PSYCH 3313 Lecture Notes - Lecture 20: Circadian Rhythm, Pineal Gland, Melanopsin
22 Oct 2016
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Lecture: october 26: circannual; circadian; ultradian; infradian, behaviors that occur at regular intervals in response to internal, biological clocks, biological rhythms, multiple rhythms can be expressed within a single system e. g. , lh. Circadian rhythms serum levels: any rhythmic change that continues at close to a 24-hour cycle in the absence of. Light and the internal clock melanopsin (blue light: oscillations of protein production and degradation. Activity without cues: free running: no environmental cues (e. g. , light, approximately 25-hour rhythm; sleep onset slightly later each day. Neural basis of the biological clock: retinohypothalamic pathway, non-image receptor cells use melanopsin, carries light info, suprachiasmatic nucleus (scn, internal pacemaker, pineal gland, releases melatonin. Individual variations in sleep patterns: two separate groups of circadian rhythm neurons in scn, m-cells = control morning activity and need light for entrainment, e-cells = control evening activity and need darkness for entrainment, larks vs. owls .
