Hand Position Alters Vision by Modulating the Time Course of Spatial Frequency Use
Résumé
The nervous system gives preferential treatment to objects near the hands that are candidates for action.
It is not yet understood how this process is achieved. Here we show evidence for the mechanism that
underlies this process having used an experimental technique that maps the use of spatial frequencies
(SFs) during object recognition across time. We used this technique to replicate and characterize with
greater precision the coarse-to-fine SF sampling observed in previous studies. Then we show that the
visual processing of real-world objects near an observer’s hands is biased toward the use of low-SF
information, around 288 ms. Conversely, high-SF information presented around 113 ms impaired object
recognition when objects were presented near the hands. Notably, both of these effects happened
relatively late during object recognition and suggest that the modulation of SF use by hand position is at
least partly attentional in nature.