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Experimental Study on Context-Dependent Reinforcement Learning of Visuomotor Associations

Explore how context affects learning of visuomotor associations, analyzing object sequencing and statistical correlations. Experiment involves visual and motor responses with feedback. Results show situational influence on retention and relearning.

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Experimental Study on Context-Dependent Reinforcement Learning of Visuomotor Associations

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  1. TP 2: Situationsabhaengiges Verstaerkungslernen FNW/IBIO Jochen Braun, jochen.braun@nat.uni-magdeburg.de Oussama Hamid, oussama.hamid@nat.uni-magdeburg.de Roos Houtkamp, roos.houtkamp@nat.uni-magdeburg.de

  2. Experimenteller Teil: Dokumentiere Verstaerkungslernen visuomotorischer Assoziationen Dokumentiere Situationsabhaengigkeit Korreliere Reizstatistik mit Lernerfolg

  3. Visuelle Objekte • Fraktale Objekte sind • unvertraut • einpraegsam • unterscheidbar

  4. Motorische Assoziationen • Zwei motorische Antworten (links und rechts) • keine Assoziationen mit Objekten • Antwort durch Tastendruck • Verstaerkung durch Farbaenderung (gruen fuer ‘richtig’, rot fuer ‘falsch’)

  5. Erlernen Visuomotorischer Assoziationen Experimenter defines two lists of (arbitrary) target objects: members of first list call for response a (e.g., top, left), members of second list for response B (e.g., bottom, right). Naive subjects attempt to learn these associations by trial and error.

  6. Situationsabhaengikeit A 1st reversal 2nd reversal Zielreize Distraktor- reize ~60 Darbietungen Target and distractor objects reverse roles every 60 trials or so, necessitating relearning of visuomotor associations. Retention of initial visuomotor associations becomes evident after second reversal.

  7. Situationsabhaengigkeit B: Zeitliche Abfolge 0 1 1 1 0 1 1 1 1 0 0 1 1 1 0 1 1 1 0 2 1 0 0 0 1 0 2 0 0 2 1 Uebergaenge gleichverteilt Keine Wiederholungen Bestimmte Uebergaenge gehaeuft Einige Wiederholungen

  8. Unabhaengige Variablen • Haeufung der Uebergaenge • Zahl der Wiederholungen • Abhaengige Variablen • Lerngeschwindigkeit • Geschwindigkeit der Reakti- • vierung nach 2. Umkehr Lernmodell Objektsequenz, -statistik Nimitek

  9. Theoretischer Teil: Model of Yu & Dayan (2005) Erweiterung auf Situationsabhaengigkeit

  10. Uncertainty and Attention Angela Yu, Peter Dayan

  11. The Experiment • 5- Arrows • Trial: target after cue • Subject: report target • Block1: T-1 trials, blue is relevant, prediction probability:  • Block2: from trial T on, blue not relevant any more, for instance red with new 

  12. Mathematical Analysis

  13. The Ideal Learner Algorithm • Zt is the normalizing constant for the distribution • Iterative method for computing the joint posterior • Integration is expensive

  14. Erweiterung von Yu und Dayan 0 1 0 0 0 0.7 0 0 1 1 1 0 2 1 0 0 0 1 0 2 0 0 2 1 Bedeutsamkeit und Zuverlaessigkeit der Einzelobjekte Bedeutsamkeit und Zuverlaessigkeit der Objektuebergange

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