Ravi works in a windowless studio. When the bright ceiling lamps switch on in the morning, light reaches his eyes. His retina sends information to the suprachiasmatic nucleus (SCN), which signals the pineal gland to reduce melatonin release, and his alertness rises.
Which event in this sequence is an exogenous zeitgeber?
Ravi's retina sends information to the SCN
The SCN signals Ravi's pineal gland
Melatonin release falls as Ravi's alertness rises
Light from the bright ceiling lamps reaches Ravi's eyes
53 exam-style questions on OCR GCSE Psychology 6.1 Key Concepts, covering 6.1.1 Functions, features and benefits of sleep, 6.1.2 Causes of sleep disorders, and 6.1.3 Endogenous pacemakers and exogenous zeitgebers. Each one has a worked solution and a mark scheme showing where the marks go.