Dataset Information

The effect of active hand movement on visually perceived depth direction.

ABSTRACT: This study investigated the effect of active hand movement on the perception of 3-D depth change. In Experiment 1, the 3-D height of an object synchronously changed with the participant's hand movement, but the 3-D height of the object was incongruent with the distance moved by the hand. The results showed no effect of active hand movement on perceived depth. This was inconsistent with the results of a previous study conducted in a similar setting with passive hand movement. It was speculated that this contradiction appeared because the conflict between the distance moved by the hand and visual depth changes were more easily detected in the active movement situation. Therefore, it was assumed that in a condition where this conflict was hard to detect, active hand movement might affect visual depth perception. To examine this hypothesis, Experiment 2 examined whether information from hand movement would resolve the ambiguity in the depth direction of a shaded visual shape. In this experiment, the distance moved by the hand could (logically) accord with either of two depth directions (concave or convex). Moreover, the discrepancy in the distances between visual and haptic perception could be ambiguous because shading cues are unreliable in estimating absolute depth. The results showed that perceived depth directions were affected by the direction of active hand movement, thus supporting the hypothesis. Based on these results, simulations based on a causal inference model were performed, and it was found that these simulations could replicate the qualitative aspects of the experimental results.

SUBMITTER: Umemura H

PROVIDER: S-EPMC7787534 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature

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The effect of active hand movement on visually perceived depth direction.

Umemura Hiroyuki H

PloS one 20210106 1

This study investigated the effect of active hand movement on the perception of 3-D depth change. In Experiment 1, the 3-D height of an object synchronously changed with the participant's hand movement, but the 3-D height of the object was incongruent with the distance moved by the hand. The results showed no effect of active hand movement on perceived depth. This was inconsistent with the results of a previous study conducted in a similar setting with passive hand movement. It was speculated th ...[more]

PMID: 33406157

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Project description:Reaching behavior represents one of the basic aspects of human cognitive abilities important for the interaction with the environment. Reaching movements towards visual objects are controlled by mechanisms based on coordinate systems that transform the spatial information of target location into appropriate motor response. Although recent works have extensively studied the encoding of target position for reaching in three-dimensional space at behavioral level, the combined analysis of reach errors and movement variability has so far been investigated by few studies. Here we did so by testing 12 healthy participants in an experiment where reaching targets were presented at different depths and directions in foveal and peripheral viewing conditions. Each participant executed a memory-guided task in which he/she had to reach the memorized position of the target. A combination of vector and gradient analysis, novel for behavioral data, was applied to analyze patterns of reach errors for different combinations of eye/target positions. The results showed reach error patterns based on both eye- and space-centered coordinate systems: in depth more biased towards a space-centered representation and in direction mixed between space- and eye-centered representation. We calculated movement variability to describe different trajectory strategies adopted by participants while reaching to the different eye/target configurations tested. In direction, the distribution of variability between configurations that shared the same eye/target relative configuration was different, whereas in configurations that shared the same spatial position of targets, it was similar. In depth, the variability showed more similar distributions in both pairs of eye/target configurations tested. These results suggest that reaching movements executed in geometries that require hand and eye dissociations in direction and depth showed multiple coordinate systems and different trajectory strategies according to eye/target configurations and the two dimensions of space.

Dataset Information

The effect of active hand movement on visually perceived depth direction.

Publications

The effect of active hand movement on visually perceived depth direction.

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