The Role of Haptic Expectations in Reaching to Grasp: From Pantomime to Natural Grasps and Back Again
When we reach to pick up an object, our actions are effortlessly informed by the object’s spatial information, the position of our limbs, stored knowledge of the object’s material properties, and what we want to do with the object. A substantial body of evidence suggests that grasps are under the co...
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| Formato: | Artigo |
| Idioma: | English |
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Frontiers Media S.A.
2020-12-01
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| Colecção: | Frontiers in Psychology |
| Assuntos: | |
| Acesso em linha: | https://www.frontiersin.org/articles/10.3389/fpsyg.2020.588428/full |
| _version_ | 1831588579411755008 |
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| author | Robert L. Whitwell Nathan J. Katz Melvyn A. Goodale James T. Enns |
| author_facet | Robert L. Whitwell Nathan J. Katz Melvyn A. Goodale James T. Enns |
| author_sort | Robert L. Whitwell |
| collection | DOAJ |
| description | When we reach to pick up an object, our actions are effortlessly informed by the object’s spatial information, the position of our limbs, stored knowledge of the object’s material properties, and what we want to do with the object. A substantial body of evidence suggests that grasps are under the control of “automatic, unconscious” sensorimotor modules housed in the “dorsal stream” of the posterior parietal cortex. Visual online feedback has a strong effect on the hand’s in-flight grasp aperture. Previous work of ours exploited this effect to show that grasps are refractory to cued expectations for visual feedback. Nonetheless, when we reach out to pretend to grasp an object (pantomime grasp), our actions are performed with greater cognitive effort and they engage structures outside of the dorsal stream, including the ventral stream. Here we ask whether our previous finding would extend to cued expectations for haptic feedback. Our method involved a mirror apparatus that allowed participants to see a “virtual” target cylinder as a reflection in the mirror at the start of all trials. On “haptic feedback” trials, participants reached behind the mirror to grasp a size-matched cylinder, spatially coincident with the virtual one. On “no-haptic feedback” trials, participants reached behind the mirror and grasped into “thin air” because no cylinder was present. To manipulate haptic expectation, we organized the haptic conditions into blocked, alternating, and randomized schedules with and without verbal cues about the availability of haptic feedback. Replicating earlier work, we found the strongest haptic effects with the blocked schedules and the weakest effects in the randomized uncued schedule. Crucially, the haptic effects in the cued randomized schedule was intermediate. An analysis of the influence of the upcoming and immediately preceding haptic feedback condition in the cued and uncued random schedules showed that cuing the upcoming haptic condition shifted the haptic influence on grip aperture from the immediately preceding trial to the upcoming trial. These findings indicate that, unlike cues to the availability of visual feedback, participants take advantage of cues to the availability of haptic feedback, flexibly engaging pantomime, and natural modes of grasping to optimize the movement. |
| first_indexed | 2024-12-17T22:16:47Z |
| format | Article |
| id | doaj.art-5efeb06df38846a9b30b42447d3a6dec |
| institution | Directory Open Access Journal |
| issn | 1664-1078 |
| language | English |
| last_indexed | 2024-12-17T22:16:47Z |
| publishDate | 2020-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Psychology |
| spelling | doaj.art-5efeb06df38846a9b30b42447d3a6dec2022-12-21T21:30:35ZengFrontiers Media S.A.Frontiers in Psychology1664-10782020-12-011110.3389/fpsyg.2020.588428588428The Role of Haptic Expectations in Reaching to Grasp: From Pantomime to Natural Grasps and Back AgainRobert L. Whitwell0Nathan J. Katz1Melvyn A. Goodale2James T. Enns3Department of Psychology, The University of British Columbia, Vancouver, BC, CanadaDepartment of Psychology, Brain and Mind Institute, The University of Western Ontario, London, ON, CanadaDepartment of Psychology, Brain and Mind Institute, The University of Western Ontario, London, ON, CanadaDepartment of Psychology, The University of British Columbia, Vancouver, BC, CanadaWhen we reach to pick up an object, our actions are effortlessly informed by the object’s spatial information, the position of our limbs, stored knowledge of the object’s material properties, and what we want to do with the object. A substantial body of evidence suggests that grasps are under the control of “automatic, unconscious” sensorimotor modules housed in the “dorsal stream” of the posterior parietal cortex. Visual online feedback has a strong effect on the hand’s in-flight grasp aperture. Previous work of ours exploited this effect to show that grasps are refractory to cued expectations for visual feedback. Nonetheless, when we reach out to pretend to grasp an object (pantomime grasp), our actions are performed with greater cognitive effort and they engage structures outside of the dorsal stream, including the ventral stream. Here we ask whether our previous finding would extend to cued expectations for haptic feedback. Our method involved a mirror apparatus that allowed participants to see a “virtual” target cylinder as a reflection in the mirror at the start of all trials. On “haptic feedback” trials, participants reached behind the mirror to grasp a size-matched cylinder, spatially coincident with the virtual one. On “no-haptic feedback” trials, participants reached behind the mirror and grasped into “thin air” because no cylinder was present. To manipulate haptic expectation, we organized the haptic conditions into blocked, alternating, and randomized schedules with and without verbal cues about the availability of haptic feedback. Replicating earlier work, we found the strongest haptic effects with the blocked schedules and the weakest effects in the randomized uncued schedule. Crucially, the haptic effects in the cued randomized schedule was intermediate. An analysis of the influence of the upcoming and immediately preceding haptic feedback condition in the cued and uncued random schedules showed that cuing the upcoming haptic condition shifted the haptic influence on grip aperture from the immediately preceding trial to the upcoming trial. These findings indicate that, unlike cues to the availability of visual feedback, participants take advantage of cues to the availability of haptic feedback, flexibly engaging pantomime, and natural modes of grasping to optimize the movement.https://www.frontiersin.org/articles/10.3389/fpsyg.2020.588428/fullgraspingpantomimehaptic feedbackexpectationscognitive supervision |
| spellingShingle | Robert L. Whitwell Nathan J. Katz Melvyn A. Goodale James T. Enns The Role of Haptic Expectations in Reaching to Grasp: From Pantomime to Natural Grasps and Back Again Frontiers in Psychology grasping pantomime haptic feedback expectations cognitive supervision |
| title | The Role of Haptic Expectations in Reaching to Grasp: From Pantomime to Natural Grasps and Back Again |
| title_full | The Role of Haptic Expectations in Reaching to Grasp: From Pantomime to Natural Grasps and Back Again |
| title_fullStr | The Role of Haptic Expectations in Reaching to Grasp: From Pantomime to Natural Grasps and Back Again |
| title_full_unstemmed | The Role of Haptic Expectations in Reaching to Grasp: From Pantomime to Natural Grasps and Back Again |
| title_short | The Role of Haptic Expectations in Reaching to Grasp: From Pantomime to Natural Grasps and Back Again |
| title_sort | role of haptic expectations in reaching to grasp from pantomime to natural grasps and back again |
| topic | grasping pantomime haptic feedback expectations cognitive supervision |
| url | https://www.frontiersin.org/articles/10.3389/fpsyg.2020.588428/full |
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