A weakness of systematic desensitisation?

-Not effective for all treatmeant of phobias -Ohman suggests that SD might not be effective in treating phobias that have an underlying evolutionary survivial component. -Like people who have fear of heights or the dark, might not have been a phobia established through person experience (classical conditioning), making it hard to counter. -This highliths the limitation of SD, ineffective in treating phobias which might have an innate bias.