“Psychophysiology”  

  Psychophysiology is the study of the physiological basis of our human behavior. *

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“Sensations (Sensory Functions)”  

Sensory Functions

  In and on our body, Sensations (Sensory Functions), aka Organoleptics are nervous system processes, supported by the sensory organ systems, in which specialized sensory receptor cells transduce peripheral stimuli (physical or chemical) into nerve impulses which get transmitted to the various sensory centers in the central nervous system.
  In and on our body, the Sensory Functions (Sensations) nervous system processes include; sense of hearing (audition), sense of sight (ocular vision), sense of pain (signals of pain), pleasure, proprioception, sense of smell, sense of taste, thermosensing, touch and gravity sensing. **

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“Sleep”  

  In our body, Sleep, as a readily reversible rhythmic body process, is a nervous system process with a recurring altered state of consciousness, caused by the suspension of sensorimotor interactions, accompanied by diminished motor activity, distinguished by a decreased ability to react to stimuli and the inactivity of most voluntary muscles.

The Role of Sleep

  Sleep plays an important role in increasing performance of newly learned activities, consolidating memories, and increasing brain plasticity by breaking and forming new synapses (neuron connections).

Sleep plays a critical role in the process of learning and memory-formation. The benefits of sleep go beyond the absence of stress from sleep-deprivation.
  Examples of sleep subsets, subjects, concepts, processes and related entities include:

• sleep-wake cycles
• somnogens

**

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“Psychological Stress (Emotional Stress & Mental Stress)”  

Mental Stress & Emotional Stress (Psychological Stress)

  In our body, Psychological Stress (Emotional Stress & Mental Stress) is a stress, wherein emotional factors predominate.

Psychological Stress

  In our body, Psychological Stress is a healthy necessary response that maintains in homeostasis upon exposure to environmental changes, when affected by a certain stressor, changes occur. These changes to this programmed response is known as a stress response.
  An unhealthy psychological stress is called a psychological stress disorder. **

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“Arousal”  

  In and for our body, Arousal is both a physiological and psychological state of being awake or reactive to stimuli.
  In our body, Arousal is a cortical vigilance or readiness of tone, presumed to be in response to sensory stimulation via the reticular activating system. Arousal involves the activation of the reticular activating system in the brain stem, the autonomic nervous system and the endocrine system, leading to increased heart rate and blood pressure and a condition of sensory alertness, mobility and readiness to respond.
  Arousal is a behavioral response that involve complex neurocircuitries and multiple neurochemical components.
Examples of arousal subsets, subjects, concepts, processes and related entities include:

• Cortical Vigilance
• attention
• sexual arousals
• wakefulness

**

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