In section 3.0.7 we gave an example how to show a stimulus only a limited amount of time. Now we look at another example, where we measure time that participants need to solve a problem.
We assume that abc.gif is a layered image that starts with some blurry spots which gradually evolve into letters. Participants have to find which of the spots becomes the letter A.
<HTML>
<?
$sec=explode(" ",microtime());
$sec=$sec[0]+$sec[1];
echo "<BODY BGCOLOR=white>
<FORM METHOD=POST ACTION=$SCRIPT_NAME>\n";
if (! $SEC) {
echo "<CENTER>Click on the letter A!<BR>
<INPUT TYPE=IMAGE NAME=ABC ALT='.' SRC=abc.gif></CENTER><BR>
<INPUT TYPE=HIDDEN NAME=SEC VALUE=$sec>";
}
else {
$diff = $sec-$SEC;
echo "This took $diff seconds<BR>
Your coordinates were $ABC_x,$ABC_y";
}
?>
</FORM>
</BODY>
</HTML>