They may not be able to activate commands that require multiple keystrokes simultaneously. They may need longer response times when dealing with interactive forms on Web sites. If an individual's muscles are tense and contracted, or if an individual has problems with coordination or involuntary movements, it may affect their ability to select keys on the keyboard or targets on a Web page. If an individual's vocal chords are affected by a physical disability, he or she may have difficulty producing speech that is recognizable by some voice recognition software. Some specific learning disabilities can affect ability to focus.
Some individuals learn more slowly or have difficulty understanding complex concepts.
Avoidance of these visual or audio frequencies in Web sites prevents inadvertent triggering of seizures. Examples include impairments in vision, hearing, memory, or dexterity, any of which can affect an individual's ability to access Web content, however together these conditions can be more complex to accommodate. For example, someone with low vision may need screen magnification, however one loses some surrounding contextual information when using screen magnification, which may further hinder an individual who also has limited short-term memory. Barriers can include any of the issues already mentioned above. The following is a list of assistive technologies that some people with disabilities use to browse the Web.