Thematic show Excerpt on Home/Blog

gistfile1.php

// show excerpt post instead of excerpt on homepage
function childtheme_thematic_content($content) {
    if ( is_front_page() || is_home() ) {
        $content= 'excerpt';
    }
    return $content;
}
add_filter('thematic_content', 'childtheme_thematic_content');