Module 1.6d Sensation: Skin, Chemical, and Body Senses and Sensory Interaction

Touch Sensations

  • Basic touch sensations: pressure, warmth, cold, pain.

  • Touch promotes well-being; critical for infant development.

  • Sensitive spots on the skin detect pressure, warmth, cold, pain; interactions create other sensations (e.g., itching).

Pain

Biopsychosocial Approach to Pain:

  • Biological Influences: Pain signals via nociceptors; genetic differences impact sensitivity, with women typically being more sensitive.

  • Psychological Influences: Focus and attention on pain (e.g., athletes vs. general public); cognitive editing of pain memories (duration vs. peak)

  • Social-Cultural Influences: Social context affects pain perception (greater empathy leads to more pain perception); cultural norms shape the experience.

Control Mechanisms:

  • Pain as a signal for harmful conditions (e.g., leaving an injury alone).

  • Techniques for pain control: medications, physical therapy, psychological methods, distraction, and placebos.

  • Gate-Control Theory: Spinal cord acts as a gate for pain signals, influenced by competing signals from larger fibers.

Taste and Smell

Taste (Gustation):

  • Basic tastes: sweet, sour, salty, bitter, umami (MSG), oleogustus (fat).

  • Taste is influenced by biological and cultural factors; preference develops through exposure.

  • Taste and smell are chemical senses; taste receptors in taste buds transmit information to the brain.

Smell (Olfaction):

  • Olfactory receptors respond to odor molecules; relay signals to the brain bypassing the thalamus.

  • Smell closely linked to memory and emotion; olfactory signals can evoke emotional experiences.

Kinesthesis and Body Position

  • Kinesthetic sense helps identify body part positions/movements through proprioceptors.

  • Vestibular sense governs balance, using fluid movement within inner ear structures.

  • Integration of senses assists in detecting movement; more challenging without visual guidance.

Sensory Interaction and Embodied Cognition

  • Sensory systems influence each other (e.g., taste relies on smell).

  • Sensory interaction affects perception (e.g., visual cues aiding auditory understanding).

  • Embodied Cognition: Body sensations and states influence cognitive preferences/judgments (e.g., hard chairs equating to harsher judgments).

  • Synesthesia: Condition where stimulation of one sense triggers experiences in another.