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188 <strong>Beeldschermkinderen</strong><br />
23 Valkenburg & Cantor, 2001; Rideout,<br />
Vandewater, & Wartella, 2003.<br />
24 Young, 1990.<br />
25 Anderson & Pempek, 2005; Valkenburg<br />
& Vroone, 2004.<br />
26 Acuff, 1997.<br />
27 Valkenburg & Hellendoorn, 1992.<br />
28 Wellman, 1990.<br />
29 Astington (1993).<br />
30 Parker, 1995.<br />
31 Davies, 1997.<br />
32 Carvey & Berndt (1977); in Astington<br />
(1993).<br />
33 Jaglom & Gardner, 1981.<br />
34 Harris, 2000.<br />
35 Bruner, 1966.<br />
36 Piaget, 1954.<br />
37 Howard, 1998.<br />
38 Anderson et al., 1986; Ruff & Lawson,<br />
1990.<br />
39 Rice et al., 1990.<br />
40 McGhee, 1979.<br />
41 Cohen, 1972; Siegler, 1998.<br />
42 Seiter, 1998.<br />
43 Davies et al., 2000; Seiter, 1998.<br />
44 Seiter, 1998.<br />
45 Acuff, 1997.<br />
46 Gunter et al., 1991.<br />
47 Mielke, 1983.<br />
48 Sheldon, 1998.<br />
49 Flavell et al., 1993.<br />
50 Flavell et al., 1993.<br />
51 Gunter et al., 1991.<br />
52 Flavell et al., 1993.<br />
53 Selman, 1980.<br />
54 Fernie, 1981; Hoffner & Cantor, 1991.<br />
55 Davies et al., 2000; Kellner, 1998.<br />
56 Hoffner & Cantor, 1991.<br />
57 Constanzo & Shaw, 1966.<br />
58 Mielke, 1983; Davies et al., 2000.<br />
59 Valkenburg & Cantor, 2001.<br />
60 Buijzen & Valkenburg, 2000b; Valken-<br />
burg & Soeters, 2001.<br />
61 Fagot, 1994; Goldstein, 1998.<br />
62 Leaper, 1994; Maccoby, 1988, 1990.<br />
63 O’Brien & Huston, 1985.<br />
64 Martin, 1994.<br />
65 Goldstein, 1998; James & McCain, 1982.<br />
66 Acuff, 1997.<br />
67 Hoffner & Cantor, 1991.<br />
68 Oliver & Green, 2001.<br />
69 Ullian, 1977.<br />
70 Livingstone & Bovill, 1999; Rosengren<br />
& Windahl, 1989.<br />
71 Valkenburg & Janssen, 1999.<br />
72 Hartman & Klimmt, 2006.<br />
73 Acuff, 1997; Heeter, 1988; Sanger et al.,<br />
1997; Valkenburg & Janssen, 1999.<br />
Hoofdstuk 3<br />
1 Wood et al., 1991.<br />
2 Bushman & Huesmann, 2006; Ander-<br />
son & Bushman, 2001; Paik & Com-<br />
stock, 1994; Sherry, 2001; Wood et al.,<br />
1991.<br />
3 Cohen, 1988.<br />
4 De mediaan is de middenscore van een<br />
variabele, het punt waarbij precies 50%<br />
van de scores lager of hoger ligt. Degenen<br />
die meer over deze eenvoudige en<br />
praktische omrekeningsmethode willen<br />
weten, verwijs ik naar Rosenthal en<br />
Rubin (1982).<br />
5 Bushman & Huesmann, 2001; McCart-