how to select with intersection?

I don't understand how to make an intersection selection.

I tried the following code with a 600 x 800 pixels document with a simple background layer:

var originalRulerUnits = app.preferences.rulerUnits; // valeur actuelle Ruler

app.preferences.rulerUnits = Units.PIXELS;

var originalTypeUnits = app.preferences.typeUnits; // valeur actuelle prefs

app.preferences.typeUnits = TypeUnits.PIXELS;

app.activeDocument.selection.selectAll();

// trying to select a 10px "frame"

app.activeDocument.selection.select([[10, 10], [10, 780], [580,780], [580, 10] ], SelectionType.INTERSECT);

No intersection is done, new selection replaces the existing one.

Thank you for your help.