Pantene & Suave Chemicals: Potential Neurological Risks - Research & Discussion

Question
I am a huge fan of Pantene, but today I heard something rather alarming.

Three of the chemicals contained in not only Pantene products, but Suave products as well, have been shown to be absorbed through the scalp and cause possible neurological damage.

The 3 chemicals are:

Methyl Tyrosinate HCl
Methylchloroisothiazolinone
Methylisothiazolinone

Any one have any more info? I'd really appriciate help in researching this claim.

Answer
You certainly wouldn't want to inject or swallow large amounts of these chemicals... the question is, can you absorb a significant amount through your scalp... The skin is usually a great barrier against these chemicals.  Overall, I don't think you will find any formal well done believable research that would show that simply washing your hair would cause neuro damage from shampoo