Abstract
Serial dependence effects have been observed using a variety of stimuli and tasks, revealing that the recent past can bias current percepts, leading to increased similarity between two. The aim of this study is to determine whether this temporal integration occurs in egocentric or allocentric coordinates. We asked participants to perform an orientation reproduction task using grating stimuli while the head was kept at a fixed position, or after a 40° yaw rotation between trials, from left (−20°) to right (+20°), putting the egocentric and allocentric cues in conflict. Under these conditions, allocentric cues prevailed.
Highlights
Perception depends on the stimuli impinging on our senses but is strongly conditioned by expectations and past perceptual experience
We show that serial dependence for orientation judgements is spatially selective in external, not retinal coordinates, reinforcing the notion that it is driven by the temporal continuity of the external world
Our results show that under the conditions of this experiment, where the head rotated about the yaw axis between trials to put allocentric and egocentric retinal signals in conflict, serial dependence was entirely allocentric, and as strong as when measurements were made with the head still
Summary
Perception depends on the stimuli impinging on our senses but is strongly conditioned by expectations and past perceptual experience. Orientation, numerosity and face perception—are systematically biased towards the recent perceptual experience (Cicchini et al, 2014, 2017; Fischer & Whitney, 2014; Liberman et al, 2014). This effect, known as serial dependence, probably reflects an optimisation strategy, where perceptual systems take advantage of temporal redundancies (the relative stability of the world) to improve signal to noise ratios and efficiency (Cicchini et al, 2018). We show that serial dependence for orientation judgements is spatially selective in external, not retinal coordinates, reinforcing the notion that it is driven by the temporal continuity of the external world
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