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Attentional Blink

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Submitted By Realesthitman
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Practicum Blok 2.4 Perceptie
Verslag 2: Resultaten
Attentional Blink

Voor ons experiment hebben we een ‘repeated measures ANOVA’ uitgevoerd. Hiervoor zijn de scores van de proefpersonen gebruikt van de ZAP ‘attentional blink’. De scores tonen het percentage aantal correcte letters die men reproduceert na het tonen van één of twee letters in de cijferreeks (zie appendix). Van tevoren verwachtten we hoe groter de afstand is tussen de aangeboden targetletters, hoe vaker de tweede letter wordt herkend. Tevens verwachtten we dat de aandacht voor de eerste targetletter interfereert met de tweede, waardoor het meer moeite kost om de tweede targetletter te reproduceren. Andersom verwachtten wij dit niet.
De resultaten van onze anova tonen aan dat er een significant verschil is tussen de scores van de proefpersonen op het reproduceren van de tweede letter (Target2). Het effect van de ‘Mauchly’s Test of Sphericity’ was niet significant (p = .803). Daarom kijken we naar ‘Sphericity Assumed’, welke een significant verschil toont, F(2, 18) = 37.109, p < .001. Om uit te vinden waar het verschil precies zit kijken we naar de ‘Bonferroni pairwise comparison’. Daarin zien we dat er een significant verschil is tussen de tweede conditie (Afstand3) en conditie 1 (Afstand1) en tussen conditie 2 (Afstand3) en conditie 3 (Afstand7). De proefpersonen identificeren in conditie 2 significant minder targetletter dan in condities 1 en 3. Tussen conditie 1 en conditie 3 is er geen significant verschil waardoor we kunnen stellen dat proefpersonen bij beide condities evenveel targetletters identificeren. Dit komt niet overeen met onze aanname dat hoe groter de afstand, hoe meer targetletters men kan identificeren. Wij hadden verwacht dat de proefpersonen bij conditie 2 significant beter zouden scoren dan bij conditie 1, ook hadden we verwacht dat de proefpersonen in conditie 3 significant beter zouden scoren dan in conditie 3. We denken een verklaring hiervoor is dat men bij Afstand1 de twee targetletters ziet als combinatie, waardoor ze allebei makkelijk gereproduceerd worden. Bij Afstand3 zit er te weinig tijd tussen de twee targetletters, minder dan 500 milliseconden, waardoor men moeite heeft met het reproduceren van de tweede targetletter. Tenslotte heeft men bij Afstand3 genoeg tijd om beide targetletters te identificeren.
Onze tweede verwachting was dat de tweede targetletters niet interfereren met het reproduceren van de eerste targetletter. Uit onze ‘repeated measures ANOVA’ blijkt dat er de eerste conditie significant later is dan conditie twee p = .004 en drie p = .001. Er is echter geen significant verschil aangetoond tussen conditie 2 en 3. Dit verschil zou kunnen duiden op interferentie van de tweede letter als beide letters snel na elkaar worden getoond (conditie1). Conditie vier (Één letter) hebben we buiten beschouwing gelaten omdat er geen tweede targetletter wordt getoond, welke dus ook niet kan interfereren. Bij het toetsen hebben we wederom aangenomen dat er sphericity was omdat de Mauchly’s test niet significant was.

Tabel 1
Gemiddelde per conditie voor Target1

| Mean | Target1 Afstand 1 | 61.500 | Target1 Afstand 3 | 84.000 | Target1 Afstand 7 | 83.500 | Target1 Één letter | 88.500 |

Tabel 2
Gemiddelden per conditie voor Target2

| Mean | Target2 Afstand 1 | 74.000 | Target2 Afstand 3 | 42.500 | Target2 Afstand 7 | 73.000 |

Appendix

proefpersoon | Target1 Afstand1 | Target1 Afstand3 | Target1 Afstand7 | Een letter | Target2 Afstand1 | Target2 Afstand3 | Target2 Afstand7 | 1 | 65 | 100 | 95 | 95 | 75 | 40 | 75 | 2 | 60 | 85 | 75 | 95 | 65 | 35 | 75 | 3 | 70 | 80 | 75 | 90 | 60 | 50 | 70 | 4 | 60 | 90 | 95 | 95 | 60 | 25 | 75 | 5 | 55 | 95 | 90 | 90 | 85 | 45 | 85 | 6 | 60 | 95 | 85 | 90 | 95 | 65 | 95 | 7 | 75 | 75 | 80 | 75 | 60 | 25 | 40 | 8 | 80 | 85 | 80 | 90 | 70 | 60 | 85 | 9 | 40 | 90 | 85 | 95 | 95 | 40 | 75 | 10 | 50 | 45 | 75 | 70 | 75 | 40 | 55 | | | | | | | | |
Tabel A1
Proefpersoon gemiddelden per conditie

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