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Perception Of Time


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A presentation on the various dimensions of the human perception of time, covering the psychological, biological and genetic basis.

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Perception Of Time

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  7. 10. TIME Perception of Surabhi Gupta
  8. 11. It is not the river that flows but the water. Not the years that go by, but ourselves. - Hevré Bazin
  9. 12. Perception of Time: outline <ul><li>Sense of time is non-linear; it is three dimensional: </li></ul><ul><ul><ul><li>Psychological </li></ul></ul></ul><ul><ul><ul><li>Genetic </li></ul></ul></ul><ul><ul><ul><li>Biological </li></ul></ul></ul><ul><li>Applications of Research in this area </li></ul><ul><li>Transcending Death! </li></ul>
  10. 13. 205 days in an underground cave <ul><li>In 1972, under observation of NASA scientists, Michael Siffre went underground (literally). </li></ul><ul><li>‘ What happens if nothing happens?’ </li></ul><ul><li>He spent most time sitting in the dark </li></ul>
  11. 14. The counter in our psyche <ul><li>In his ‘mind’, time had slowed down </li></ul><ul><li>Reports indicate: </li></ul><ul><ul><ul><li>His day lasted for 24.5 hours </li></ul></ul></ul><ul><ul><ul><li>16 were spent awake </li></ul></ul></ul>
  12. 15. Suprachiasmic nucleus (SN) <ul><li>‘ above’ [optic] ‘chiasma’ in the hypothalamus </li></ul><ul><li>Circadian Clock </li></ul><ul><li>Synchronizes to cues called zitetegabers. </li></ul><ul><li>Neural path is the Retinohypothalamic Tract </li></ul>
  13. 16. Where did it go? Time is motion <ul><li>Psychological time is derived from intervals between events </li></ul><ul><li>Muscle synchronization by basal ganglia </li></ul><ul><li>In Japanese Tea ceremony every detail of tea-making is prolonged & becomes an event in itself. </li></ul>
  14. 17. Time is relative <ul><li>&quot;Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. THAT'S relativity.&quot; </li></ul><ul><li>- Einstein </li></ul>
  15. 18. Tick-Tock genes <ul><li>Experiment with Euglena </li></ul><ul><li>Four genes activate and </li></ul><ul><li>deactivate in a 24-hr cycle </li></ul><ul><li>Cell division and metabolism also coordinated with the circadian pacemaker. </li></ul>
  16. 19. Biological time <ul><li>Pineal gland controls sleep and waking rhythms </li></ul><ul><li>It releases the hormone, melatonin to regulate cycles at the tissue level </li></ul><ul><li>Neurotransmitters like beta-endorphin and serotonin influence perception of time </li></ul>
  17. 20. The Dracula hormone <ul><li>Melatonin production: </li></ul><ul><ul><ul><li>Inhibited by light </li></ul></ul></ul><ul><ul><ul><li>Stimulated by darkness </li></ul></ul></ul><ul><li>Triggers seasonal breeding in animals </li></ul><ul><li>In humans, helps set the biological clock </li></ul><ul><ul><li>A small dose of melatonin </li></ul></ul><ul><ul><ul><li>Given in morning : delays the clock </li></ul></ul></ul><ul><ul><ul><li>Given in afternoon/evening : advances the clock </li></ul></ul></ul>
  18. 21. (En)lightening knee <ul><li>Biological rhythm markers: </li></ul><ul><ul><ul><li>Body core temperature </li></ul></ul></ul><ul><ul><ul><li>Rise in melatonin </li></ul></ul></ul><ul><li>Light shown on the back of knee advanced biological clock by up to 3 hours </li></ul>
  19. 22. Applications <ul><li>Knee straps to fight jetlag </li></ul><ul><li>Timed drugs </li></ul><ul><li>Melanin and Vitamin B2 used to treat </li></ul><ul><ul><ul><li>Sleep disorders </li></ul></ul></ul><ul><ul><ul><li>Seasonal depression </li></ul></ul></ul><ul><ul><ul><li>Jetlag </li></ul></ul></ul><ul><li>Why is asthma is the most severe at night? </li></ul>
  20. 23. Transcending death <ul><li>Suprachiasmic is Supra-charismatic </li></ul><ul><li>After death, the suprachiasmc nucleus continues to emit pulses </li></ul><ul><li>The departed self pays a last, gracious tribute to the fascinating enigma, time . </li></ul>