Looks good Empath, I'd consider trying to find a place for the medicine pool so you can get Aid Self. Since I got it I've been impressed at how good it is and I don't think I could do well at all now with it, especially in PvP. I'd also find more slots for Bone Smasher and TF.
I'd also try to get TK in earlier, maybe if you want to get mass hypnosis get that later and swop TK around.
I did mean to take TK earlier, but I didn't realy want it before I had stamina. I think I'll swap it with Power Blast, then I'll at least have it for Sirens Call.
6-slot terrify, really, it's one of your best powers, along with mass confusin and TK.
I'd whack a few more damage enhancements in Terrify; it does very respectable damage and cycles reasonably fast. Also, it wouldn't hurn to put a few more recharge things in Mass Hypsonis; it's not a hold, but it's still pretty useful.
Maybe swap those damage enhancements in your Domination-hold into hold durations? That was one thing that hit my eye 
"If you want damage, make a corruptor! Or a brute!" It's good to be different, if you like using damages instead of hold durations, be it, But I'd use hold durations instead.
I find the length is more than long enough, and the extra damage is very useful solo.
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Exported from Ver: 1.7.5.0 of the CoH_CoV Character Builder - (http://home.comcast.net/~SherkSilver/index.html)
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Name: Captain Cognitive
Level: 41
Archetype: Dominator
Primary: Mind Control
Secondary: Energy Assault
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01) --> Mesmerize==> Acc(1) Dmg(3) Dmg(3) Dmg(11) Rechg(13) Rechg(13)
01) --> Power Bolt==> Acc(1)
02) --> Dominate==> Acc(2) Dmg(5) Dmg(5) Dmg(7) Rechg(7) Hold(11)
04) --> Levitate==> Acc(4) Dmg(15) Dmg(15) Dmg(17)
06) --> Confuse==> Acc(6) ConfDur(17)
08) --> Mass Hypnosis==> Acc(8) Acc(9) Sleep(9)
10) --> Hasten==> Rechg(10) Rechg(34) Rechg(40)
12) --> Bone Smasher==> Acc(12) Dmg(23) Dmg(23)
14) --> Super Speed==> Run(14)
16) --> Power Boost==> Rechg(16) Rechg(40) Rechg(40)
18) --> Total Domination==> Acc(18) Acc(19) Rechg(19) Rechg(21) Hold(21) Hold(34)
20) --> Swift==> Run(20)
22) --> Hurdle==> Jump(22)
24) --> Stamina==> EndMod(24) EndMod(25) EndMod(25)
26) --> Terrify==> Acc(26) Acc(27) Dmg(27) Rechg(29) Rechg(31)
28) --> Total Focus==> Acc(28) Dmg(29) Dmg(31) Dmg(37)
30) --> Power Blast==> Acc(30) Dmg(31) Dmg(37) Dmg(37)
32) --> Mass Confusion==> Acc(32) Acc(33) Rechg(33) Rechg(33) ConfDur(34) Rechg(36)
35) --> Telekinesis==> EndRdx(35) EndRdx(36) EndRdx(36)
38) --> Power Burst==> Acc(38) Dmg(39) Dmg(39) Dmg(39)
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01) --> Sprint==> Empty(1)
01) --> Brawl==> Empty(1)
02) --> Rest==> Empty(2)
01) --> Domination==> Empty(1)
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Anyone have any comments?
Don't pay too much attention the levels of the slots at the moment, that'll probably change as I learn which powers I use and how.