A Problem with Many physiological Measures of Attitude, Such as GSR

A problem with many physiological measures of attitude, such as GSR, EMG, and ERP is that they

A) cannot overcome social desirability bias or acquiescence bias
B) are bidirectional indicators, and may signal positive or negative reactions
C) can only measure negative attitudes or unfavorable reactions to things
D) can only measure positive attitudes, or favorable reactions to things

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