mechanoreceptors II

Question 1

what determines the spatial form of an object

Answer 1

texture
shape
curvature

Question 2

why are SAII and FAII not good for resolving stimulus elements

Answer 2

large receptive fields

Question 3

humans discrimination threshold in finger

Answer 3

~1mm

Question 4

SA-I density

Answer 4

100/cm2 (1.0 mm spacing)

Question 5

FA-I density

Answer 5

150/cm2 (0.8 mm spacing)

Question 6

microneurography

Answer 6

measuring a neural image

Question 7

what can we conclude from the fact neural images for SAII and FAII are poor

Answer 7

that they are unlikely to underlie form perception

Question 8

evidence that SA-II & FA-II afferents are not the basis of form discrimination

Answer 8

• Large RFs
• Low spatial density in skin
• Neural images of braille characters are indistinct

Question 9

evidence that SAI afferents are sufficient for form discrimination

Answer 9

comes from electrophysiology- clear neural images detected

Question 10

what is keratin 8?

Answer 10

a marker for Merkel cells

Question 11

features of Ato1 CKO mice

Answer 11

lack merkel cells (SA1 afferents) in the skin

Question 12

evidence that SA-I afferents are necessary for form discrimination

Answer 12

Krt14; Atoh1 CKO female mice spend equal time on a rough and a smoot surface
in comparison wild type female rice spend more time on the rough surface than the smooth surface

Question 13

detection rate as a function of stimulus parameter

Answer 13

psychometric curve

Question 14

mount castle

Answer 14

vibration deter