Adults 1 and 2 have no AD symptoms but adult 3 does. There is no significant difference in the ages of the patients. PET Tau images are in the upper row and PET amyloid are in the lower row.

Comparison between which 2 panels of the 3 patients' PET scans provides evidence against the ß-amyloid hypothesis.

Question

Adults 1 and 2 have no AD symptoms but adult 3 does. There is no significant difference in the ages of the patients. PET Tau images are in the upper row and PET amyloid are in the lower row.

Comparison between which 2 panels of the 3 patients' PET scans provides evidence  against the ß-amyloid hypothesis.

BlackTom AI · Accepted Answer

To tackle this question, I’ll evaluate what each pair of panels would imply about the relationship between tau, amyloid deposition, and AD symptoms, and how that bears on the beta-amyloid hypothesis.
Option: D and F
- Panel D shows amyloid PET signal in a patient with no AD symptoms (1) and relatively high signal in the amyloid axis. Panel F shows a tau PET signal pattern in the same or a different context. If D and F were the correct pair, one would need to infer that amyloid positivity (D) coincides with tau changes (F) or with symptoms in a way that supports a direct causal chain from amyloid to tau to symptoms. However, in the scenario, adults 1 and 2 have no AD symptoms despite amyloid signals, and adult 3 has symptoms with differing tau/amyloid patterns. This weakens a straightforward amyloid-causation narrative, making this pair less robust as evidence against the beta-amyloid hypothesis.
Option: C and F
- Panel C is a tau image (upper row) from an older adult with AD symptoms, while F is an amyloid image (lower row) perhaps showing a certain distribution. If you pair C (tau-rich with symptoms) and F (amyloid-rich), the association could be interpreted as tau changes aligning with symptoms rather than amyloid alone driving the disease. Yet, this pairing does not directly demonstrate a lack of association between amyloid and disease progression across all subjects, so it may not robustly counter the beta-amyloid hypothesis.
Option: D and E
- D (amyloid) and E (amyloid or tau interplay) would focus on one modality’s patterns across patients. If both panels emphasized amyloid, the comparison might not challenge the hypothesis that amyloid drives disease, because observing amyloid patterns without consistent symptom correlation would still fit some models of amyloid involvement. This pair likely fails to provide strong evidence against the beta-amyloid hypothesis.
Option: B and E
- B is a tau image from a cognitively normal older adult with no AD symptoms, and E is an amyloid image from the same or another patient. If B shows little tau despite amyloid positivity in E, that would suggest amyloid alone does not guarantee tau pathology or clinical symptoms, which could challenge a simple causal link from amyloid to disease. However, the question emphasizes comparing two panels across three patients to find evidence against the hypothesis; pairing B and E might offer some intuitive counterexample but may not be the clearest demonstration across the dataset provided.
Option: E and F
- E is a higher-contrast, more widespread signal on the amyloid axis across adults, and F is a tau or amyloid image showing the distribution in a patient with symptoms. Notably, the data description states adults 1 and 2 have no AD symptoms, while adult 3 does, with PET Tau in the upper row and PET amyloid in the lower row. If we compare E (amyloid pattern) with F (tau pattern) and observe that amyloid deposition does not map neatly onto the presence or absence of symptoms across individuals, this discordance can be used to argue against a simple, direct causal role of beta-amyloid in causing AD symptoms. In other words, significant amyloid signal in asymptomatic individuals (1 and 2) alongside variable tau patterns and symptomatic status (3) challenges the notion that amyloid alone drives disease progression, aligning with evidence against the beta-amyloid hypothesis.
Overall assessment
- The pair that best illustrates a mismatch between amyloid deposition and clinical or tau-related progression across the three patients is E and F, as it foregrounds discordant patterns between amyloid burden and symptomatology, supporting counterpoints to a strictly amyloid-centric disease model. The other pairs either rely on more indirect inferences or do not highlight the cross-patient dissociation as clearly. Therefore, E and F provide the clearest evidence against a simple beta-amyloid causation framework.

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