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Related Concept Videos

Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Sensory Perception: Organization of the Somatosensory System01:11

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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...
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Introduction to Special Senses01:26

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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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Perception of Sound Waves01:01

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Sensory Modalities01:15

Sensory Modalities

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Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
General senses refer to the broad category of sensory information detected by receptors in the body and can be further grouped into somatic and visceral senses. Somatic sensations include touch, pressure, temperature, and pain and are essential for navigating our environment and...
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Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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Related Experiment Video

Updated: Jan 10, 2026

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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"Definitely a toaster": Identifying container contents by touch and sound.

Mounia Ziat1, Grace Shim1, Rishika Mini Thulasi1

  • 1Bentley University, Waltham, MA, USA.

Perception
|November 25, 2025
PubMed
Summary
This summary is machine-generated.

Humans can identify the type of contents inside sealed containers by touch alone. This study shows surprising accuracy in qualitative judgments based on texture, size, and density, even without visual cues.

Keywords:
container contentscontainer hapticsobject identification

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Area of Science:

  • Human-Computer Interaction
  • Haptic Perception
  • Robotics

Background:

  • Prior research in container haptics focused on quantitative assessments (e.g., quantity, volume).
  • Limited exploration exists on the human capacity for qualitative content identification via touch.

Purpose of the Study:

  • To investigate if humans can determine the qualitative nature of contents within sealed containers using tactile exploration.
  • To assess the role of texture, size, and density in tactile object recognition.

Main Methods:

  • Participants explored sealed containers filled with various dry food items using only their sense of touch.
  • Experiments were conducted with and without auditory cues to isolate the haptic contribution.
  • Data collected on participants' ability to identify or describe the container contents.

Main Results:

  • Participants demonstrated a significant ability to identify or describe the contents based on tactile information.
  • Texture, size, and density were key discriminative features for content identification.
  • Performance was notable even without visual or auditory sensory input.

Conclusions:

  • The human hand possesses a sophisticated capacity for qualitative assessment of unseen objects through haptic perception.
  • Tactile exploration of containers can yield rich information about their contents, extending beyond simple quantitative measures.
  • Findings have implications for fields like robotics, accessibility, and human-computer interaction.