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Sensory Perception: Organization of the Somatosensory System

Sensory Perception: Organization of the Somatosensory System

The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...

Somatosensation

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

Topographic Surveying and Contours

Topographic Surveying and Contours

Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...

Plotting of Topographic Maps

Plotting of Topographic Maps

Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...

Depth Perception and Spatial Vision

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

Methods of Obtaining Topography

Methods of Obtaining Topography

Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...

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Related Experiment Video

Updated: May 13, 2026

Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS)

Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS)

Published on: July 30, 2020

Exploration Strategies and Feature Prioritisation in Contour-based Haptic Perception of 2D Shape.

Lisa P Y Lin, Alap Kshirsagar, Boris Belousov

IEEE Transactions on Haptics

|May 11, 2026

Summary

This summary is machine-generated.

Touch perception uses active exploration strategies that adapt to object properties. Haptic shape perception flexibly adjusts exploratory procedures (EPs) based on material, prioritizing stable geometric cues like concavities.

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Area of Science:

Haptic perception
Cognitive psychology
Robotics and human-computer interaction

Background:

Touch perception is crucial for interacting with the physical world.
Active exploration strategies are key to haptic shape perception.
Understanding how material properties influence tactile exploration is important for designing intuitive interfaces.

Purpose of the Study:

To investigate how exploratory procedures (EPs) are organized in haptic shape perception.
To determine how material properties influence the selection of EPs and feature prioritization.
To examine the adaptive nature of haptic exploration in response to object properties.

Main Methods:

Two experiments involving participants exploring rigid and deformable shapes with a single finger.
Analysis of exploratory procedures (EPs), including contour-following, tapping, and scanning.
Measurement of trajectory and force data during exploration.
Temporal sequence analysis of movement patterns.

Main Results:

Contour-following was the dominant strategy, supplemented by other EPs for deformable shapes.
Concave regions were consistently prioritized across exploration parameters, irrespective of material.
Force application varied with material properties (more force for rigid, less for deformable).
Exploration movements were more fragmented for deformable shapes and smoother for rigid ones.

Conclusions:

Haptic shape perception is adaptive, with strategies adjusting to material contexts.
Exploration remains anchored by stable geometric cues, particularly concavities.
These findings support reliable shape perception across diverse material properties.