cognition

1. Chapter 8: Language and
Thought

2. The Cognitive Revolution
• 19th Century focus on the mind
– Introspection
• Behaviorist focus on overt responses
– arguments regarding incomplete picture of
human functioning
• Empirical study of cognition – 1956
conference
– Simon and Newell – problem solving
– Chomsky – new model of language
– Miller – memory

3. Language: Turning Thoughts into Words
• Properties of Language
– Symbolic
– Semantic
– Generative
– Structured

4. The Hierarchical Structure of Language
• Phonemes = smallest speech units
– 100 possible, English – about 40
• Morphemes = smallest unit of meaning
– 50,000 in English, root words, prefixes,
suffixes
• Semantics = meaning of words and word
combinations
– Objects and actions to which words refer
• Syntax = a system of rules for arranging
words into sentences
– Different rules for different languages

5. Language Development: Milestones
• Initial vocalizations similar across languages
– Crying, cooing, babbling
• 6 months – babbling sounds begin to
resemble surrounding language
• 1 year – first word
– similar cross-culturally – words for parents
– receptive vs. expressive language

6. Table 8.2 Overview of Typical Language Development

7. Language Development:
Milestones Continued
• 18-24 months – vocabulary spurt
– fast mapping
– over and underextensions
• End of second year – combine words
– Telegraphic speech
– Mean Length of Utterance (MLU)
• End of third year – complex ideas, plural,
past tense
– Overregularization

8. Bilingualism:
Learning More Than One Language
• Research findings:
– Smaller vocabularies in one language,
combined vocabularies average
– Higher scores for middle-class bilingual
subjects on cognitive flexibility, analytical
reasoning, selective attention, and
metalinguistic awareness
– Slight disadvantage in terms of language
processing speed
– 2nd languages more easily acquired early
in life
– Greater acculturation facilitates acquisition

9. Figure 8.4 Age and second language learning

10. Can Animals Develop Language?
• Dolphins, sea lions, parrots, chimpanzees
– Vocal apparatus issue
– American Sign Language
• Allen and Beatrice Gardner (1969)
– Chimpanzee - Washoe
– 160 word vocabulary
• Sue Savage-Rumbaugh
– Bonobo chimpanzee - Kanzi
– Symbols
– Receptive language – 72% of 660 requests

11. Theories of Language Acquisition
• Behaviorist
– Skinner
• learning of specific verbal responses
• Nativist
– Chomsky
• learning the rules of language
• Language Acquisition Device (LAD)
• Interactionist
– Cognitive, social communication, and
emergentist theories

12. Figure 8.5 Interactionist theories of language acquisition

13. Problem Solving: Types of Problems
• Greeno (1978) – three basic classes
• Problems of inducing structure
– Series completion and analogy problems
• Problems of arrangement
– String problem and Anagrams
• Often solved through insight
• Problems of transformation
– Hobbits and orcs problem
– Water jar problem

14. Figure 8.6 Six standard problems used in studies of problem solving

15. Effective Problem Solving
• Well defined vs. ill defined problems
• Barriers to effective problem solving:
– Irrelevant Information
– Functional Fixedness
– Mental Set
– Unnecessary Constraints

16. Figure 8.12 The tower of Hanoi problem

17. Approaches to Problem Solving
• Algorithms
– Systematic trial-and-error
– Guaranteed solution
• Heuristics
– Shortcuts
– No guaranteed solution
• Forming subgoals
• Working backward
• Searching for analogies
• Changing the representation of a
problem

18. Figure 8.16 Representing the bird and train problem

19. Culture, Cognitive Style,
and Problem Solving
• Field dependence – relying on external
frames of reference
• Field independence – relying on internal
frames of reference
– Western cultures inspire field
independence
– Cultural influence based in ecological
demands
• Holistic vs. analytic cognitive styles

20. Decision Making:
Evaluating Alternatives and Making Choices
• Simon (1957) – theory of bounded rationality
• Making Choices
– Additive strategies
– Elimination by aspects
– Risky decision making
• Expected value
• Subjective utility
• Subjective probability

21. Table 8.3 Application of the additive model to choosing an apartment

22. Heuristics in Judging Probabilities
• The availability heuristic
• The representativeness heuristic
• The tendency to ignore base rates
• The conjunction fallacy
• The alternative outcomes effect

23. Figure 8.18 The conjunction fallacy

24. Understanding Pitfalls in Reasoning
About Decisions
• The gambler’s fallacy
• Overestimating the improbable
• Confirmation bias and belief perseverance
• The overconfidence effect
• Framing

25. Evolutionary Analyses: Flaws in Decision
Making and Fast and Frugal Heuristics
• Cosmides and Tooby (1996)
– Unrealistic standard of rationality
– Decision making evolved to handle real-
world adaptive problems
– Problem solving research based on
contrived, artificial problems
• Gigerenzer (2000)
– Quick and dirty heuristics
– Less than perfect but adaptive