Digital Commons Network^™

Bimanual Coupling In Left And Right Space: Which Hand Is Yoked To Which?, Gavin Buckingham, Gordon Binsted, David Carey

Gavin Buckingham

• Reaching across the body into contralateral space with one hand incurs a substantial cost on various measures of performance, compared to ipsilateral reaches of a similar amplitude (Carey, Hargreaves, & Goodale, 1996).

• When reaching with both hands, unimanual asymmetries disappear.

-The hands take off and land concurrently (Kelso, Southard, & Goodman, 1979).

• To test if this ‘yoking’ is driven by the left or the right hand, participants performed reaches of different amplitudes.

• These reaches were made to the left or right side of space.

-Further increasing the unimanual (baseline) asymmetries that get wiped out by the …

Input Vs. Output Level Coupling Demonstrates Asymmetrical Attentional Biases, Gavin Buckingham, David Carey

Gavin Buckingham

The current study examined the performance of each limb as it reached across the body (the hard task), while yoked to it’s ipsilateral reaching counterpart (the easy task).

Asymmetries In Attention Toward The Dominant Hand: Input Or Output?, Gavin Buckingham, Julie Main, David Carey

Gavin Buckingham

Peters (1981) suggested that an asymmetrical bias in attention (toward the right hand of right handers) could account for many manual asymmetries in bimanual task performance. Support for this notion comes from Honda (1982), who demonstrated preferential monitoring of the dominant hand during a bimanual reaching task, while Buckingham and Carey (2007) observed shorter refractory periods (dwell time in a bimanual discontinuous double-step reaching task) for the right hand.

Recent evidence may indicate an intentional (i.e. selection related behaviour – motor attention) bias toward the dominant hand (Bestelmeyer & Carey, 2004). The current study tests the hypothesis that the right …

Attentional Vs. Intentional Biases In Hand Movements; Hand-Specific Coupling & Bimanual Reaching, Gavin Buckingham, David Carey

Gavin Buckingham

Most of the population is dextral, showing a clear preference for performing the vast majority of tasks with their right hand. Peters (1981) suggested that an asymmetrical bias in attention (toward the right hand in right handers) could account for many manual asymmetries in bimanual task performance, with the left hand unable to perform the attentionally demanding portion of the task. Likewise, Honda (1982) demonstrated preferential monitoring of the dominant hand during a bimanual reaching task. Recent evidence has also shown an intentional (i.e. output related motor attention) bias toward the dominant hand (Bestelmeyer & Carey, 2004), another possible factor …

Reflections On… Phase Shifting Under Different Visual Conditions, Gavin Buckingham, David Carey, Arash Sahraie

Gavin Buckingham

When two limbs are moved out of time (i.e. opposing muscle activation at each limb) in rhythmic oscillatory movements, there is a tendency at high frequencies for the movements to synchronise in the temporal domain, resulting in bilateral homologous muscle activation known as a ‘phase shift’ (Kelso, 1984). In an effort to determine the degree with which perception influences this phase shifting behaviour (Mechsner et al., 2001), a mirror can be placed between the hands of participants, parallel to their mid-saggital plane such that the reflected hand appeared in the place of the occluded hand. This paradigm can be used …

Visual Adaptation To Masculine And Feminine Faces Influences Generalized Preferences And Perceptions Of Trustworthiness, Gavin Buckingham, L. Debruine, A. Little, L. Welling, C. Conway, B. Tiddeman, B. Jones

Gavin Buckingham

We compared the effects of adaptation to faces varying in sexual dimorphism of shape on perceptions of the trustworthiness and attractiveness of masculine faces.