Millisecond Forums » Millisecond Forums » Inquisit 4 » How to define a position with absolute length units (e.g. pt & pc)

How to define a position with absolute length units (e.g. pt & pc)

Yat_Zoeng — Mon, 15 Jun 2020 12:27:27 GMT

Hi, everyone. I came across the problem of defining the position of a stimulus with absolute length scale. I need to set a picture right next to the fixxing point in the middle of the screen with a distance of 7° visual angle. So the picture is approxiamtely 13.55pc from the center. I wonder how I can actualize this position defination regardless of the screen size and resolution of the monitor.

RE: How to define a position with absolute length units (e.g. pt & pc)

Yat_Zoeng — Mon, 15 Jun 2020 12:27:27 GMT

+x[quote]

[b]Dave - 6/15/2020[/b]
+x[quote]

[b]Yat_Zoeng - 6/15/2020[/b]
+x[quote]

[b]Dave - 6/15/2020[/b]
+x[quote]

[b]Yat_Zoeng - 6/14/2020[/b]
Hi, everyone. I came across the problem of defining the position of a stimulus with absolute length scale. I need to set a picture right next to the fixxing point in the middle of the screen with a distance of 7° visual angle. So the picture is approxiamtely 13.55pc from the center. I wonder how I can actualize this position defination regardless of the screen size and resolution of the monitor.
[/quote]

Visual angle is dependent on the viewer's distance from the screen, so this is not answerable.
[/quote]
Yes. We assume that the sbjs are 50cm from the monitor, and that's 13.55pc*13.55pc for the stimulus under the requirement of 7°visual angle. That can be a fix value.

Thx for ur reply btw
[/quote]

Okay. Then see https://www.millisecond.com/forums/Topic14608.aspx for how to present stimuli at fixed physical sizes and/or at fixed physical positions.
[/quote]

Wow, that should be amazingly helpful. Thx a lot! :)

RE: How to define a position with absolute length units (e.g. pt & pc)

Dave — Mon, 15 Jun 2020 12:17:15 GMT

+x[quote]

[b]Yat_Zoeng - 6/15/2020[/b]
+x[quote]

[b]Dave - 6/15/2020[/b]
+x[quote]

[b]Yat_Zoeng - 6/14/2020[/b]
Hi, everyone. I came across the problem of defining the position of a stimulus with absolute length scale. I need to set a picture right next to the fixxing point in the middle of the screen with a distance of 7° visual angle. So the picture is approxiamtely 13.55pc from the center. I wonder how I can actualize this position defination regardless of the screen size and resolution of the monitor.
[/quote]

Visual angle is dependent on the viewer's distance from the screen, so this is not answerable.
[/quote]
Yes. We assume that the sbjs are 50cm from the monitor, and that's 13.55pc*13.55pc for the stimulus under the requirement of 7°visual angle. That can be a fix value.

Thx for ur reply btw
[/quote]

Okay. Then see https://www.millisecond.com/forums/Topic14608.aspx for how to present stimuli at fixed physical sizes and/or at fixed physical positions.

RE: How to define a position with absolute length units (e.g. pt & pc)

Yat_Zoeng — Mon, 15 Jun 2020 11:56:09 GMT

+x[quote]

[b]Dave - 6/15/2020[/b]
+x[quote]

[b]Yat_Zoeng - 6/14/2020[/b]
Hi, everyone. I came across the problem of defining the position of a stimulus with absolute length scale. I need to set a picture right next to the fixxing point in the middle of the screen with a distance of 7° visual angle. So the picture is approxiamtely 13.55pc from the center. I wonder how I can actualize this position defination regardless of the screen size and resolution of the monitor.
[/quote]

Visual angle is dependent on the viewer's distance from the screen, so this is not answerable.
[/quote]

Yes. We assume that the sbjs are 50cm from the monitor, and that's 13.55pc*13.55pc for the stimulus under the requirement of 7°visual angle. That can be a fix value.

Thx for ur reply btw

RE: How to define a position with absolute length units (e.g. pt & pc)

Dave — Mon, 15 Jun 2020 11:50:46 GMT

+x[quote]

[b]Yat_Zoeng - 6/14/2020[/b]
Hi, everyone. I came across the problem of defining the position of a stimulus with absolute length scale. I need to set a picture right next to the fixxing point in the middle of the screen with a distance of 7° visual angle. So the picture is approxiamtely 13.55pc from the center. I wonder how I can actualize this position defination regardless of the screen size and resolution of the monitor.
[/quote]

Visual angle is dependent on the viewer's distance from the screen, so this is not answerable.