Week 13 Readings Flashcards
What is a category?
A set of entities that are equivalent in some way. Usually the items are similar to one another.
What is a concept?
The mental representation of a category.
How do concepts help in new situations?
Concepts allow people to identify objects, understand their purpose, and predict their use, even if the specific objects are unfamiliar.
Do animals have concepts?
Yes, animals have simpler concepts relevant to their lives, such as a squirrel’s concept of predators, but they lack the ability to understand complex concepts like humans do.
How does typicality influence category membership judgments?
Typical items are judged as category members more often than atypical ones (Hampton, 1979).
How does typicality affect the speed of categorization?
Categorization is faster for typical items compared to atypical ones (Rips, Shoben, & Smith, 1973).
Which members of a category are learned first?
Typical members are learned before atypical ones (Rosch & Mervis).
How does typicality affect learning a category?
Learning a category is easier when typical examples are provided (Mervis & Pani).
How does typicality impact language comprehension?
References to typical members are understood more easily in language comprehension (Garrod & Sanford, 1977).
How does typicality influence language production?
In language production, people tend to mention typical items before atypical ones (e.g., “apples and lemons” rather than “lemons and apples”) (Onishi, Murphy, & Bock, 2008).
What is the family resemblance theory by Rosch and Mervis (1975)?
It suggests that items are typical if they (a) have features frequent in the category and (b) lack features frequent in other categories.
Robins have features common among birds (e.g., flying, singing, nesting in trees) and lack features common in other categories, unlike penguins, which share features with fish (e.g., swimming).
What do the results of Rosch and Mervis’s experiments suggest about category learning and typicality?
Items with frequent category-specific features are learned faster and considered more typical, while shared features with other categories hinder learning.
What is the basic level of categorization?
It is the category level that is neither too specific nor too general, providing a “just right” level of specificity, such as “bear” instead of “northern brown bear” or “animal.”
What did Rosch et al. (1976) find when asking subjects to label pictures?
Most names provided were at the basic level (1,595 names), with only 14 being more specific (subordinate) and only one being more general (superordinate).
How does the frequency of basic-level labels, subordinate and superordinate labels compare in printed text?
Basic-level labels are much more frequent than both subordinate and superordinate labels (e.g., Wisniewski & Murphy, 1989).
Why is the basic level not universal?
It varies with culture, knowledge, and familiarity.
- Industrialized societies use broader terms (e.g., “tree”), while less industrialized ones use specifics (e.g., “elm”).
- Experts use more specific terms, like “sparrow” or “roofing hammer.”
- Categorization depends on knowledge, interests, and context.
Why are basic-level categories preferred?
They are more differentiated: members are similar to each other and distinct from other categories.
- Superordinate categories (e.g., “furniture”) are less useful because their members share few features.
- Subordinate categories (e.g., “desk chair”) are less distinct, making it harder to classify objects.
Experts have different knowledge, making subordinate categories more differentiated for them.
What is the main idea behind prototype theory?
It proposes that categories are represented by a general description or “prototype” with weighted features, and classification is based on how well an item matches these features.
Why are typical category members easier to classify in prototype theory?
They have more, highly weighted features that match the prototype closely.
How does exemplar theory differ from prototype theory?
Exemplar theory claims that categories are represented by memories of specific examples, not a summary representation.
New items are compared to stored exemplars, and similarity scores are calculated for each category. The category with the highest score is chosen.
What experimental evidence supports exemplar theory?
Studies show that people often rely on similarity to remembered items, even when it contradicts learned rules (e.g., Allen & Brooks, 1991).
What are the limitations of experiments supporting exemplar theory?
They often involve small sets of exemplars repeatedly studied, unlike real-world categorization.
Do researchers favor one theory over the other?
Many believe concepts involve multiple systems, combining prototypes, exemplars, and rules depending on context.
General descriptions (e.g., “dogs have four legs”), specific exemplars (e.g., family dog), and rules (e.g., a strike in baseball) can all contribute to categorization.
How does the knowledge approach to concepts differ from prototype and exemplar theories?
The knowledge approach emphasizes that concepts are informed by our understanding of real-world structures, using prior knowledge to learn and reason about new concepts, whereas prototype and exemplar theories focus only on descriptions or examples without such constraints.