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Today in a Nutshell

Today in a Nutshell. ACT-R 5.0? Cool. Christian Le(t-go-of-my-)biere dem buffers is where it’s at Mike the Hand-Eye Guy take this buffer and stuff it Dan the Man hey, you gotta problem with the environment??. Perceptions and Ramblings. Unification across architecture components!!

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Today in a Nutshell

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  1. Today in a Nutshell • ACT-R 5.0? Cool. • Christian Le(t-go-of-my-)biere • dem buffers is where it’s at • Mike the Hand-Eye Guy • take this buffer and stuff it • Dan the Man • hey, you gotta problem with the environment??

  2. Perceptions and Ramblings • Unification across architecture components!! • Parameter simplification!! • Potential to better model real-world tasks • Hmmmm… • is ACT-R a theory or a tool? • cumulative progress vs. scientific revolution? • why ACT-R? why a cognitive architecture? • Interesting… • PGSS started with ACT-R/PM!

  3. For the next issues of Glamour & GQ... What’s Hot What’s Not buffers stacks buffer stuffing production stuffing embodiment “time now” syntax sin-tax lightweight tools Interbook environment environment act.psy.cmu.edu www.vanilla-ice.com

  4. ACT-R 5.0 in the Real World • Seems well-suited (potentially) to handle real-world tasks • Work in progress to 6.0 • A few points of discussion…

  5. Perception • Visual-location vs. visual-object • two spotlights of attention?? • buffer stuffing start state !find-location! Encode !move-attention! object appears buffer “stuffed” then what?

  6. visual-location screen-x screen-y ... visual-object screen-x screen-y ... value visual-object screen-pos value ... Perception • Combined visual object

  7. Perception • Saliency map  what to attend, stuff, etc. • generalize to images, etc.

  8. buffer pool Multitasking • Q: How can ACT-R perform multiple tasks? • A/Q: What do other modules imply? • retrieval: set criteria, order by match score • goal: set criteria, order by priority

  9. Buffer Ordering Criteria buffer retrieval match score variables goal priority recency, etc. pool visual-object saliency left/right, etc. A Generalized View • Top-down processes dictate criteria (if any) • Bottom-up processes act on criteria (if any) • idle-time buffer stuffing for retrieval?? goal??

  10. Embodiment SIGNALS (e.g., video, sound) lower-level objects (e.g., lines/letters) Perception higher-level objects (e.g., words) ACT-R higher-level actions (e.g., say “hi”) lower-level actions (e.g., fixation location) Action SIGNALS (e.g., movement, speech)

  11. Individual Differences • Real-world industry cares aboutindividuals(’ money) • Sample differences: • age (young vs. old) • strategies (wander vs. ask) • personalities (passive vs. aggressive) • physical state (sleepy, drunk) • Hardware & software differences !!

  12. Education / Environment • Who is the user base? • psychologists? programmers? engineers? • Programming language • to most, LISP is dead • alternate versions? (non-ACT-R syntax?) • Environment is too heavyweight • Why write a cognitive model at all??? • Selling ACT-R is difficult and brand-name-ish;selling cognitive architectures works!

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