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THE COGNITIVE APPROACH

THE COGNITIVE APPROACH. TYPES OF PROCESSING. Areas of Study. Cognition is about internal processes that are often unobservable , e.g.: Perception, Attention, Memory, Visual Imagery, Language, Concept Learning, Reasoning

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THE COGNITIVE APPROACH

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  1. THE COGNITIVE APPROACH TYPES OF PROCESSING Adapted from http://psiexp.ss.udi.edu by E.Day

  2. Areas of Study • Cognition is about internal processes that are often unobservable, e.g.: Perception, Attention, Memory, Visual Imagery, Language, Concept Learning, Reasoning • Need converging evidence from different perspectives to really understand cognitive processes ? Adapted from http://psiexp.ss.udi.edu by E.Day

  3. Information Processing • Information processing models resemble processing in computers – made cognitive psychology popular • Information made available by the environment is processed by a series of processing systems • Processing system is a set of processes that work together to accomplish a type of task, using and producing representations as appropriate • The major goal of research is to specify these processes and representations Adapted from http://psiexp.ss.udi.edu by E.Day

  4. Types of Processing • Bottom-up processing. Processing directly affected by the stimulus input is usually described as stimulus‑driven or bottom‑up processing. • Top-down processing Processing. Processing is influenced by past experience and expectations . These influences constitute top‑down or conceptually driven processing. Adapted from http://psiexp.ss.udi.edu by E.Day

  5. Types of Processing • Serial processingIn serial processing, it is argues that each cognitive process is accessed in turn. (i.e. one process is completed before the next starts) • Parallel processingA very different possibility is that some or all of the processes involved in a cognitive task occur at the same time. This is known as parallel processing. • Parallel Distributed Processing (PDP)One problem with parallel processing is the idea that these processes operate simultaneously but independently of each other. In parallel distributed processing (PDP), cognitive processes operate at the same time and connections between them also influence the final outcome. This approach is also referred to as Connectionism. Adapted from http://psiexp.ss.udi.edu by E.Day

  6. Bottom Up Processing : An early version of the information-processing approach purely bottom up or stimulus-driven Adapted from http://psiexp.ss.udi.edu by E.Day

  7. A Demonstration of Top-Down Processing Adapted from http://psiexp.ss.udi.edu by E.Day

  8. Top-down processing: perception affected by knowledge of world Why do we seem to have a fairly robust interpretation of which shapes are concave and convex when the perceptual information is perfectly ambiguous? -> perception affected by knowledge Adapted from http://psiexp.ss.udi.edu by E.Day (Kleffner & Ramachandran, ’92)

  9. Sound Induced Illusory Flashes • Example of parallel and interactive processing: visual perception affected by auditory perception • http://www.cns.atr.jp/~kmtn/soundInducedIllusoryFlash2/ Adapted from http://psiexp.ss.udi.edu by E.Day

  10. Top-down processingLater stages of processing affect earlier stages can explain effects of Knowledge, memory, expectations and context Adapted from http://psiexp.ss.udi.edu by E.Day

  11. Serial, Parallel and PDP Processing • To illustrate the differences between serial, parallel and parallel distributed processing, consider the Sternberg task • Goal: what steps are involved in comparing information to memory? How long do these steps take? • Task: • give subjects memory sets. E.g. 3 9 7 • Probe memory with targets and foil digits: 9 = “yes”, 6=“no”. Measure reaction time. • Vary the size of these memory sets Adapted from http://psiexp.ss.udi.edu by E.Day

  12. Typical Sternberg Results • Plot reaction time as function of memory set size and type of trial (targets/foils) • What are the implications of seeing a linear increase in reaction time as a function of memory set? Adapted from http://psiexp.ss.udi.edu by E.Day

  13. A serial information processing model for Sternberg task Make Decision Is it a 7? Perceive Stimulus Is it a 3? Is it a 9? yes 9 This serial information processing model predicts a linear increase Adapted from http://psiexp.ss.udi.edu by E.Day

  14. A parallel information processing model for Sternberg task Is it a 3? Perceive Stimulus 9 Make Decision Is it a 9? yes Is it a 7? This parallel information processing model also predicts a linear increase Adapted from http://psiexp.ss.udi.edu by E.Day

  15. A parallel distributed information processing model for Sternberg task Is it a 3? Perceive Stimulus 9 Is it a 9? Make Decision yes Is it a 7? What is the difference between this model and the Parallel model of processing????? Adapted from http://psiexp.ss.udi.edu by E.Day

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