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A hug machine, also known as a hug box, a squeeze machine, or a squeeze box, is a deep-pressure device designed to calm hypersensitive persons, usually individuals with autism spectrum disorders. The therapeutic, stress-relieving device was invented by Temple Grandin while she was attending college.[1][2]

Autism has a profound effect upon social interactions and frequently co-occurrs with sensory processing disorder, which can cause hypersensitivity to sensory stimulation,[3] often making it uncomfortable or impractical for them to turn to other human beings for comfort. Grandin addressed this by designing the hug machine for sensory relief.

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The hug machine consists of two hinged side-boards, each four by three feet (120 cm by 90 cm) with thick soft padding, which form a V-shape, with a complex control box at one end and heavy-duty tubes leading to an air compressor. The user lies or squats, between the side-boards, for as long or short a period as desired. Using pressure exerted by the air compressor and controlled by the user, the side-boards apply deep pressure stimulation evenly across the lateral parts of the body.[4] The machine and its development are depicted in the biopicTemple Grandin.[5]


Cattle squeeze chutes, such as the portable one pictured here, were Grandin's inspiration for her hug machine.

As a young child, Grandin realized she would seek out deep pressure stimulation, but she felt over-stimulated when someone hugged or held her. The idea for the hug machine came to her during a visit to her aunt's Arizona ranch, where she noted the way cattle were confined in a squeeze chute for inoculation, and how some of the cattle immediately calmed down after pressure was administered.[6][7] She realized that the deep pressure from the chute had a calming effect on the cattle, and she decided that something similar might well settle down her own hypersensitivity.[6][7]

Initially, Grandin's device met with disapproval as psychologists at her college sought to confiscate her prototype hug machine.[2] Her science teacher, however, encouraged her to determine the reason it helped resolve the anxiety and sensory issues.


Several therapy programs in the United States now use hug machines, effectively achieving general calming effects among autistic people across the age spectrum. A 1995 study on the efficacy of Grandin's device, conducted by the Center for the Study of Autism, working with Willamette University in Salem, Oregon, involved ten autistic children and found a reduction in tension and anxiety.[8] Other studies, including one by Dr. Margaret Creedon, have yielded similar results. A small pilot study published in the American Journal of Occupational Therapy reported that the machine produced a significant reduction in tension, but only a small decrease in anxiety.[9] Some autism rights activists argue that hug machines, along with other forced sensory activities for autistic people, are cruel, ineffective and unethical.

Grandin continued to use her own hug box on a regular basis to provide the deep pressure necessary to relieve symptoms of her anxiety. 'I concentrate on how gently I can do it,' she has said. A paper Grandin wrote on her hug machine and the effects of deep pressure stimulation was published in the Journal of Child and Adolescent Psychopharmacology.[4]

In a February 2010 Time magazine interview, Grandin stated that she no longer uses a hug machine: 'It broke two years ago, and I never got around to fixing it. I'm into hugging people now.'[10]

Squeeze chair[edit]

For several years in the 1990s, urban interventionist/artist Wendy Jacob worked with Grandin in developing furniture that squeezes or 'hugs' users, inspired by Grandin's hug machine.[11][12]

Animal analogs[edit]

Several compression garments are available to treat noise phobia in dogs.

See also[edit]


  1. ^Grandin, Temple (1995). Thinking in Pictures: And Other Reports from My Life with Autism. New York: Doubleday. ISBN9780385477925.
  2. ^ abGrandin, Temple; Scariano, Margaret M. (1996). Emergence: Labeled Autistic. Grand Central Publishing. p. 91. ISBN9780446671828.
  3. ^Sicile-Kira, Chantal (2 March 2010). 'What Is Sensory Processing Disorder and How Is It Related to Autism?'. Psychology Today. Genesis Behavior Center Inc. Retrieved 29 July 2021.
  4. ^ abGrandin, Temple (Spring 1992). 'Calming Effects of Deep Touch Pressure in Patients with Autistic Disorder, College Students, and Animals'. Journal of Child and Adolescent Psychopharmacology. Mary Ann Liebert, Inc.2 (1): 63–72. doi:10.1089/cap.1992.2.63. PMID19630623. Retrieved April 14, 2019.
  5. ^Temple Grandin at IMDb
  6. ^ abGrandin, Temple; Johnson, Catherine (December 26, 2004). 'Animals in Translation'. The New York Times. ISSN0362-4331. Retrieved April 14, 2019.
  7. ^ abRaver, Anne (August 5, 1997). 'Qualities of an Animal Scientist: Cow's Eye View and Autism'. The New York Times. ISSN0362-4331. Retrieved April 14, 2019.
  8. ^Edelson, Ph.D., Stephen M. (December 6, 2009). 'Temple Grandin's Hug Machine'. Salem, Oregon: Center for the Study of Autism. Retrieved April 14, 2019.
  9. ^Edelson, Stephen M.; Edelson, Meredyth Goldberg; Kerr, David C. R.; Grandin, Temple (1999). 'Behavioral and Physiological Effects of Deep Pressure on Children With Autism: A Pilot Study Evaluating the Efficacy of Grandin's Hug Machine'. American Journal of Occupational Therapy. 53 (2): 145–152. doi:10.5014/ajot.53.2.145. PMID10200837.
  10. ^Wallis, Claudia (February 4, 2010). 'Temple Grandin on Temple Grandin'. Time Magazine. Retrieved April 14, 2019.
  11. ^Nikolovska, Lira; Ackermann, Edith; Cherubini, Mauro (2008). 'Exploratory Design, Augmented Furniture?'. In Dillenbourg, Pierre; Huang, Jeffrey; Cherubini, Mauro (eds.). Interactive Artifacts and Furniture Supporting Collaborative Work and Learning. Computer-Supported Collaborative Learning Series. 10. Springer. pp. 156–157. ISBN978-0387772349. Retrieved April 14, 2019.
  12. ^'The Squeeze Chair Project'. Wendy Jacob. Retrieved April 14, 2019.

External links[edit]

  • Dr. Temple Grandin's Webpage: Livestock Behaviour, Design of Facilities and Humane Slaughter (
  • Description and schematic details of the squeeze machine (
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Machine design is defined as the use of imagination, scientific principles and engineering techniques to create a machine or structure economically, in order to satisfy the requirements of a customer. Machine designis the first step involved in creation of a machine.

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Pages: 170

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Lesson 1. Introduction to machine design

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Lesson 4. Design for combined loading & theories of failure

Lesson 5. Stress concentration and creep

Lesson 6. Design for dynamic loading – i

Lesson 7. Design for dynamic loading – ii

Lesson 8. Design of knuckle joint

Lesson 9. Design of cotter joint

Lesson 10 introduction to welded joints

Lesson 11 design of welded joints

Lesson 12 introduction to threaded fastners

Lesson 13 design of threaded fastners

Lesson 14 design of shafts

Lesson 15 design of keys

Lesson 16 design of couplings

Lesson 17 springs

Lesson 18 leaf springs

Lesson 19 belts

Lesson 20 selection of belts

Lesson 21 flat belt pulleys

Lesson 22 gears

Lesson 23 design of spur gears

Lesson 24 design of spur gears-ii

Lesson 25 introduction to power screws

Lesson 26 design of power screws

Lesson 27 introduction to bearings

Lesson 28 selection of antifriction bearings

Lesson 29 design of levers

Lesson 30 design of columns

Lesson 31 design of thin cylindrical & spherical shells

Lesson 32 design of curved beams

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