Touch receptors are more densely packed in areas better at localising touch and some touch receptors are better at localising touch than others

Deeply located touch receptors are responsible for detecting and localising touch

Touch receptors are less crowded in areas better at localising touch and some touch receptors are better at localising touch than others

All touch receptors are good at localising touch in the most sensitive areas for touch

Touch receptors are less crowded in areas better at localising touch

Using the Jaeger eye charts

To test for peripheral vision

Using Snellen eye charts

To measure the size of the blind spot

In a dark room

sound pressure level relative to that for mean normal hearing at each frequency

sound pressure level relative to ambient sound levels

sound pressure level relative to 0 Newtons

sound pressure level relative to cultural norms

sound pressure level that is the lowest the person can hear

G

D

A

C

E

B

F

0 dB HL

120 dB SPL

20 kHz

20 microPascals

0 dB SPL