Cite as:
Nefs H T, Kappers A M L, Koenderink J J, 2001, "Amplitude and spatial-period discrimination in sinusoidal gratings by dynamic touch" Perception 30(10) 1263 – 1274
Download citation data in RIS format

Amplitude and spatial-period discrimination in sinusoidal gratings by dynamic touch

Harold T Nefs, Astrid M L Kappers, Jan J Koenderink

Received 22 March 2001, in revised form 26 July 2001

Abstract. We measured discrimination thresholds for sinusoidal gratings using active dynamic touch. In the first experiment we measured the thresholds for amplitude discrimination as a function of amplitude and spatial period. Thresholds ranged between 10.8% and 15.8% of the standard amplitude. We showed that amplitude differences as small as 2 μm can be detected. We found that Weber fractions for amplitude discrimination are constant over a range of amplitudes, but are influenced by the spatial period of the grating; discrimination improved with increasing spatial period. In the second experiment we determined the thresholds for spatial-period discrimination. We used the same design as in the first experiment. Weber fractions ranged from 6.4% to 11.8%. Amplitude was found to have no effect on the Weber fractions for spatial-period discrimination. However, the spatial period had an effect on the Weber fractions: larger spatial periods yielded lower Weber fractions.

Restricted material:

 Full-text PDF size: 290 Kb

 References  21 references, 5 with DOI links ()

Your computer (IP address: 184.73.74.47) has not been recognised as being on a network authorised to view the full text or references of this article. This content is part of our deep back archive. If you are a member of a university library that has a subscription to the journal, please contact your serials librarian (subscriptions information).