[Eeglablist] What type of monitor gives less noise in
the neuropsychology experiment?
geopilot at mindspring.com
Thu Jun 30 12:38:51 PDT 2005
CRT's give out TERRIBLE NOISE IN THE 60 and 30 HTZ RANGE. IF YOU DO ANY
LOW LEVEL RECORDING WITH THE MONITER ON IT WILL INTRODUCE SUCH A HUM
INTO ANY AMPLIFIED ELECTROMAGNETIC INPUT (including even microphones) AS
TO MAKE IT UNUSEABLE.
I have found I must turn the crt's off beofre recording and then back on
Additionaly some cellphones such as sidekicks and blue tooth devices
give off loud intermittent bursts of signals. Balckberrys treo and
sidekicks if within 2 feet of a car radio with actually be easily heard
in the car radio.
I think lcds are much lower however best is to eleimate all equipment
20ft from the area and turn off what you can't eliminate.
On Thu, 30 Jun 2005 9:57 am, Alexei A. Morozov wrote:
> Dear colleagues,
> Could you please give me an advice.
> I am going to automate a neuropsychology experiment.
> The visual stimulus will be demonstrated on the computer monitor.
> So, the question is what type of computer monitor
> produces less noise – LCD of CRT?
> I have read that TFT (LCD) monitor produces less noise, but it has
> the vertical scanning frequency 56 – 75 Hz, that intersects with
> the Gamma frequencies that we want to measure.
> Well, could anybody tell me please what type of monitor
> gives less noise in the neuropsychology experiment?
> Have anybody compared various types of computer monitors?
> Thank you,
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Typed from my mobile phone. Please excuse the typos!
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