AQA Psychology - Biological Rhythms - Pacemakers & Zeitgebers Asks questions related to my notes with the same title. 2.5 / 5 based on 4 ratings ? AccountingA2/A-levelAll boards Created by: Rosie ThompsonCreated on: 19-05-12 21:22 What are internal biological clocks which regulate biological rhythms called? Endogenous pacemakers 1 of 4 How does phototherapy treat SAD? It uses a strong light which lowers the levels of melatonin. 2 of 4 The SCN signals the pineal gland to secrete more melatonin when... there is less light 3 of 4 In Siffre's 1975 cave study, he spent 179 days underground. How did his circadian rhythm change? It became slightly longer 4 of 4
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