1. Principles of Grouping & Pitch Theory By Kayla and Anika

2. What are The Principles of Grouping The Principles of grouping (or Gestalt laws of grouping ) are a set of principles in psychology. -First proposed by Gestalt psychologists as the reason that humans naturally perceive objects as organized patterns and objects -Principles exist because the mind has an innate disposition to perceive patterns in the stimulus based on certain rules. -Principles Catergories:Proximity, Similarity, Closure, Good Continuation, Common Fate, and Good Form.

3. Proximity The principle of proximity states that, all else being equal, perception tends to group stimuli that are close together as part of the same object. Stimuli that are far apart are seen as two separate objects.. The brain groups together the elements instead of processing a large number of smaller stimuli, allowing us to understand and conceptualize information more quickly.

4. Similarity The principle of similarity states that, all else being equal, perception lends itself to seeing stimuli that physically resemble each other as part of the same object. This allows for people to distinguish between adjacent and overlapping objects based on their visual texture and resemblance. Other stimuli that have different features are generally not perceived as part of the object. Our brain uses similarity to distinguish between objects who may lay adjacent to or overlap with each other based upon their visual texture.

5. Closure The principle of closure refers to the mind’s tendency to see complete figures or forms even if a picture is incomplete. This reaction stems from our mind’s natural tendency to recognize patterns that are familiar to us and thus fill in any information that may be missing. Closure is also thought to have evolved from ancestral survival instincts, if one was to partially see a predator their mind would automatically complete the picture and signal that it was a time to react to potential danger, even if not all the necessary information was available.

6. Good Continuation When there is an intersection between two or more objects, people tend to perceive each object as a single uninterrupted object. This allows differentiation of stimuli even when they come in visual overlap. We have a tendency to group and organize lines or curves that follow an established direction over those defined by sharp and abrupt changes in direction...

7. Common Fate When images are seen moving in the same direction at the same rate (optical flow), perception links the movement as part of the same stimulus. This allows people to make out moving objects even when other details are hidden. The law of common fate is used a lot in user interface design.

8. Good Form The principle of good form refers to the tendency to group together forms of similar shape, pattern, color, etc.

9. Example

10. Pitch Theory Place theory: First step to understanding pitch perception and how sounds come across How you hear things Accounts for sounds at or above 5,000hz

11. Hearing test

12. Frequency Theory: explains how people discriminate low-pitched sounds that have a frequency below 1000 Hz.  Impulses are sent at different rates Frequency theory of hearing can only account for sounds up to 5,000 hertz.