuroplasticity in response to intensive spatial navigation experience.
Neuroplasticity refers to the brain's ability to alter its own structure and function in response to environmental demands, learning, or post-injury adaptation. This process occurs throughout the lifespan and is driven by mechanisms such as:
- **Dendritic branching (synaptogenesis):** The formation of new synaptic connections as a result of learning and environmental stimulation.
- **Synaptic pruning:** The elimination of unused synaptic connections to increase the efficiency of active neural networks.
### Supporting Study: Maguire et al. (2000)
- **Aim:** To investigate whether structural changes in the brain (specifically the hippocampus) could be detected in people with extensive experience of spatial navigation.
- **Participants:** 16 right-handed male London taxi drivers (who had completed 'The Knowledge' training) compared to 50 right-handed male non-taxi drivers (control group).
- **Method:** Quasi-experiment using MRI scans to measure the volume of grey matter in the hippocampus.
- **Results:** Taxi drivers had significantly increased grey matter volume in the posterior hippocampus compared to the control group. Conversely, the control group had greater volume in the anterior hippocampus. Furthermore, there was a positive correlation between the time spent as a taxi driver and the volume of the posterior hippocampus.
- **Conclusion:** The demands of memorizing London's complex layout led to structural reorganization of the hippocampus, demonstrating neuroplasticity in response to intensive spatial navigation experience.
PastPaper.markingScheme
Award marks based on the following IB-style SAQ criteria:
**7–9 marks:** The response is focused, showing accurate and detailed knowledge of neuroplasticity (e.g., dendritic branching, synaptogenesis). A relevant study (e.g., Maguire et al., 2000) is accurately described with clear details regarding its aim, method, results, and conclusion. There is an explicit, well-developed link explaining how the findings of the study demonstrate neuroplasticity.
**4–6 marks:** The response shows basic knowledge of neuroplasticity, but key terminology may be missing or limited. A study is described, but details may be incomplete or contain minor inaccuracies. The link between the study and the concept of neuroplasticity is present but superficial.
**1–3 marks:** The response is disorganized or lacks focus. Knowledge of neuroplasticity is minimal or incorrect. The study is either missing, highly inaccurate, or not linked to the concept.
*Note: If no study is mentioned, a maximum of 3 marks can be awarded.*
**7–9 marks:** The response is focused, showing accurate and detailed knowledge of neuroplasticity (e.g., dendritic branching, synaptogenesis). A relevant study (e.g., Maguire et al., 2000) is accurately described with clear details regarding its aim, method, results, and conclusion. There is an explicit, well-developed link explaining how the findings of the study demonstrate neuroplasticity.
**4–6 marks:** The response shows basic knowledge of neuroplasticity, but key terminology may be missing or limited. A study is described, but details may be incomplete or contain minor inaccuracies. The link between the study and the concept of neuroplasticity is present but superficial.
**1–3 marks:** The response is disorganized or lacks focus. Knowledge of neuroplasticity is minimal or incorrect. The study is either missing, highly inaccurate, or not linked to the concept.
*Note: If no study is mentioned, a maximum of 3 marks can be awarded.*