Oops!: DUAL task experiment

[Francisco José Tornay]

I'm sorry, I made a mistake when describing the procedure, I wrote:

>Procedure for SOA < stim1. It is a copy of the other procedure except for
>the following:
>
>Object 1) Stimulus 1 appears for an interval equals to SOA (whether fixed
>or varied by an attribute)
>Object 2) Stimulus 2 appears without deleting stimulus 1 (set background
>property to "transparent"      and make        sure both stimuli do not
>overlap, change the X and Y properties). This object   (textdisplay
>or         whatever) would remain for a period equal to SOA minus stim1
>duration).
>Object 3) Stimulus 2 remains on screen while stimulus 1 disappears
>         You can do this by presenting a new object, which would again
> present stim2  but deleting       the previous display (it would be a
> copy of the previous object but with the background         property set
> to "opaque").
>         This would last for a period equal to stim2 duration minus SOA.

  The last line is wrong, object 3 should last for a period equal to stim2
duration minus the duration of object 2.

The point is:
Object1 duration = SOA (stim1 appears alone)
Object1 duration + Object2 duration = stim1 duration (it is the period in
which stim1 stays on  screen, either alone or with stim2).
Object2 duration + Object3 duration = stim2 duration (Stim2 remains on
screen along both objects).

Francisco Tornay