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SUMMARY:Perceptual learning across saccades: Feature but not location spec
 ific - Ivan Tomic
DTSTART:20231023T130000Z
DTEND:20231023T140000Z
UID:TALK207706@talks.cam.ac.uk
CONTACT:Adam Triabhall
DESCRIPTION:This week we will discuss and debate a very recent paper by Gr
 zeczkowki and colleagues\, published in PNAS (2023).\n\nAbstract: “Perce
 ptual learning is the ability to enhance perception through practice. The 
 hallmark of perceptual learning is its specificity for the trained locatio
 n and stimulus features\, such as orientation. For example\, training in d
 iscriminating a grating’s orientation improves performance only at the t
 rained location but not in other untrained locations. Perceptual learning 
 has mostly been studied using stimuli presented briefly while observers ma
 intained gaze at one location. However\, in everyday life\, stimuli are ac
 tively explored through eye movements\, which results in successive projec
 tions of the same stimulus at different retinal locations. Here\, we studi
 ed perceptual learning of orientation discrimination across saccades. Obse
 rvers were trained to saccade to a peripheral grating and to discriminate 
 its orientation change that occurred during the saccade. The results showe
 d that training led to transsaccadic perceptual learning (TPL) and perform
 ance improvements which did not generalize to an untrained orientation. Re
 markably\, however\, for the trained orientation\, we found a complete tra
 nsfer of TPL to the untrained location in the opposite hemifield suggestin
 g high flexibility of reference frame encoding in TPL. Three control exper
 iments in which participants were trained without saccades did not show su
 ch transfer\, confirming that the location transfer was contingent upon ey
 e movements. Moreover\, performance at the trained location\, but not at t
 he untrained location\, was also improved in an untrained fixation task. O
 ur results suggest that TPL has both\, a location-specific component that 
 occurs before the eye movement and a saccade-related component that involv
 es location generalization” (Grzeczkowski et al.\, 2023).\n\nReference: 
 Grzeczkowski\, L. Shi\, Z.\, Rolfs\, M.\, & Deubel\, H. (2023). Perceptual
  learning across saccades: Feature but not location specific. PNAS\, 120(4
 3). https://doi.org/10.1073/pnas.2303763120
LOCATION:Zoom link: www.bayslab.org/craikjc
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