The BioSemi headcap has been developed in cooperation with Dr. Peter Praamstra at the Behavioral Brain Sciences Center, University of Birmingham, United Kingdom. The headcap consists of an elastic cap with plastic, electrode holders. The cap itself does not contain electrodes. The cap is placed on the subject's head, and the electrode holders are filled with electrode gel with a syringe. Because of the active electrode setup, high electrode impedance's can be tolerated, so no skin preparation is required. Thus, the usual, unpleasant and time consuming scrubbing of the scalp after the paste is applied can be omitted. After the buttons are filled with paste, the active electrodes are plugged in the cap one by one. The procedure is fast and reliable (5-10 minutes for 32 channels), and allows high density EEG measurement with a minimum of preparation time and subject discomfort.  Caps with a , can be delivered straight from stock. The electrode position coordinates of standard BioSemi headcaps are downloadable. Since the electrode holders make the caps a little bit smaller, please order your caps half a size bigger. (so if you want a Medium cap, please order a Medium/Large cap). Standard, the caps have ear-slits for easy accessing of the ears. Surgical caps are available on demand. Different electrode layouts are possible on client specification. It is also possible to assemble your own cap layout. Caps are delivered complete with a 5" (12cm) velcro chin strap (7" strap is included starting from ML sizes). Information about infant head circumference sizes can be found on this page.
 
Available sizes:
 
Ordercode
(xx=Number of electrodes)
(yy=Labeling system)
Size
Available nr. of electrodes
Color
Head size displayed in cap
Standard stock
CAP INFA3 xx yy
Infa 3
16,32,64
Brown
34-38cm
 
CAP INFA2/3 xx yy
Infa 2/3
16,32,64
Pink/Brown
36-40cm
 
CAP INFA2 xx yy
Infa 2
16,32,64
Pink
38-42cm
 
CAP INFA1/2 xx yy
Infa 1/2
16,32,64
Light Blue/Pink
40-44cm
 
CAP INFA1 xx yy
Infa 1
16,32,64
Light Blue
42-46cm
 
CAP XSINFA1 xx yy
Extra Small/ Infa 1
16,32,64
Green/ Light Blue
44-48cm
 
CAP XS xx yy
Extra Small
16,32,64,128
Green
46-50cm
 
CAP SXS xx yy
Small/Extra Small
16,32,64,128
Yellow/Green
48-52cm
 
CAP S xx yy
Small
16,32,64,128,160
Yellow
50-54cm
CAP MS xx yy
Medium/Small
16,32,64,128,160
Red/Yellow
52-56cm
CAP M xx yy
Medium
16,32,64,128,160,256
Red
54-58cm
CAP ML xx yy
Medium/Large
16,32,64,128,160,256
Red/Blue
56-60cm
(ML is most popular size)
CAP L xx yy
Large
16,32,64,128,160,256
Blue
58-62cm
CAP LXL xx yy
Large/Extra Large
16,32,64,128,160,256
Blue/Brown
60-64cm
CAP XL xx yy
Extra Large
16,32,64,128,160,256
Brown
62-66cm
s
 
     
Available layouts:
Nr. of electrodes
Labeling system
Cap holders size
16
10/20 or ABC
17mm (Infant sizes use 14mm)
32
10/20 or ABC
17mm (Infant sizes use 14mm)
64
10/20 or ABC
17mm (Infant sizes use 14mm)
64
10/20 or ABC
17mm (Infant sizes use 14mm)
128
ABC
14mm
160
ABC
14mm
256
ABC
11mm
 
     
 
 

 

256 channels
Medium (Red)
ABC layout


 

160 channels
Medium (Red)
ABC layout


 

128 channels
Large (Blue)
ABC layout


 

64 channels Surgical
Medium/Small (Red/Yellow)
10/20 layout


 

64 channels
Medium (Red)
10/20 layout


 

32 channels
Large (Blue)
10/20 layout


 

16 channels
Medium/Large (Blue/Red)
10/20 layout