I just tried a few control experiments with the same exact protocol but changing the question to “Which sentence do you prefer?” and I get chance accuracy. So this should address the concern you mention. About how the injection strength affects localization: accuracy starts at chance level and increases with injection strength until it reaches a maximal value before dropping at higher strengths. On which concepts are easier to localize, my expectation is that it shouldn’t matter much although I haven’t tried systematically, but for example I would expect random vectors to work similarly.
I just tried a few control experiments with the same exact protocol but changing the question to “Which sentence do you prefer?” and I get chance accuracy. So this should address the concern you mention. About how the injection strength affects localization: accuracy starts at chance level and increases with injection strength until it reaches a maximal value before dropping at higher strengths. On which concepts are easier to localize, my expectation is that it shouldn’t matter much although I haven’t tried systematically, but for example I would expect random vectors to work similarly.