Search found 5 matches

by vattha
Wed Aug 31, 2022 8:57 am
Forum: BioSemi Software (ActiView executable)
Topic: Almost all offsets are negative
Replies: 1
Views: 1785

Almost all offsets are negative

Hi All,

I have collected eeg with ActiveTwo for around 20 participants. All offsets are either positive or negative with approximately equal amount. But today, I found something unusual that is almost all offsets are negative, cf. the attachment. Is that usual?

Best,
Atthaphon
by vattha
Mon Aug 29, 2022 3:57 pm
Forum: BioSemi Hardware
Topic: Soak an electrode in salt water
Replies: 1
Views: 2237

Soak an electrode in salt water

Hi All,

Is it advisable to soak an electrode in salt water from time to time to keep it functioning?

Best, Atthaphon
by vattha
Sat Aug 27, 2022 7:27 am
Forum: BioSemi Software (ActiView executable)
Topic: line noise enter despite low impedance.
Replies: 1
Views: 2041

line noise enter despite low impedance.

Hi All, What I understood is that I should get the offset to be between +-20 mV to have a good quality signal. But I observed differently: see cp2, p2, and po4 in the attached figure. All three locations have stable offsets within the range but the corresponding signals are bad. Could somebody pleas...
by vattha
Sat Apr 23, 2022 5:51 am
Forum: BioSemi all other topics
Topic: Signa gel vs Elefix for GSR
Replies: 0
Views: 6352

Signa gel vs Elefix for GSR

Hi All,

A paper sheet from Biosemi recommends Elefix over Signal gel for GSR. May I know what could be a reason? Is it just only that Elefix provides better placement of GSR? Can I replace Elefix with Ten20?

Best,
Atthaphon Viriyopase
by vattha
Fri Feb 15, 2019 5:18 am
Forum: BioSemi Hardware
Topic: Necessary Equipment for Assembling a New EEG Lab
Replies: 2
Views: 11139

Re: Necessary Equipment for Assembling a New EEG Lab

I am about also to buy the same equipment. My questions might add some useful information to this topic. 1) In your website (https://www.biosemi.com/faq/prices.htm), you mentioned that the base system includes active electrodes. Are they Flat-Type Active-electrodes? How many of them will be included...