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Review of Key Concepts and Terms

Sensation and Perception

  • Importance: Vital for understanding how external stimuli impact behaviors and mental processes.
  • Interaction: Links biological (anatomical structures) and cognitive perspectives (thought processes).
  • Definitions:
  • Sensation: Receiving physical energy and encoding it into neural signals.
  • Perception: Organizing and interpreting sensory information to recognize meaningful objects/events.

Gestalt Psychology

  • Overview: Founded in Germany (1912), emphasizes perceiving objects as positioned within organized wholes rather than separate parts.
  • Principles of Perceptual Organization:
  • Similarity: Objects that are similar are perceived as grouped together.
    • Example: Grouping colored circles into rows instead of seeing them as separate dots.
  • Pragnanz (Good Figure): Objects are perceived in the simplest form.
    • Example: Overlapping circles appear as a simple figure rather than complex lines.
  • Proximity: Objects near each other are perceived as one group.
  • Continuity: Lines are perceived as following the smoothest path.
  • Closure: Incomplete figures are perceived as complete.
  • Common Region: Items in a defined area are grouped together.

Depth Perception

  • Definition: Ability to perceive three dimensions, necessary for judging distance.
  • Visual Cliff Experiment: Demonstrated depth perception in infants.
  • Binocular Cues:
  • Retinal Disparity: The slightly different images from each eye are combined to perceive depth.
  • Convergence: Eyes angle inwards for near objects, providing a clue to distance.
  • Monocular Cues:
  • Linear Perspective: Parallel lines converge at a horizon's vanishing point.
  • Interposition: One object blocking another appears closer.
  • Relative Height: Objects higher in the visual field appear further away.

Motion Perception

  • Phi Phenomenon: Illusion of motion from sequentially blinking lights.
  • Relative Motion: Close objects seem to move faster than distant ones.

Perceptual Constancy

  • Definition: Perception of objects as unchanged despite varying conditions.
  • Types:
  • Color Constancy: The perceived color of objects remains consistent under varying light.
  • Size Constancy: Objects are perceived as the same size despite distance changes.
  • Shape Constancy: Perceived shape remains constant despite changes in viewpoint.

Information Processing Models

  • Top-Down Processing: Guided by higher-level mental processes; starts with the larger concept.
  • Bottom-Up Processing: Begins with sensory input; builds to a complete perception.

Sensory Transduction Principles

  • Transduction: Converting environmental stimuli into neural signals.
  • Absolute Threshold: Minimum stimulation required to detect a stimulus 50% of the time.
  • Difference Threshold (Just Noticeable Difference): Minimum difference required for detection 50% of the time.
  • Signal Detection Theory: Detection of a stimulus influenced by intensity and psychological state.
  • Sensory Adaptation: Decreased sensitivity due to constant stimulation.

Historical Figures in Sensation and Perception

  • Gustav Fechner: Founder of psychophysics, studied stimulus-response relationships.
  • David Hubel & Torsten Wiesel: Pioneered research on visual processing.
  • Ernst Weber: Developed Weber's Law relating to perception of stimulus differences.

Influence of Experience and Culture on Perception

  • Perceptual Set: Mental predisposition to perceive certain aspects and ignore others.
  • Context Effects: Environmental context affects how stimuli are perceived.
  • Cultural Differences: Different cultures may perceive stimuli (like size and backgrounds) in contrasting ways.

Attention and Behavior

  • Selective Attention: Focusing on relevant stimuli while ignoring irrelevant ones.
  • Examples: Cocktail Party Effect, Stroop Effect.
  • Inattentional Blindness: Failing to see visible objects due to attention being directed elsewhere.
  • Change Blindness: Not noticing changes in the environment when attention is diverted.

Auditory Sensation and Perception

  • Audition: Sense of hearing.
  • Basic Concepts:
  • Frequency: Determines pitch (highness/lowness).
  • Amplitude: Determines loudness.
  • Anatomy: Includes outer ear (pinna, auditory canal), middle ear (eardrum, ossicles), and inner ear (cochlea).
  • Theories of Hearing:
  • Place Theory: Links pitch to the cochlea's stimulation location.
  • Frequency Theory: The rate of nerve impulses corresponds to pitch.

Chemical Senses

  • Gustation: Sense of taste; five basic tastes (sweet, salty, sour, bitter, umami).
  • Olfaction: Sense of smell; does not pass through the thalamus; connects directly to emotional areas in the brain.

Body Senses

  • Touch and Pain: Mechanisms like nociceptors and endorphins.
  • Vestibular Sense: Balance and movement, utilizing feedback from head position changes.
  • Kinesthesis: Sensing individual body parts' positions.

Sensory Interaction and Synesthesia

  • Sensory Interaction: One sense influencing another (e.g., smell affecting taste).
  • Synesthesia: One sensory experience involuntarily triggers another sense (e.g., seeing colors when hearing music).