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CR3 - Reading Chapter 3 FOCUS attention on pp 67-89 Figs...

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Reading Chapter 3: FOCUS attention on – pp 67-89 – Figs. 3:1-6; 10-11, 13 (section) BOOK CORRECTION on Fig 3:10 – Advances and Delays are switched! Objectives Define/illustrate fundamental properties – Period, phase response curves (PRCs) Understand how entrainment occurs – From PRC to entrainment Advanced entrainment – T-cycles – “skeleton” photoperiods
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Subjective day and night ! = 24.2 h ! = 24.3 h "# = 1.0 h Subjective day Subjective night x $ = duration of active phase % = duration of rest phase Free-running period Precision Stability Systematic variation
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LD = light:dark cycle e.g., LD12:12 12L12D DD = constant dark LL = constant light FRP varies with light intensity -- BIRD Aschoff's Rule, an Empirical Generalization: _ DD < 24 h, nocturnal _ DD > 24 h, diurnal Diurnal, brighter light _ LL decreases Nocturnal, brighter light • _ LL increases
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Humans What is the FRP? Orten hear ! = 25 h Others say 24.2 - 24.6 Which is it? Phase shifts "# = -1.4 h L at CT 18.3 L at CT 15.4 "# "# = + 4.2 h
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Standardization of time Circadian Time Tied to subject’s own cycle Three days of rodent activity
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  • Winter '09
  • Brody
  • PRC, Circadian rhythm, Phase response curve, Circadian Time Tied, phase response curves, _LL decreases Nocturnal

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