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Neurobiologist: In a recent experiment, macaques performing tasks that required balancing potential risks against potential rewards exhibited elevated activity in the anterior cingulate cortex (ACC). When administered a targeted pharmacological agent that temporarily suppressed ACC activity, these macaques consistently chose low-risk, low-reward options, whereas a control group maintained a preference for high-risk, high-reward options. Thus, elevated ACC activity is a necessary neurobiological condition for macaques to favorably assess high-risk alternatives.

Which one of the following, if true, most strongly supports the neurobiologist's argument?

  1. A
    The pharmacological agent used to suppress ACC activity is known to also dull the macaques' overall appetite for the food rewards utilized in the experiment.
  2. B
    In mammalian brains, the anterior cingulate cortex is typically activated during tasks that require sustained focus, regardless of the presence of risk.
  3. When presented with choices that carried identical, minimal risks, macaques administered the pharmacological agent demonstrated the same strong preference for high-reward options as the control group.Answer
  4. D
    Subsequent scans revealed that the pharmacological agent did not completely eliminate ACC activity in the experimental group, but merely reduced it to resting baseline levels.
  5. E
    Artificially stimulating the ACC in macaques that inherently avoid risk is sufficient to reliably induce them to consistently select high-risk, high-reward options.

Answer

When presented with choices that carried identical, minimal risks, macaques administered the pharmacological agent demonstrated the same strong preference for high-reward options as the control group.
The neurobiologist concludes that ACC activity is necessary specifically for the favorable assessment of high-risk alternatives. However, the experimental evidence only shows that suppressing the ACC stops macaques from choosing high-risk, high-reward options over low-risk, low-reward ones. A critical alternative explanation is that suppressing the ACC simply diminishes their desire for high rewards (making them not care enough to try). The correct answer eliminates this alternative explanation by demonstrating that when risk is held constant, the drug does not affect their strong preference for high rewards. By isolating the drug's effect to the risk variable, it strongly supports the causal connection drawn in the conclusion.

Step-by-Step Solution

1
Identify the conclusion of the argument.
Elevated ACC activity is necessary for macaques to favorably assess high-risk alternatives.
To know what specific claim needs to be strengthened.
2
Identify the premises supporting the conclusion.
Macaques making risk/reward choices have high ACC activity. Suppressing ACC activity causes them to abandon high-risk, high-reward options in favor of low-risk, low-reward ones.
To understand the causal evidence provided by the experiment.
3
Spot the potential gap or alternative explanation in the causal reasoning.
The pharmacological suppression might have caused the macaques to stop caring about the 'high-reward' aspect rather than specifically impairing their assessment of the 'high-risk' aspect.
Strengthen questions involving causal experiments often require eliminating prominent alternative explanations.
4
Evaluate the options to find one that eliminates this alternative explanation.
The correct option shows that when risk is equal and minimal, the drug-affected macaques still actively seek high rewards.
This isolates the drug's behavioral effect purely to the risk assessment, thereby directly strengthening the conclusion that ACC activity relates specifically to assessing risk.

Key Concept

Eliminating alternative explanations in causal reasoning
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