Question at position 19 You hypothesize that amygdala activation is necessary for male aggression in mice. Which research method can be used to test your hypothesis?OptogeneticsEEGDiffusion tensor imagingMRIClear my selectionSingle choice
A
Optogenetics
B
EEG
C
Diffusion tensor imaging
D
MRI

Question

Question at position 19 You hypothesize that amygdala activation is necessary for male aggression in mice. Which research method can be used to test your hypothesis?OptogeneticsEEGDiffusion tensor imagingMRIClear my selectionSingle choice

A

Optogenetics

B

EEG

C

Diffusion tensor imaging

D

MRI

BlackTom AI · Accepted Answer

Optogenetics enables precise, cell-type–specific control of neuronal activity with millisecond temporal resolution, so it can test whether amygdala activation is necessary for male aggression in mice.

Relevant knowledge points and concepts:
- Necessity vs. correlation: To show a brain region is necessary for a behavior you must causally disrupt its activity and observe loss or reduction of the behavior. Correlational measures (e.g., fMRI, EEG) only show association.
- Optogenetics: uses genetically targeted light-sensitive ion channels (e.g., channelrhodopsin for activation, halorhodopsin/Arch for inhibition) expressed in specific neurons, with optical fibers delivering light to the amygdala to turn neurons on or off with high temporal precision.
- Behavioral assay: standardized aggression tests (resident-intruder assay) quantify aggressive actions under controlled conditions.

Step-by-step reasoning / experimental outline:
1. Choose a genetic targeting strategy to express an inhibitory opsin (e.g., halorhodopsin) selectively in amygdala neurons implicated in aggression (using Cre-driver lines or viral vectors).
2. Implant optical fibers above the targeted amygdala subregion.
3. Establish baseline aggression levels in resident-intruder tests with light off.
4. During subsequent trials, deliver inhibitory light to transiently silence amygdala neurons during the aggression test; compare aggression metrics (latency to first attack, number/duration of attacks) between light-off and light-on conditions.
5. Statistical analysis: if transient inhibition significantly reduces aggressive behavior relative to baseline or control animals, this supports that amygdala activation is necessary for male aggression. Complementary experiments could activate neurons to test sufficiency.

Why optogenetics is correct:
- It provides causal, reversible, temporally precise manipulation of the amygdala, directly testing necessity (silencing) and sufficiency (activation).

Why other options are incorrect:
- EEG measures scalp electrical activity with poor spatial resolution and cannot selectively inhibit amygdala neurons or demonstrate necessity.
- Diffusion tensor imaging maps white-matter tracts (structural connectivity), not current activity nor causal function; it cannot test necessity.
- MRI (fMRI) measures hemodynamic correlates of activity and is correlational with low temporal precision; it cannot selectively and reversibly manipulate the amygdala to establish necessity.

Conclusion: Optogenetics is the appropriate method to test whether amygdala activation is necessary for male aggression in mice. This matches the provided correct answer: Optogenetics.

Question at position 19 You hypothesize that amygdala activation is necessary for male aggression in mice. Which research method can be used to test your hypothesis?OptogeneticsEEGDiffusion tensor imagingMRIClear my selectionSingle choice

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