Features of the environment matter too: In one experiment, volunteers with a cold rod placed on the back of their hand reported feeling more pain when they were shown a red light than a blue one, even though the rod was the same temperature each time.
Aspek-aspek lingkungan juga penting: Dalam satu eksperimen, sukarelawan dengan tongkat dingin di punggung tangan mereka mengatakan merasa sakit lebih kuat saat melihat cahaya merah daripada biru, meski masing-masing tongkat bersuhu sama.